JP2008276902A - Perpendicular magnetic recording head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a perpendicular magnetic recording head capable of improving a write-in capability without causing any pole lock-up. <P>SOLUTION: The perpendicular magnetic recording head has a main magnetic pole layer having a pole straight part exposed at an opposing plane to a recording medium and a flared part expanded to the track width direction forward a height direction interior side from the pole straight part, and an auxiliary yoke layer that overlaps the main magnetic pole layer as viewed in a top view and is magnetically coupled to the main magnetic pole layer, the auxiliary yoke layer has flared part that broadens from the recording medium opposing surface to the track width direction, the flared part of the auxiliary yoke is disposed at a position located closer to the rear side in the height direction of the flared part of the main magnetic pole layer, The flared part of the main magnetic pole layer is formed at a flare angle greater than a flare angle of the auxiliary yoke layer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a perpendicular magnetic recording head that performs a recording operation by applying a perpendicular magnetic field to a recording medium.

  As is well known, a perpendicular magnetic recording head has a main magnetic pole layer and a return path layer which are laminated on a surface facing a recording medium with a nonmagnetic layer interposed therebetween, and applies a recording magnetic field to the main magnetic pole layer and the return path layer. And a coil layer. The area of the main magnetic pole layer exposed on the surface facing the recording medium is sufficiently smaller than the same area of the return path layer, and the main magnetic pole layer and the return path layer are magnetically connected on the back side in the height direction. The main magnetic pole layer has a pole straight portion exposed on the surface facing the recording medium and a flare portion in contact with the depth direction rear side of the pole straight portion so that a strong recording magnetic field can be locally applied to the recording medium. have. When the coil layer is energized, a recording magnetic field is induced between the main magnetic pole layer and the return path layer, and this recording magnetic field is perpendicularly incident on the hard film of the recording medium from the tip surface exposed on the medium facing surface of the main magnetic pole layer, It returns to the return path layer through the soft film of the recording medium. As a result, magnetic recording is performed at a portion facing the main magnetic pole layer.

In the perpendicular magnetic recording head, in order to improve the recording density and prevent the occurrence of fringing at the time of skew, the pole straight portion (the portion exposed to the medium facing surface) of the main magnetic pole layer formed on the nonmagnetic layer is It has been proposed that the shape seen from the medium facing surface side is a trapezoidal shape (bevel shape) that becomes narrower on the nonmagnetic insulating layer side (Patent Documents 1 and 2). However, in a perpendicular magnetic recording head, when the write current is not applied, the magnetic domain of the main magnetic pole layer and the auxiliary yoke layer is perpendicular to the recording medium, so that the data recorded on the recording medium is erased. The phenomenon will occur. As a method for preventing this pole lockup phenomenon, a method has been proposed in which the trailing side surface of the pole tip of the main magnetic pole layer is asymmetric with respect to the track center (Patent Document 3).
JP 2002-197611 A Japanese Patent Laid-Open No. 2003-242608 JP 2006-323899 A

  However, if the pole tip has an asymmetric shape, the left and right magnetic field strength and distribution with respect to the track center will be uneven.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to obtain a perpendicular magnetic recording head that can achieve an improvement in writing ability without causing a pole lockup.

  The present invention that solves such a problem includes a main magnetic pole layer having a pole straight portion exposed on a surface facing a recording medium, and a flare portion extending in the track width direction from the pole straight portion toward the depth direction in the height direction, and A perpendicular magnetic recording head comprising an auxiliary yoke layer that overlaps and is magnetically connected to the main magnetic pole layer in plan view, the auxiliary yoke layer from the surface facing the recording medium toward the back in the height direction A flare portion extending in the track width direction, wherein the flare portion of the auxiliary yoke layer is located on the deeper side in the height direction than the flare portion of the main magnetic pole layer, and the flare angle of the flare portion of the main magnetic pole layer has the flare angle It is characterized by being formed at an angle larger than the flare angle of the layer.

  The flare angle of the auxiliary yoke layer is preferably 45 ° or more and less than 70 °.

  In the perpendicular magnetic recording head of the present invention, the flare portion of the main magnetic pole layer is connected to the pole straight portion, and the first flare portion that extends in the track width direction at the first flare angle toward the depth direction rear side. And a second flare portion that is connected to the first flare portion and that extends in the track width direction at the second flare angle toward the back in the height direction, the second flare angle of the auxiliary yoke layer It is characterized by being larger than the flare angle. Furthermore, it is preferable that the first flare angle is smaller than the second flare angle and not more than the flare angle of the auxiliary yoke layer.

The perpendicular magnetic recording head of the present invention has a return path layer laminated on the main magnetic pole layer with a nonmagnetic layer sandwiched between the surface facing the recording medium, and the main magnetic pole layer is located on the back side in the height direction. And a base portion formed integrally with the pole straight portion and the flare portion of the main magnetic pole layer, and the auxiliary yoke layer is formed integrally with the flare portion of the auxiliary yoke layer toward the back in the height direction. Preferably, the width of the base portion of the auxiliary yoke layer in the track width direction is wider than the width of the base portion of the main magnetic pole layer in the track width direction.
Further, it is more preferable that 1.5 × W1 ≦ W2 is satisfied, where W1 is the width of the base of the main magnetic pole layer and W2 is the width of the base of the auxiliary yoke layer.

According to the present invention, the flare angle of the main magnetic pole layer is made larger than the flare angle of the auxiliary yoke layer, so that the magnetic flux is efficiently collected at the tip of the main magnetic pole layer, and the writing ability is greatly improved to increase the recording density. A perpendicular magnetic recording head that can be achieved can be obtained.
According to the third aspect of the present invention, since the second flare angle of the main magnetic pole layer is larger than the first flare angle, the magnetic pole can be efficiently transferred to the main magnetic pole while preventing pole lockup which is inadvertent writing by the magnetic domain control. The writing ability from the tip of the main magnetic pole layer can be improved by gathering at the tip of the layer.
According to the fifth aspect of the present invention, since the facing area where leakage magnetic flux is generated from the main magnetic pole layer to the return path layer is reduced, the loss of magnetic flux is reduced and the recording ability is improved.

  The present invention will be described with reference to the accompanying drawings. In each figure, the X direction is the track width direction, the Y direction is the height direction, and the Z direction is the stacking direction of the layers constituting the perpendicular magnetic recording head H, and is defined as the moving direction of the recording medium M.

FIG. 1 is a partial sectional view showing a laminated structure of a perpendicular magnetic recording head H according to an embodiment of the present invention as viewed from the track width direction. The perpendicular magnetic recording head H has a reproducing part R and a recording part W formed by laminating thin films on the trailing side cross section of the slider 100, applies a perpendicular magnetic field Φ to the recording medium M, and applies a hard film Ma of the recording medium M to the recording medium M. Recording is performed by magnetizing in the vertical direction. The recording medium M has a hard film Ma with high residual magnetization on the medium surface side and a soft film Mb with high magnetic permeability on the inner side of the hard film Ma. The recording medium M is, for example, a circular disk, and is rotated by a spindle motor with the center of the circle as a rotation axis. The slider 100 is formed of a non-magnetic material such as Al ₂ O ₃ .TiC. The medium facing surface F of the slider 100 faces the recording medium M. When the recording medium M rotates, the slider 100 is moved by the air flow on the surface. It floats from the surface of the recording medium M.

A nonmagnetic insulating layer 101 made of an inorganic material such as Al ₂ O ₃ or SiO ₂ is formed on the trailing end surface 100 b of the slider 100, and a reproducing portion R is formed on the nonmagnetic insulating layer 101. . The reproducing portion R includes a lower shield layer 102, an upper shield layer 105, an inorganic insulating layer (gap insulating layer) 104 that fills between the lower shield layer 102 and the upper shield layer 105, and a position within the inorganic insulating layer 104. And a reproducing element 103 to be used. The reproducing element 103 is a magnetoresistive effect element such as AMR, GMR, or TMR.

  On the upper shield layer 105, a lower layer coil 107 is formed of a conductive material with a coil insulating base layer 106 interposed therebetween. The lower layer coil 107 is made of, for example, one or more kinds of nonmagnetic metal materials selected from Au, Ag, Pt, Cu, Cr, Al, Ti, NiP, Mo, Pd, and Rh. Alternatively, a laminated structure in which these nonmagnetic metal materials are laminated may be used. A nonmagnetic insulating layer 108 is formed around the lower coil 107.

On the nonmagnetic insulating layer 108, a main magnetic pole layer 110 and an auxiliary yoke layer 109 that overlaps the main magnetic pole layer 110 in a plan view and is magnetically connected are formed. The auxiliary yoke layer 109 is made of a magnetic material having a magnetic flux saturation density lower than that of the main magnetic pole layer 110 and has a function of magnetically connecting to the main magnetic pole layer 110 and guiding the magnetic flux to the main magnetic pole layer 110. The main magnetic pole layer 110 has a saturation magnetic flux density such as Ni—Fe, Co—Fe, or Ni—Fe—Co on the planarized auxiliary yoke layer 109 and the nonmagnetic insulating layer 108 via a plating underlayer. Made of high ferromagnetic material. An insulating material layer 111 is formed around the main magnetic pole layer 110, and a magnetic gap layer 113 which is a nonmagnetic layer is formed on the main magnetic pole layer 110. The insulating material layer 111 and the magnetic gap layer 113 are made of a nonmagnetic insulating material such as Al ₂ O ₃ , SiO ₂ , Al—Si—O, for example. In the present embodiment, the auxiliary yoke layer 109 is disposed under the main magnetic pole layer 110, but the auxiliary yoke layer 109 may be disposed over the main magnetic pole layer 110.

  An upper coil 115 is formed on the magnetic gap layer 113 with a coil insulating base layer 114 interposed therebetween. Similar to the lower layer coil 107, a plurality of upper layer coils 115 are formed of a conductive material. The upper coil 115 is made of, for example, one or two or more nonmagnetic metal materials selected from Au, Ag, Pt, Cu, Cr, Al, Ti, NiP, Mo, Pd, and Rh. Alternatively, a laminated structure in which these nonmagnetic metal materials are laminated may be used.

  The lower coil 107 and the upper coil 115 are electrically connected at their end portions (not shown) in the X direction shown in the figure so as to form a solenoid, and the main magnetic pole layer 110 or the auxiliary yoke layer 109 is wound around. ing. The shape of the coil layer (magnetic field generating means) is not particularly limited to a solenoid shape, and may be a spiral shape, for example.

  A nonmagnetic insulating layer 116 is formed around the upper coil 115, and a return path layer (auxiliary magnetic pole layer) 118 is formed from a ferromagnetic material such as permalloy from the nonmagnetic insulating layer 116 to the magnetic gap layer 113. Has been. The return path layer 118 has a front end surface 118a exposed to the facing surface F, and is opposed to the main magnetic pole layer 110 with a gap interval at the facing surface F. A depth side end portion of the return path layer 118 in the height direction is a connection portion 118 b connected to the main magnetic pole layer 110. A throat height determining layer 117 is formed of an inorganic or organic material on the magnetic gap layer 113 at a predetermined distance from the facing surface F. The throat height of the perpendicular magnetic recording head H is defined by the distance from the facing surface F to the front edge of the throat height determining layer 117. The return path layer 118 is covered with a protective layer 119 made of a nonmagnetic insulating material.

  This perpendicular magnetic recording head H is characterized by the relationship between the flare angle α2 of the second flare portion 110C of the main magnetic pole layer 110 and the flare angle β of the flare portion 109B of the auxiliary yoke layer 109. Hereinafter, the shapes and relationships of the flare portions 110B, 110C, and 109B of the main magnetic pole layer 110 and the auxiliary yoke layer 109 will be described with reference to FIGS.

  As shown in FIG. 2, the main magnetic pole layer 110 is integrally formed in order from the surface F facing the recording medium M in order, a pole straight portion 110A, a first flare portion 110B, and a second flare portion 110C. And a base 110D. The second flare portion 110C is a region for adjusting the magnetic flux so that the magnetic domain structure generated in the base portion 110D is directed in the track direction during excitation, and the first flare portion 110B is separated from the base portion 110D and the second flare portion 110C. This is an area for narrowing the recording magnetic field toward the pole straight portion 110A. The first flare part 110B is connected to the second flare part 110C with the first flare angle α1 extending in the track width direction from the pole straight part 110A toward the depth direction back side, and the dimension in the track width direction is widened. The second flare portion 110C is connected to the base portion 110D with the second flare angle α2 extending in the track width direction from the first flare portion 110B toward the depth direction rear side (base portion 110D). Here, α1 <α2.

  The pole straight portion 110A constitutes a front end surface 110a exposed on the surface F facing the recording medium M, and is formed with a predetermined track width Tw in the track width direction and a predetermined neck height Nh in the height direction. It is formed with. The pole straight portion 110A has a trapezoidal shape (bevel shape) in which the cross-sectional shape viewed from the surface F facing the recording medium M is narrow on the nonmagnetic insulating layer 108 side over the entire length thereof. Yes. By making the pole straight portion 110A beveled, the write track width Tw when the skew angle is applied can be made smaller than when the cross-sectional shape is rectangular (when not beveled).

  The first flare portion 110B is formed in a trapezoidal shape in which the cross-sectional shape viewed from the surface F facing the recording medium M becomes narrower on the nonmagnetic insulating layer 108 side. The trapezoidal shape of the first flare portion 110B coincides with the cross-sectional shape of the pole straight portion 110A at the connection portion with the pole straight portion 110A, and is the length of the long bottom side of the trapezoid from the pole straight portion 110A toward the back in the height direction. And the ratio of the length of the short base side is gradually deformed so as to approach 1 and is connected to the second flare portion 110C. The cross-sectional shape of the connection portion of the second flare portion 110C with the base portion 110D coincides with the cross-sectional shape of the base portion 110D and is short (the ratio of the length of the long base side to the length of the short base side is equal to 1). ing. Thus, the magnetic domain can be appropriately controlled by increasing the dimension in the track width direction from the first flare portion 110B to the base portion 110D. And it has a main magnetic pole structure that can suppress pole lockup by magnetic domain control.

  The auxiliary yoke layer 109 has a front end portion 109A, which is the front end in the height direction, overlapping the second flare portion 110C, and the dimension in the track width direction is widened at a flare angle β from the front end portion 109A toward the rear side in the height direction. A flare portion 109B is formed, and the rear end in the height direction of the flare portion 109B is connected to the base portion 109C. The flare angle β of the auxiliary yoke layer 109 is smaller than the second flare angle α2 and satisfies the relationship β <α2.

  Further, the flare portion 109B of the auxiliary yoke layer 109 and the first and second flare portions 110B and 110C of the main magnetic pole layer 110 are formed symmetrically with respect to the center line in the track width direction when viewed from the trailing side and the leading side. Yes.

  Next, referring to FIGS. 3A to 3C and FIG. 4, the effects of the present invention will be described by comparing the first and second embodiments of the present invention with the comparative example. Here, the flare angle β is considered with α1 = 40 ° and α2 = 70 °. 3A shows an auxiliary yoke layer 109 ′ having a flare angle β ′ of 90 ° as a comparative example, and FIG. 3B shows Example 1 of the auxiliary yoke layer 109 having a flare angle β of 70 °. FIG. 3C shows a second embodiment of the auxiliary yoke layer 109 having a flare angle β of 45 °. In the comparative example, α1 <α2 <β, whereas in Examples 1 and 2, the flare angle β is smaller than the first flare angle α1 and the second flare angle α2. That is, in Examples 1 and 2, the second flare angle α2 of the main magnetic pole layer 110 is larger than the flare angle β of the auxiliary yoke layer 109, but in the comparative example, the auxiliary yoke layer 109 ′ is larger than the second flare angle α2 of the main magnetic pole layer 110. Has a large flare angle β ′.

  The flare portion 109B of the auxiliary yoke layer 109 is located on the far side in the height direction from the second flare portion 110C of the main magnetic pole layer 110. In addition, the outline of the flare portion 109B of the auxiliary yoke layer 109 is formed so as to be within the outline of the second flare portion 110C of the main magnetic pole layer 110 in plan view (viewed from the trailing side or the leading side).

When the flare angle of the auxiliary yoke layer is changed from 90 ° to 70 °, 45 °, and further 20 ° in the main magnetic pole layer 110 and the auxiliary yoke layer 109 formed as in the above comparative example and Examples 1 and 2. The results of simulating the magnetic field strength in the recording medium M are shown in the following Table 1 and the graph of FIG. In FIG. 4, the horizontal axis represents the flare angle β, and the vertical axis represents the magnetic field strength (Oe (× 10 ³ / 4π A / m)).

<Table 1>
Flare angle β 90 ° 70 ° 45 ° 20 ° Maximum magnetic field strength (Oe) 6479 6595 6627 6207

  According to this simulation result, the maximum magnetic field strength increased as the flare angle β decreased from the flare angle β = 90 °, and reached the maximum at the flare angle β = 45 °. Thus, the maximum magnetic field strength decreased as the flare angle β became smaller than 45 °. From the above simulation results, it can be seen that the maximum magnetic field strength is higher when the flare angle β is smaller than 90 °. The range of the flare angle β is preferably 45 ° ≦ β <70 °, that is, the flare angle β is It can be seen that it is preferably smaller than the flare angle α2. However, if the flare angle β is smaller than the flare angle α1, it is difficult to collect magnetic flux at the tip of the main magnetic pole layer 110, and the magnetic field strength in the recording medium M becomes small.

  The main magnetic pole layer 110 of the present embodiment is formed in a shape having a two-stage flare structure of the first flare portion 110B and the second flare portion 110C, but the main magnetic pole layer shape is, for example, as shown in FIG. It may have a one-step flare structure or may have a three-step or more flare structure.

  A second embodiment having a one-stage flare structure is shown in FIG. The main magnetic pole layer 120 having a one-step flare structure shown in FIG. 5 has a pole straight portion 120A, a flare portion 120B, and a base portion 120C which are integrally formed in order from the surface facing the recording medium. The pole straight portion 120A constitutes a leading end surface 120a exposed on the surface facing the recording medium, the track width direction dimension is formed with a predetermined write track width Tw, and the height direction dimension is a predetermined neck height Nh. Is formed. The pole straight portion 120A has a trapezoidal shape (bevel shape) in which the cross-sectional shape seen from the surface facing the recording medium is narrow on the nonmagnetic insulating layer 108 side over the entire length. The flare portion 120B is formed in the same shape as the pole straight portion 120A, that is, a trapezoidal shape in which the cross-sectional shape viewed from the surface facing the recording medium becomes narrower on the nonmagnetic insulating layer 108 side. The trapezoidal shape of the flared portion 120B coincides with the cross-sectional shape of the pole straight portion 120A at the connection portion with the pole straight portion 120A, and the long bottom side of the trapezoid extends from the pole straight portion 120A to the base portion 120C toward the back in the height direction. The length is gradually deformed so that the ratio of the length to the length of the short base is equal to 1 at the joint with the base 120C.

  The auxiliary yoke layer 109 is the same as that of the first embodiment shown in FIGS. In other words, the auxiliary yoke layer 109 has a front end 109A, which is the front end in the height direction, overlapping the flare portion 120B in a plan view, and a flare angle β in the track width direction from the front end 109A toward the rear in the height direction. The dimensions are expanding. The flare angle β of the auxiliary yoke layer 109 is smaller than the flare angle α and satisfies the relationship β <α. In the second embodiment, the flare angle β of the flare portion 109B is preferably 45 ° ≦ β <70 °.

  In the first and second embodiments described above, the auxiliary yoke layer 109, the flare portions 109B of the main magnetic pole layers 110 and 120, the first and second flare portions 110B and 110C, and the flare portion 120B are formed from the trailing side and the leading side. When viewed (plan view), it is formed symmetrically with respect to the center line in the track width direction. The auxiliary yoke layer 109 may be formed on either the trailing side or the leading side with respect to the main magnetic pole layers 110 and 120.

  In the first and second embodiments, the lateral width (track direction width) of the base portions 110D and 120C of the main magnetic pole layer 110 and the lateral width of the base portion 109C of the auxiliary yoke layer 109 are formed to be substantially equal. That is, in FIG. 3C, when the width of the base 110D in the track width direction is W1, and the width of the base 109C in the track width direction is W2, W1 = W2. In this embodiment, FIG. 6 shows a cross-sectional view in which the main magnetic pole layer 110 and the auxiliary yoke layer 109 are longitudinally cut along the center line in the track width direction (cut line VI-VI in FIG. 3C). In this central section, since the throat height determining layer 117 is interposed between the main magnetic pole layer 110 and the return path layer 118, the facing area between the main magnetic pole layer 110 and the return path layer 118 is small, and the leakage of magnetic flux is small. . However, in the portion (FIG. 7) cut vertically along the cutting line VII-VII in FIG. 3C, the throat height determining layer 117 is not interposed between the main magnetic pole layer 110 and the return path layer 118, and the main magnetic pole layer Since the distance between 110 and the return path layer 118 is short, magnetic flux leakage and loss are likely to occur.

  Therefore, in yet another embodiment of the present invention, the lateral width (width in the track width direction) of the auxiliary yoke layer 109 is formed wider than the lateral width of the main magnetic pole layer 130 in plan view. FIG. 8 is a plan view of the main part of this embodiment. FIG. 9 is a longitudinal sectional view taken along a cutting line IX-IX in FIG. 8, and FIG. 10 is a longitudinal sectional view taken along a cutting line XX in FIG. In the main magnetic pole layer 130, the width of the base portion 130D is narrower than the width of the base portion 110D of the main magnetic pole layer 110, but the configuration of the pole straight portion 130A first and second flare portions 130A and 130B is the same as that of the corresponding main magnetic pole layer 110. The configuration is the same as that of the pole straight portion 110A and the first and second flare portions 110B and 110C.

  In this embodiment, as is apparent from FIG. 9, the throat height determining layer 117 is interposed between the main magnetic pole layer 130 and the return path layer 118 in the central cross section. The area where 118 is opposed is small, and there is little leakage of magnetic flux. Further, as apparent from FIG. 10, the throat height determining layer 117 is not interposed between the main magnetic pole layer 130 and the return path layer 118 at the edge in the width direction of the main magnetic pole layer 130. Since the return path layer 118 is far away, the leakage and loss of magnetic flux are small, and the recording ability is improved.

In this embodiment, when the width of the base portion 130D of the main magnetic pole layer 130 is W1, and the width of the base portion 109C of the auxiliary yoke layer 109 is W2, the width is formed so as to satisfy W1 <W2. Preferably, 1.5 × W1 ≦ W2 is satisfied.
When this condition is satisfied, the magnetic field generated from the coils (the lower coil 107 and the upper coil 115) is collected at the base portion 109C of the wide auxiliary yoke layer 109, and the leakage magnetic flux from the main magnetic pole layer 130 to the return path layer 118 is efficiently narrowed down. And the loss of magnetic flux is reduced, and the recording ability is improved.

  Similarly, in the main magnetic pole layer 120 and the auxiliary yoke layer 109 having the one-step flare portion 120B shown in FIG. 5, the width of the base portion 120C of the main magnetic pole layer 120 is W1, and the width of the base portion 109C of the auxiliary yoke layer 109 is W2. In other words, if W1 <W2, more preferably 1.5 × W1 ≦ W2, the loss of magnetic flux is reduced as in the embodiment shown in FIG. 8, and the recording performance is improved. Is obtained.

1 is a partial cross-sectional view showing a laminated structure of a perpendicular magnetic recording head according to an embodiment of the present invention when viewed from a track width direction. FIG. 2 is a perspective view showing a first embodiment of a main magnetic pole layer (two-stage flare structure) and an auxiliary yoke layer in FIG. 1. It is a figure which shows the relationship between a main magnetic pole layer and an auxiliary yoke layer seeing from the trailing side, Comprising: (A) shows the comparative example in case the flare angle (beta) of an auxiliary yoke layer is 90 degrees, (B) is auxiliary. Example 1 in which the flare angle of the yoke layer is 70 ° is shown, and (C) is a diagram showing Example 2 in which the flare angle of the auxiliary yoke layer is 45 °. It is a figure which shows the result of having simulated the maximum magnetic field intensity at the time of changing flare angle (beta) of an auxiliary yoke layer from 90 degrees to 20 degrees in a graph. FIG. 10 is a perspective view showing a second embodiment in which the present invention is applied to a perpendicular magnetic recording head having a one-step flare structure with a main magnetic pole layer. It is sectional drawing which follows the cutting line VI-VI of FIG.3 (C). It is sectional drawing which follows the cutting line VII-VII of FIG.3 (C). FIG. 4 is a view similar to FIG. 3C, showing another embodiment in which the width of the auxiliary yoke layer 109 is formed wider than the width of the main magnetic pole layer 110 in plan view. It is sectional drawing which follows the cutting line IX-IX of FIG. FIG. 9 is a cross-sectional view taken along a cutting line XX in FIG. 8.

Explanation of symbols

108 Nonmagnetic insulating layer 109 Auxiliary yoke layer 109B Flare portion 109C Base 110 Main pole layer 110A Pole straight portion 110B First flare portion 110C Second flare portion 110D Base 117 Throat height determining layer 118 Return path layer 120 Main pole layer 120C Base 130 Main magnetic pole layer 130C Base H Perpendicular magnetic recording head M Recording medium Ma Hard film Mb Soft film Tw Track width α Flare angle α1 First flare angle α2 Second flare angle β Flare angle W1 Base width of main magnetic pole layer W2 Auxiliary yoke layer Width of base

Claims (6)

A main magnetic pole layer having a pole straight portion exposed on the surface facing the recording medium and a flare portion extending in the track width direction from the pole straight portion toward the back in the height direction, and overlapping with the main magnetic pole layer in plan view A perpendicular magnetic recording head having an auxiliary yoke layer to be electrically connected,
The auxiliary yoke layer includes a flare portion that spreads in the track width direction from the surface facing the recording medium toward the back in the height direction,
The flare portion of the auxiliary yoke layer is located on the far side in the height direction from the flare portion of the main magnetic pole layer,
The perpendicular magnetic recording head according to claim 1, wherein the flare portion of the main magnetic pole layer is formed to have a flare angle larger than the flare angle of the auxiliary yoke layer. 2. The perpendicular magnetic recording head according to claim 1, wherein the auxiliary yoke layer has a flare angle of not less than 45 [deg.] And less than 70 [deg.]. 3. The perpendicular magnetic recording head according to claim 1, wherein the flare portion of the main magnetic pole layer is connected to the pole straight portion and extends in the track width direction at a first flare angle toward the back side in the height direction. And a second flare portion that is connected to the first flare portion and extends in the track width direction at a second flare angle toward the back in the height direction, the second flare angle of the auxiliary yoke layer Perpendicular magnetic recording head larger than flare angle. 4. The perpendicular magnetic recording head according to claim 3, wherein the first flare angle is smaller than the second flare angle and equal to or smaller than the flare angle of the auxiliary yoke layer. 5. The perpendicular magnetic recording head according to claim 1, further comprising a return path layer stacked on the main magnetic pole layer with a nonmagnetic layer interposed between the surface facing the recording medium and the perpendicular magnetic recording head. The main magnetic pole layer has a base portion formed integrally with the pole straight portion and the flare portion of the main magnetic pole layer toward the depth direction rear side, and the auxiliary yoke layer extends toward the depth direction rear side. Perpendicular magnetic recording having a base formed integrally with a flare portion of the layer, wherein the width of the base portion of the auxiliary yoke layer is wider than the width of the base portion of the main magnetic pole layer in the track width direction head. 6. The perpendicular magnetic recording head according to claim 5, wherein the width of the base of the main magnetic pole layer is W1, and the width of the base of the auxiliary yoke layer is W2.
1.5 × W1 ≦ W2
Satisfying perpendicular magnetic recording head.

Images