JP2002319258A - Method for evaluating flying characteristics of slider and program for analyzing flying characteristics of slider - Google Patents

Abstract

(57) [Summary] [Problem] It is possible to analyze the surface roughness of a recording medium, the surface run-out, and the impact resistance due to drop, impact, etc., to converge the calculation more quickly, and to calculate an accurate gap parameter. Provide a way that can be. SOLUTION: The shape of the surface of the slider which should face the recording medium, the gap parameter between the slider and the recording medium, the load applied to the slider, and the relative speed between the slider and the recording medium are described. The flying characteristics of the slider are evaluated based on the stiffness distribution and the damping distribution calculated for the gas film in the gap between the surface of the slider facing the recording medium and the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for evaluating the flying characteristics of a slider of a disk drive using a flying head such as a magnetic head, an optical head, or a magneto-optical head, and a program for analyzing the flying characteristics of a slider.

[0002]

2. Description of the Related Art A conventional method for evaluating the flying characteristics of a slider in a disk drive will be described by taking the method for evaluating the flying characteristics of a slider in a magnetic disk device as an example.

Conventionally, when determining the shape of a surface of a slider on which a magnetic head of a floating type magnetic disk device is to be opposed to a magnetic recording medium, the shape of a surface to be opposed to the magnetic recording medium is determined during operation of the magnetic disk device, The flying characteristics of the sliders have been evaluated based on the results of analysis on a computer using an analysis program (for example, CMLAir developed by UC Berkeley has been put to practical use as an analysis program). ).

[0004] Such a conventional program for analyzing the flying characteristics of a slider will be described with reference to the drawings.

FIG. 8 is a flowchart showing an analysis step in a conventional slider flying characteristic analysis program.

In FIG. 8, first, in step S100, shape data of a surface of a slider to be analyzed which is to face a magnetic recording medium is input to a computer.

The input is performed by inputting three-dimensional coordinate data created by CAD or the like as it is, or by simply converting the shape input on a computer screen with a mouse or the like into three-dimensional coordinate data. You.

In step S100, an initial flying height h is determined to determine a gap between the slider and the magnetic recording medium.
₀ , input of gap parameters such as a roll angle and a pitch angle, a load F ₀ which is an urging force applied to the slider by the support arm of the head support device, and a relative speed between the slider and the magnetic recording medium, The input of the number of rotations of the recording medium and the position of the slider is simultaneously performed.

Next, in step S101, the slider should face the magnetic recording medium based on the shape data of the surface, the gap parameter, the load, and the relative speed between the slider and the magnetic recording medium input in step S100. The pressure distribution of the air film between the surface and the magnetic recording medium is calculated.

The calculation of the pressure distribution is performed by solving the Reynolds equation.

Next, in step S101, an initial flying force f ₀ of the slider is calculated by integrating the calculated pressure distribution.

Next, in step S102, the load F ₀ given in step S100 and the load
The balance of the initial levitation force f ₀ calculated in 101 is determined.

If the absolute value of the difference between F ₀ and f ₀ is a predetermined value (for example, a value of about 10 ⁻⁷ ,
If it is smaller than R in FIG.
Proceed to 110.

Also, F₀And f₀The absolute value of the difference from
If it is larger than the predetermined value, step S1
03, the initial flying height h₀Flying height with small changes
h₀’, And in step S104, the step
Flying height h defined in S103 ₀’
Pressure distribution and levitation force f
₀’.

Next, in step S105, as in step S102, the balance between F ₀ and f ₀ ′ is determined.

If the absolute value of the difference between F ₀ and f ₀ ′ is smaller than a predetermined value, step S
Proceed to 110.

If the absolute value of the difference between F ₀ and f ₀ ′ is larger than a predetermined value, step S
Proceeding to 106, assuming that the air film between the surface of the slider that should face the magnetic recording medium and the magnetic recording medium is a rigid spring,
The spring coefficient k is calculated from the following equation.

K = Δf / Δh = (f ₀ ′ −f ₀ ) / (h ₀ ′ −h ₀ ) Next, in step S107, the flying height h ₁ is calculated using the spring coefficient k calculated in step S106. It is calculated from the following equation.

H ₁ = k (F ₀ −f ₀ ) + h _{0 In} step S 108, the flying height is calculated using the value of h ₁ calculated in step S 107 in the same manner as in step S 101 or step S 104. based on h _1, to calculate the pressure distribution and the levitation force f ₁ generated in the air layer between the surface and the magnetic recording medium facing the magnetic recording medium of the slider.

Next, in step S109, the load F
To determine the balance between ₀ and f _1, if, when the absolute value of the difference between F ₀ and f ₁ is smaller than the predetermined value (referred to as R in FIG. 8), the step S110 Proceed to
In step S110, to output as the flying height of the slider should be evaluated h _1, and ends.

In step S109, the load F
To determine the balance between ₀ and f _1, if, when the absolute value of the difference between F ₀ and f ₁ is greater than the predetermined value (referred to as R in FIG. 8), the step S107 Back to
Spring coefficient k is used as the calculated value in step S106, it is calculated from the following equation the flying height h _2.

[0022] _{h 2 = k (F 0 -f} 1) + h 1 below, in order to perform the step S108 and step S109, in step S109, to determine the balance between F ₀ and f _2, F ₀ and f ₂ If the absolute value of the difference from the above is larger than a predetermined value (denoted by R in FIG. 8), steps S107, S108, and S109 are repeatedly executed, and in step S109, F ₀ and f _{The process} is repeated until the absolute value of the difference from _n becomes smaller than a predetermined value (R in FIG. 8).

In step S109, F ₀
Absolute value of the difference between the f _n is, when converged less than the predetermined value, the process proceeds to step S110,
as the flying height of the slider to be evaluated the h _n, and output,
finish.

[0024]

In the above-described conventional method for analyzing the flying characteristics of a slider and the program thereof, when the value of the flying height is converged, the value is calculated from the initial flying height of the slider. Calculation was repeated with the fixed spring coefficient fixed, that is, assuming a rigid body spring.
In general, the air spring coefficient k is represented by a non-linear function represented by the flying height h, so that the flying height obtained by the analysis does not match the actual flying height of the slider, and the value of the flying height does not easily converge. There was a problem that.

Further, in the conventional slider flying characteristic analysis method and program, only one value of the spring coefficient k, which is a rigidity coefficient, is calculated for each slider shape, that is, the position of the center of gravity of the slider and the magnetic recording. It was analyzed that one rigid spring was located between the medium and the medium.

However, in actuality, since the surface of the slider facing the magnetic recording medium is not flat, the flying height from the magnetic recording medium varies depending on the position of the slider surface. Different. That is, the slider is supported by the plurality of air springs and is floating.

Since this is not taken into account in the conventional method, the analysis result is a factor that differs from the actual slider behavior, for example, the flying height.

On the other hand, in a recent magnetic disk device, since the recording density of the magnetic disk has been dramatically improved, the flying height when the slider flies from the magnetic recording medium is extremely large as compared with the related art. It is often as small as several tens of nm or less, for example, about 10 to 25 nm.

When the flying height is reduced as described above, the influence of disturbance such as the surface roughness of the magnetic recording medium and the run-out of the magnetic recording medium during rotation on the slider behavior is significantly higher than in the prior art. However, in the conventional method for evaluating the flying characteristics of the slider as described above, the influence of these disturbances cannot be analyzed and evaluated, and the flying amount obtained by the analysis and the actual behavior of the slider are different. There was a problem that.

First, the conventional method does not consider the attenuation coefficient required for analyzing the influence of the disturbance in a relatively high frequency region, for example, the surface roughness of the magnetic recording medium on the slider behavior. , Could not be calculated.

Also, recent personal computers, mobile phones, PDAs
Due to the miniaturization and mobileization of portable information devices such as magnetic disk drives, magnetic disk devices, which are an important data storage means, must have a further reduction in size and have high shock resistance against vibration, drop, etc. For example, high portability is required.

For this purpose, the flying characteristics of the slider are analyzed,
In the evaluation, it is necessary to evaluate a disturbance in a relatively low frequency region, that is, an impact resistance against a surface runout or a drop of the magnetic recording medium during rotation, but in the conventional method, such a disturbance is required. However, there was a problem that analysis and evaluation could not be performed.

In view of the above problems, the present invention can analyze the surface roughness and runout of a magnetic recording medium, and the impact resistance due to dropping, impact, etc., and more quickly converge the required flying height. It is another object of the present invention to provide a slider flying characteristic evaluation method capable of obtaining accurate flying characteristics, and a program therefor.

[0034]

SUMMARY OF THE INVENTION A method for evaluating the flying characteristics of a slider according to the present invention comprises the steps of: determining the shape of the surface of the slider facing the recording medium; the parameters of the gap between the slider and the recording medium; Evaluating the flying characteristics of a slider based on a stiffness distribution and a damping distribution calculated for a gas film in a gap between a surface of the slider facing the recording medium and the recording medium based on a relative speed between the slider and the recording medium. It is characterized by.

As a result, vibration from the outside, run-out,
Analysis of the flying characteristics of the slider in consideration of disturbances such as the surface roughness of the magnetic recording medium can be realized.

Further, by calculating the stiffness distribution and the damping distribution based on the perturbation method, the stiffness distribution and the damping distribution can be calculated more easily.

Further, the program for analyzing the flying characteristics of a slider according to the present invention provides a computer with information on the shape of the surface of the slider which should face the recording medium, the clearance parameter between the slider and the recording medium, the load applied to the slider, and the like. A first step of inputting a relative speed between the slider and the recording medium;
A second step of calculating a pressure distribution generated in a gas film in a gap between the surface of the slider facing the recording medium and the recording medium; a third step of calculating a flying force of the slider from the pressure distribution; In a fourth step of determining the balance with the levitation force, and in the fourth step, when the load and the levitation force are not balanced, a stiffness coefficient is obtained, a new levitation amount is calculated from the stiffness coefficient, In the fifth step and the fourth step, when the load and the levitation force are balanced, the gap parameter at that time and the fifth step
A sixth step of outputting the rigidity distribution and the attenuation distribution of the gas film in the gap between the recording medium and the surface of the slider which should face the recording medium, calculated in the step.

Thus, it is possible to provide a program that can realize the slider flying characteristic evaluation method of the present invention.

In the fifth step, the stiffness distribution and the damping distribution are obtained by the perturbation method.
The rigidity distribution and the damping distribution can be calculated more easily.

According to the recording medium on which such a program is recorded, the program can be executed without depending on the terminal.

[0041]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) As a first embodiment, a program for analyzing the flying characteristics of a slider according to the present invention will be described.

As shown in FIG. 7, the slider flying characteristic analysis program of the present invention includes at least an input device 7 such as a mouse and a keyboard, a CPU 8, a storage device 9 such as a memory and a disk device, and a display device and a printer. Arithmetic unit 11 (for example, computer) including output unit 10
Run on

Next, a specific processing process for each step will be described with reference to a flowchart shown in FIG. 1 by taking as an example a case where a flying height is obtained as a gap parameter.

In FIG. 1, first, in step S10, a surface of the slider to be analyzed which is to be opposed to the magnetic recording medium (hereinafter referred to as an ABS (Air Bearing Su)
rface)) is input to the CPU 8.

For the input, three-dimensional shape data of the ABS surface created in advance by CAD or the like may be input from the storage device 9, or may be simply input on the output device 10 of the arithmetic unit using the input device 7. Data converted into three-dimensional coordinates of the ABS surface shape created by drawing may be input to the CPU 8.

FIG. 2 shows an example of the ABS surface shape of the slider 1 to be analyzed as an example of step S10. FIG. 2A is a plan view thereof, and FIG. 2B is a perspective view thereof.

In FIG. 2, when the magnetic disk device is operating, that is, when the magnetic recording medium is rotating, an air flow flows into the slider 1 to be analyzed from the direction of the arrow W due to the rotation of the magnetic recording medium.

As shown in FIGS. 2A and 2B, the ABS surface of the slider 1 has a flat step surface 2, a rail surface 6 for generating a positive pressure, and a negative pressure. It has a recessed surface 3 to be formed and a pad surface 4 on which the magnetic head 5 is to be mounted.

Next, actual analysis steps will be described again with reference to FIG.

In step S10, the above AB
The gap parameter between the slider and the magnetic recording medium together with the shape of the S surface is input to the CPU 8 from the input device 7.

[0052] Note that the gap parameter, for example the initial flying height h _0, the roll angle theta _0, the pitch angle [psi ₀ etc., the initial attitude of the slider 1 with respect to the magnetic recording medium is a parameter for determining the position.

In step S10, the data of the load applied from the support arm to the slider 1 to be analyzed in the direction approaching the magnetic recording medium is also input from the input device 7 to the CPU 8.

Here, the load data is, for example, data of a load magnitude F ₀ and a position where the load is applied.

Further, in step S10, as basic conditions for the analysis, the elevation, air clay, the rotation speed and speed of the spindle motor of the magnetic disk drive, the position of the slider on the magnetic recording medium, the skew angle, the magnetic head in the slider The information such as the position where the is mounted, the magnitude and shape of the surface roughness of the magnetic recording medium is also input from the input device 7, or the data input in advance is stored in the storage device 9 from the CP.
Input to U8.

Next, in step S20, the CPU
8, the pressure distribution of the air film between the ABS surface and the magnetic recording medium surface is calculated based on the Reynolds equation using the parameters input in step S10 (for the Reynolds equation, for example, O. Reynol is used).
ds, "On the Theory of Lubr
application and it's Applicati
on to Mr. BEACHAMP TOWER
's Experiments, Inclusion
an Experimental Determinator
Tion of Viscosity of O
live Oil, Phil. Trans. , 177
(1886), 157. As shown in

As a result, as shown in FIG. 3, the distribution of the pressure generated in the air film between the ABS of the slider and the magnetic recording medium is calculated and displayed on the output device 10.

Thus, the pressure distribution according to the shape of the ABS can be calculated and evaluated.

Next, returning to FIG. 1, in step S30, by integrating the pressure distribution calculated in step S20, the flying force f _{0 of the} slider to be analyzed is obtained.
Is calculated in the CPU 8.

Next, at step S40,
Lifting force f calculated in S30 ₀And step S1
Load F input at 0₀Balance with CPU8
Is determined. Specifically, the floating force f₀And load F₀
The absolute value of the difference from the predetermined value (for example, 10
^-7It is determined whether the value is within the value of the degree).

As a result of the balance determination in step S40, if it is determined that the balance is obtained, the process proceeds to step S50, and if it is determined that the balance is not obtained, the process proceeds to step S70.

In step S70, the CPU 8
The operation using the perturbation method is performed. First, the ABS of the slider 1 is calculated using the parameters input in step S10.
A complex rigid pressure distribution G on the surface is determined.

The method of obtaining the complex rigid pressure, rigidity coefficient and damping coefficient of the slider using the perturbation method is described in Keio Ono,
"Following characteristics of floating head slider in submicron region", Transactions of the Japan Society of Mechanical Engineers (C), 5
March 4th, Vol. 45, No. 391, p. 356-362 and Yasunaga Miya, et al., "Perturbation method for dynamic molecular gas lubrication problem considering surface roughness by FEM", Transactions of the Japan Society of Mechanical Engineers (C edition), July 1995, No. 61 Vol. 587
p. 434-442.

Next, the complex stiffness pressure distribution G is integrated, and the real part thereof is calculated as the initial value k ₀ of the stiffness coefficient.

The real part of the calculated complex stiffness pressure distribution G is defined as the stiffness distribution K on the ABS of the slider 1.
The imaginary part is stored as the attenuation distribution C in the storage device 9 inside the arithmetic unit 11.

Next, in step S 71, the flying height h ₁ of the slider is calculated in the CPU 8 using the initial value k ₀ of the stiffness coefficient calculated in step S 70, and the result is stored in the storage device 9. The calculation is performed based on the following equation.

H ₁ = k ₀ (F ₀ −f ₀ ) + h ₀ (1) Next, the process returns to step S20, and is again analyzed using the flying height h ₁ of the slider calculated in step S71. The pressure distribution on the ABS of the slider is calculated.

Then, in step S30, the levitation force f ₂ is calculated, and then, in step S40,
A lift force f ₂ calculated in step S30, the balance is determined with the load F ₀ input in step S10. Specifically, it is determined whether or not the absolute value of the difference between the levitation force f ₂ and the load F ₀ is within a preset value (for example, a value of about 10 ⁻⁷ ).

Next, in step S40, as a result of the balance determination, if it is determined that the balance is obtained, the process proceeds to step S50, and if it is determined that the balance is not obtained, the process proceeds to step S70.

As described above, in step S40, the balance between the lifting force f _n and the load F ₀ is determined, and this loop is repeated until the balance is achieved.

Next, in step S40, if it is determined that the balance is obtained, the process proceeds to step S40.
In 50, and outputs the h _n stored in the storage device 9 as the value of the flying height of the slider 1 to be analyzed.

According to the slider flying characteristic analysis program of the present invention, the calculation is performed by changing the stiffness coefficient k each time the calculation is performed, so that the number of convergences of the calculation is about half that of the conventional analysis program.

In this embodiment, the method of determining the rigidity coefficient k in the parallel mode from the initial flying height f ₀ and calculating the final flying height h _n has been described. in floating characteristic evaluation program, Similarly, the pitch mode, from the initial pitch angle theta _0, performs the calculation of the stiffness coefficient k _theta pitch mode, and calculates a final pitch angle theta _n.

[0074 In this case, equation _{(1), θ 1 = k θ0 (M} θ0 -m θ0) + θ 0 (2) next, while converging the value of k _theta using a perturbation method, the final pitch angle theta _n can be calculated (M _θ0 indicates the load moment in the pitch direction, and m _θ0 indicates the lift moment in the pitch direction).

Similarly, also in the roll mode, from the initial pitch angle ｋ ₀ , the roll mode rigidity coefficient k _{用 い} is calculated using the moment in the roll direction, and the final roll angle ψ _n can be calculated. .

As described above, the gap distribution H (x, y) between the slider and the disk is determined by the parallel mode h _n , the pitch mode θ _n, and the roll mode ψ _n .

H (x, y) = f (h _n , θ _n , ψ _n ) (3) Further, after executing step S 50, step S 6
0, when step S70 is executed last,
The values of the stiffness coefficient K and the damping coefficient C stored in the storage device 9 are called, and the stiffness distribution K and the stiffness distribution K as shown in FIG. 4A and FIG. Further, an attenuation distribution C as shown in FIG.

By using the slider flying characteristic analysis program of the present invention, the stiffness distribution K and the damping distribution C can be calculated. In addition to calculating the flying height, pitch angle, and roll angle for the magnetic recording medium,
This makes it possible to evaluate impact resistance, which was not possible before.

Next, the evaluation of the impact resistance will be described with reference to actual examples.

FIGS. 4 and 5 are diagrams showing an example of a calculation result obtained by analyzing the ABS surface shown in FIG. 2 as an analysis target.

FIGS. 4 (a) and 5 (a) show the stiffness distribution and the damping distribution, respectively, when the frequency is set to 75 Hz when the calculation is performed by the perturbation method.

FIGS. 4 (b) and 5 (b) show that the frequency at the time of performing the operation by the perturbation method is 1000, respectively.
3 shows a stiffness distribution and a damping distribution when Hz is set.

The frequency of 75 Hz is an example of a frequency when a relatively low-frequency disturbance applied to the magnetic disk device, for example, a run-out due to a manufacturing variation in mounting the magnetic recording medium to the spindle motor is assumed. It is.

For example, in a magnetic recording medium that rotates at 4500 rpm, the run-out frequency is obtained by the following equation.

4500 (rpm) / 60 (s / min)
= 75 (Hz) In addition, the influence of external vibration due to the drop of the magnetic disk device or the like can be clarified by evaluating the analysis result when a vibration of a lower frequency is applied. .

The frequency of 1000 Hz means that
This is an example of a frequency assuming a relatively high-frequency disturbance, for example, a disturbance applied to a slider due to surface roughness, undulation, etc. on a recording surface of a magnetic recording medium.

According to the slider flying characteristic analysis method of the present invention, it is possible to evaluate and predict the flying characteristics of various sliders.

For example, first, in FIG. 4A, in a region A where a negative pressure is generated in the pressure distribution of FIG.
Looking at the rigidity distribution, it can be seen that there is almost no change in the rigidity coefficient.

This indicates a so-called negative pressure saturation phenomenon. Even if a portion where a negative pressure is generated is formed, the air film rigidity between the ABS surface and the magnetic recording medium surface has a good effect or a bad effect. It turns out that it does not give. On the other hand, in a region where a positive pressure is generated, a positive stiffness coefficient is calculated. In order to design a highly rigid ABS surface against relatively low-frequency disturbance, a high pressure distribution is required. It can be seen that it is necessary to perform a design having the above.

Next, in FIG. 4B, the rigidity distribution on the ABS surface when a relatively high frequency disturbance is applied shows that the rigidity is slightly increased in the region B.

This is the same as the step surface 2 in FIG. 2. This step surface 2 is a portion designed so as to have a wide flat portion so as to have a so-called squeeze effect. It can be seen that this appears slightly when there is a relatively high frequency disturbance.

Next, the result of studying the result of the attenuation distribution will be described.

First, in the distribution of the damping coefficient with respect to the relatively low-frequency vibration shown in FIG. 5A, a very large value is not calculated except for the pad portion provided with the magnetic head.

This indicates that the influence of the damping coefficient is small for low-frequency vibration.

On the other hand, when looking at the distribution of the damping coefficient for the relatively high frequency vibration shown in FIG. 5B, it can be seen that the damping distribution has a negative value in the region C.

The region where the attenuation distribution has a negative value is a region corresponding to the region C in FIG. 2A. Seems to be the cause.

When such a region having a negative damping coefficient exists, the behavior of the slider becomes unstable when a relatively high frequency disturbance such as the influence of surface roughness at the time of flying occurs, etc. It can be seen that there is a high possibility that the slider will collide with the magnetic recording medium.

In fact, when the ABS-shaped slider shown in FIG. 2 was experimentally manufactured and tested, it was found that the slider exhibited unstable behavior during flying and collided with the magnetic recording medium.

As described above, according to the slider flying characteristic evaluation method of the present invention, the following advantages are obtained by obtaining the gap parameters such as the flying height using the perturbation method.

First, since the calculation is performed by changing the stiffness coefficient k each time the calculation is performed, the number of convergences of the calculation is about half that of the conventional analysis program.

Further, the rigidity distribution and the damping distribution on the ABS can be easily calculated by obtaining the gap parameters such as the flying height using the perturbation method.

Further, according to the slider flying characteristic evaluation method of the present invention, the slider flying characteristic is more compared with the case where the analysis is performed by the conventional method.
A gap parameter such as a flying height closer to the experimental value can be calculated.

FIG. 6 shows a comparison between the flying height obtained as a result of analyzing the flying characteristics of a slider having a certain ABS shape and the measured value.

As shown in FIG. 6, the measured value 22.6 (n
m), the flying height analyzed and calculated by the conventional method is 1
7.7 (nm), the flying height calculated by the slider flying characteristic analysis program of the present invention is 24.7 (nm).
And a value closer to the actually measured value could be calculated.

In the embodiment of the present invention, a method of evaluating the flying characteristics of a slider of a magnetic disk device using a magnetic head and a program using the same have been described. The same effect can be obtained when the method is used as a method for evaluating the flying characteristics of a slider of a disk recording / reproducing device of the type, for example, an optical disk device or a magneto-optical disk device, and a program using the same.

[0106]

As described above, the method for evaluating the flying characteristics of a slider according to the present invention and the program using the same can be used to improve the surface roughness of a recording medium, the surface runout, and the impact resistance due to dropping, impact, and the like. And a program for evaluating the flying characteristics of the slider, which can converge the calculation more quickly and calculate an accurate gap parameter, can be provided.

[Brief description of the drawings]

FIG. 1 is a flowchart showing steps of a slider flying characteristic analysis program according to a first embodiment of the present invention;

FIG. 2A is a plan view showing an ABS surface shape of a slider to be analyzed according to the first embodiment of the present invention; FIG.

FIG. 3 is a diagram showing a pressure distribution generated on an ABS of a slider to be analyzed according to the first embodiment of the present invention;

FIG. 4 is a diagram showing a distribution of rigidity generated on an ABS of a slider to be analyzed according to the first embodiment of the present invention;

FIG. 5 is a diagram illustrating an attenuation distribution generated on an ABS of a slider to be analyzed according to the first embodiment of the present invention;

FIG. 6 is a diagram comparing an analysis result of a flying height and an actually measured value according to the first embodiment of the present invention;

FIG. 7 is a block diagram showing a configuration of an arithmetic unit according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing steps of a conventional slider flying characteristic analysis program.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slider 2 Step surface 3 Recess surface 4 Pad surface 5 Magnetic head 6 Rail surface 7 Input device 8 CPU 9 Storage device 10 Output device 11 Arithmetic device S10-S110 Step

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tatsuhiko Inagaki 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D059 AA01 BA01 CA30 DA35 EA02 EA20

Claims (5)

[Claims] 1. A shape of a surface of a slider which is to face a recording medium, a gap parameter between the slider and the recording medium, a load applied to the slider, and a relative speed between the slider and the recording medium. Flying height of the slider is evaluated by a rigidity distribution and a damping distribution calculated for a gas film in a gap between the surface of the slider facing the recording medium and the recording medium based on the slider. Characteristic evaluation method. 2. The method according to claim 1, wherein the calculation of the stiffness distribution and the attenuation distribution is performed based on a perturbation method. 3. A computer, comprising: a shape of a surface of a slider facing a recording medium; a gap parameter between the slider and the recording medium; a load applied to the slider; A first step of inputting a relative velocity, a second step of calculating a pressure distribution generated in a gas film in a gap between the surface of the slider facing the recording medium and the recording medium, and the pressure distribution A third step of calculating the flying force of the slider
And a fourth step of determining a balance between the load and the floating force. In the fourth step, when the load and the floating force are not balanced, a rigidity coefficient is obtained, and the rigidity coefficient is determined. Calculating a gap parameter newly from the fifth step, and returning to the second step, in the fourth step, when the load and the floating force are balanced, the gap parameter at that time, Executing a sixth step of outputting the rigidity distribution and the attenuation distribution of the gas film in the gap between the surface of the slider facing the recording medium and the recording medium, calculated in the fifth step. A slider flying characteristic analysis program characterized by the following. 4. The program according to claim 3, wherein in the fifth step, the stiffness distribution and the attenuation distribution are obtained by a perturbation method. 5. A computer-readable recording medium on which the program for analyzing flying characteristics of a slider according to claim 3 or 4 is recorded.