SU851464A1 - Magnetoreactive head - Google Patents

Description

(54) MAGNETIC RESISTANT HEAD

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The invention relates to instrumentation, in particular, to a technique of magnetic recording and reproducing information, and can be used in the manufacture of magnetoresistive heads.

A known magnetoresistive head comprising a lower magnetic screen, a lower dielectric layer, a magnetoresistive element, a backing layer, an upper dielectric layer, and an upper magnetic screen Cll.

The disadvantages of this head are low sensitivity, unreliable operation, and the danger of erasing reproduced information on the recording media. A magnetoresistive head containing a dielectric substrate, a dielectric coating, a magnetic core having two branches, a magnetoresistive element in the additional gap and a gasket in the working gap is also known of the core, as well as the working surface formed by the electric substrate, the branches of the core and the dielectric coating.

The disadvantages of this head are yut-. | SJ low sensitivity and low reliability.

The purpose of the invention is to increase the sensitivity and reliability of the magnetoresistive head.

The goal is achieved by the fact that a magnetoresistive head containing a dielectric substrate, a dielectric coating, a magnetic core, two branches, a magnetor, a roto element in an additional gap and a gasket in the core working gap, and a working surface formed by the dielectric substrate, branches core and dielectric coating, equipped with two antiferromagnetic layers, one of which is littered over the first branch of the core, and the other over the second branch of the core, and a dielectric nical strips arranged on both sides of the magnetoresistive element, the latter being installed in the core branches plane at an oblique angle to the working surface 45f of the head.

Claims (1)

FIG. 1 shows the proposed head, FIG. 2 - the same, functional scheme. The magnetic head contains a magnetoresistive element 1, an antiferromagnetic layer 2, a dielectric layer 3, which is a gasket in the gap than the gap, a magnetic core 4, two dielectric identical strips 5 and b, located along the edges of the magnetic resistive element 1, along e length. An upper antiferromagnetic layer 7 is located on the upper branch of core 4. The head has a dielectric coating formed by dielectric layers 3 and 8 and dielectric platform 9. Magnetoresistive element 1 is oriented at an angle of 45 ° relative to the working surface of the magnetic head facing the magnetic recording medium 10 . The head works as follows. Under the action of the signal magnetic field ff created by the record carrier and closed through the magnetic core 4 to the magnetoresistive element 1, the magnetization vector i7 in the latter rotates by some angle d relative to its fixed position, proportional to the magnitude of the signal magnetic field, and with frequency equal to the frequency of this gender. When a constant electric 1 flows through element 1, a change in the orientation of vector il relative to the orientation of vector T at some angle 0 under the action of a signal magnetic field ff causes a change in the electrical resistivity of the ferromagnetic material from which the Magnetoresistive element 1 is made: f pg- uf- cosQs, (, 1) where p is the electrical resistivity of the ferromagnetic material of the magnetoresistive element, p is its isotropic electrical resistivity, L is the specific electric mag itosoprotivlenie 9 - ode angle IU vectors M and j. Since the dependence of the output signal of element I on the magnitude of the signal magnetic field according to expression (1) is nonlinear, the linear resistive element 1, and therefore the vector j of the detection current density 9, is oriented to linearize it at an angle of 45 relative to the working surface. heads. At the same time, the vector m in the magnetometer is transparent: element 1 and core 4 is oriented parallel to the working surface of the head. Thus, the absence of the signal magnetic field FT, the vectors M and j are oriented at 45 °, which makes a linear relationship between the input and output parameters of the magnetoresistive element 1. The orientation of the vector I in the magnetoresistive element and the core 4 parallel to the working surface provides the process of magnetization reversal of these elements under the action of the signal magnetic field if along the axis of difficult magnetization and is characterized by the absence of nonlinear distortion and very high speed. The location on the surfaces of the magnetoresistive element 1 and the core 4 of the antiferromagnetic layers 2 and 7 provides the single-domain state of the first due to the exchange interaction between the ferromagnetic 1, 4 and antiferromagite 2, 7 film elements. Due to this interaction, in the absence of a signal magnetic field If, the vector And in the magneto-resistive element 1 is oriented strictly with a 45 ° angle relative to the direction of the vector j in it, despite the strong demagnetization effects inherent in elements of this shape. Two identical dielectric strips 5 and b provide electrical insulation of the element 1 from the magnetic core 4. The upper dielectric layer 8, which is characterized by high mechanical strength and wear resistance, protects the head from mechanical and climatic influences. The high sensitivity of the head is ensured by a uniform distribution of the signal magnetic flux across the width of the magnetoresistive element due to the use of a core, a uniform current distribution across the width of the magnetoresistive element, and a single-domain state of the core. High reliability of the head operation is ensured by the absence of mechanical interaction between the magnetoresistive element and the carrier, as well as high mechanical strength and wear resistance of the dielectric layers in which it is enclosed. A magnetoresistive head comprising a dielectric substrate, a dielectric coating, a magnetic core having two branches, a magnetoresistive element in an additional gap, and a gasket in the working gap of the core, as well as a working surface formed by the dielectric SUBSTRACT, core branches and a dielectric coating that differs in that, in order to increase the sensitivity and reliability of the head, it is equipped with two antiferromagnetic layers, one of which is placed over the first wind and the core and the other on top of the second