JPH1069613A - Magnetic head, its manufacture and magnetic disk device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head capable of reproducing recording magnetization with superior reproducing sensitivity without providing a magnetic gap and a shield layer by orienting the axis of easy magnetization of a magnetic substance in the direction orthogonal to a conductor. SOLUTION: The magnetic head 10 has a magnetic layer 1 constituting a magnetic core, a magnetic layer 2 constituting a magnetic circuit in a loop pattern coupled magnetically with the magnetic layer 1 and a conductor line 3 provided to be intersected to the magnetic circuit for the purpose of supplying a prescribed current to the magnetic core. Then, the axis 4 of easy magnetization of the magnetic layer 1 is oriented in parallel to the direction of recording magnetization of a vertical magnetic recording medium where its recording magnetization is formed in the direction vertical to a recording surface. The axis 5 of easy magnetization of the magnetic layer 2 is oriented orthogonally to the direction of recording magnetization of the vertical magnetic recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a magnetic head for reproducing information recorded on a magnetic recording medium, a method of manufacturing the same, and a magnetic disk drive using the same.

[0002]

2. Description of the Related Art In recent years, as the demand for large-capacity magnetic disk drives has increased, a magnetic head capable of recording information on a magnetic recording medium at a high density and reproducing the recorded information with high sensitivity has been demanded. In addition, with the downsizing of the magnetic disk device, a magnetic head capable of coping with a reduction in the speed of a magnetic recording medium is required. In response to such demands, an inductive head using a coil and a magnetoresistive element (MR (Ma
gneto-Resistance element) and a conventional composite thin-film magnetic head composed of an MR head using a magnetic head were developed and put into practical use instead of a conventional inductive magnetic head using a coil for recording and reproducing information. ing. That is, in the inductive magnetic head, the output of the reproduced signal is proportional to the relative speed between the magnetic recording medium and the magnetic head. For this reason, when the speed of the magnetic recording medium is reduced, the output of the reproduction signal from the inductive magnetic head is reduced, and good reproduction cannot be performed. On the other hand, in a conventional composite type thin film magnetic head using an MR head, an inductive head is used for recording information, and an MR head is used for reproducing information. As is well known, the MR head is a magnetic flux response type magnetic head that electromagnetically converts the magnetic flux flowing into the MR element and outputs a reproduction signal, and therefore obtains a high-output reproduction signal regardless of the relative speed. Can be. For this reason, the conventional composite type thin film magnetic head reproduces information with higher sensitivity than the conventional induction type magnetic head even when the speed of the magnetic recording medium is reduced.

[0003]

The conventional composite thin-film magnetic head using the above-described MR head has a problem that the head structure is more complicated than the conventional inductive magnetic head. Was. Specifically, in the conventional composite type thin film magnetic head, it is necessary to provide a reproducing magnetic gap and a shield layer around the MR element, and a magnet is arranged to make the MR film of the MR element into a single magnetic domain. Such a configuration was required. Furthermore, in order to perform linear reproduction, it is necessary to provide a bias layer for applying a bias magnetic field, a power supply for supplying a direct current to the bias layer, and the like. Also,
In such a conventional method of manufacturing a composite thin-film magnetic head, it was necessary to perform heat treatment on a magnetic layer and a shield layer provided around the MR element in order to obtain good magnetic characteristics (reproduction sensitivity). For this reason, there was a problem that it was difficult to improve the yield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a magnetic head having a simpler structure than that of a conventional inductive head with a higher read sensitivity and a method of manufacturing the same. It is an object of the present invention to provide a magnetic disk drive using the same.

[0005]

According to the present invention, there is provided a magnetic head comprising:
A magnetic core composed of at least one magnetic body, and an elongated conductor insulated within the magnetic core and supplied with at least a high-frequency signal, wherein the easy axis of the magnetic body is orthogonal to the conductor. Orientation. With the configuration described above, it is possible to obtain a magnetic flux responsive reproducing head that reproduces recorded magnetization with excellent reproducing sensitivity without providing a magnetic gap, a shield layer, and the like.

Further, a magnetic head according to another aspect of the present invention has a first magnetic head in which the easy axis is oriented in a direction perpendicular to the surface of the magnetic recording medium.
A second magnetic body having an easy axis of magnetization oriented in a direction orthogonal to the easy axis of the first magnetic body;
A conductor that is orthogonal to the axis of easy magnetization of the magnetic body and is insulated between the first magnetic body and the second magnetic body, and that is supplied with at least a high-frequency signal. With the configuration described above, it is possible to obtain a magnetic flux responsive reproducing head that reproduces recorded magnetization with excellent reproducing sensitivity without providing a magnetic gap, a shield layer, and the like.

Further, in a magnetic head according to another aspect of the present invention, a protrusion protruding from a lower end of the first magnetic body is provided at a lower end of the second magnetic body, and the protruding part is connected to the magnetic recording medium. Place in close proximity. With the configuration described above, it is possible to prevent the recording magnetization of the magnetic recording medium from being erased by the leakage magnetic flux from the lower end of the first magnetic body.

Further, in a magnetic head according to another aspect of the present invention, the thickness of the second magnetic body is formed thinner than the thickness of the first magnetic body. With the above configuration, the sensitivity of the reproduced signal can be improved.

According to the method of manufacturing a magnetic head of the present invention, a step of orienting a magnetization easy axis of a first magnetic body in a predetermined direction by heating in a static magnetic field; A first insulating layer forming step of forming one insulating layer, a conductor forming step of forming a conductor on the first insulating layer in a direction orthogonal to an easy axis of magnetization of the first magnetic body, and the conductor A second insulating layer forming step of forming a second insulating layer thereon, and a second magnetic body on the second insulating layer in a static magnetic field.
Forming the magnetic material while orienting the easy axis of the magnetic material in a direction orthogonal to the easy axis of the first magnetic material. With the above configuration, the magnetic gap,
In addition, it is possible to manufacture a magnetic flux responsive reproducing head that reproduces recorded magnetization with excellent reproduction sensitivity without providing a shield layer and the like.

Further, in the method of manufacturing a magnetic head according to another aspect of the present invention, the step of orienting the axis of easy magnetization of the second magnetic body in a predetermined direction by heating in a static magnetic field; A first insulating layer forming step of forming a first insulating layer thereon, and a conductor forming step of forming a conductor on the first insulating layer in a direction parallel to the easy axis of magnetization of the second magnetic body. Forming a second insulating layer on the conductor, forming a first magnetic body on the second insulating layer in a static magnetic field, and easily magnetizing the first magnetic body in a static magnetic field. Forming the axis while orienting the axis in a direction orthogonal to the axis of easy magnetization of the second magnetic body. With the above configuration, it is possible to manufacture a magnetic flux responsive reproducing head that reproduces recorded magnetization with excellent reproducing sensitivity without providing a magnetic gap and a shield layer.

According to the magnetic disk drive of the present invention, a first magnetic body having an easy axis of magnetization oriented in a direction perpendicular to the surface of a magnetic recording medium, and a magnetization perpendicular to the easy axis of the first magnetic body are provided. A second magnetic body whose easy axis is oriented, and which is orthogonal to the easy magnetization axis of any one of the first magnetic body and the second magnetic body, and wherein the first magnetic body and the second magnetic body A conductor insulated between the magnetic material, a carrier signal oscillating means for applying a high-frequency signal to the conductor, and a bias magnetic field applied to a magnetic core comprising the first magnetic material and the second magnetic material And a means for holding the magnetic recording medium so as to move relative to the magnetic core. With the configuration described above, it is possible to obtain a magnetic flux responsive reproducing head that reproduces recorded magnetization with excellent reproducing sensitivity without providing a magnetic gap, a shield layer, and the like.

Further, a magnetic disk drive according to another aspect of the present invention includes:
The frequency of the high-frequency signal is 500 kHz to 10 MHz
It is. With the above configuration, the operation of the circuit connected to the magnetic head and processing the reproduced signal can be stabilized.

A magnetic head according to another aspect of the present invention includes an inductive head including at least a magnetic core and a coil, and the magnetic head according to claim 1 disposed in the magnetic core. The magnetic head is arranged such that the axis of easy magnetization of the magnetic core is parallel to the direction of the magnetic flux flowing in the magnetic core of the inductive head. With the above configuration, it is possible to obtain a composite thin-film magnetic head having excellent reproduction sensitivity and a simple configuration.

Further, a magnetic disk drive according to another aspect of the present invention includes:
A magnetic head according to claim 9 is mounted. With the above configuration, the configuration of the magnetic disk device can be simplified.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments showing a magnetic head, a method of manufacturing the same, and a magnetic disk drive using the same will be described below with reference to the drawings.

First Embodiment Structure of Magnetic Head FIG. 1 is a perspective view showing a magnetic head according to a first embodiment of the present invention. FIG. 2 is a block diagram showing a reproducing circuit of a magnetic reproducing apparatus having the magnetic head shown in FIG. In FIG. 1, a magnetic head 10 includes a first magnetic layer 1 forming a magnetic core, and a second magnetic layer 2 magnetically coupled to the first magnetic layer 1 and forming a loop-shaped magnetic circuit. And a conductor line 3 provided in linkage with the magnetic circuit to supply a predetermined current to the magnetic core. The first magnetic layer 1 and the second magnetic layer 2 are made of Co—Zr—
It is formed of an amorphous thin film made of Nb-Ta. One example of a preferable composition of the amorphous thin film is Co87
%, Zr 5.5%, Nb 3%, and Ta 4.5%. The thickness of the first magnetic layer 1 is, for example, 1 μm, and the thickness of the second magnetic layer 2 is, for example, 0.2 μm. The axis of easy magnetization 4 of the first magnetic layer 1 corresponds to the direction of the recording magnetization of the perpendicular magnetic recording medium (not shown) in which the recording magnetization is formed perpendicular to the recording surface (indicated by arrow 7 in the figure). (Direction shown). Easy axis 5 of second magnetic layer 2
Are oriented so as to be orthogonal to the direction of the recording magnetization of the perpendicular magnetic recording medium. Magnetic head 10 of the present embodiment
Is a reproducing head that performs only reproduction of recorded information.
Is formed on the perpendicular magnetic recording medium in proximity to the recording surface of the perpendicular magnetic recording medium. The conductor wire 3 is formed of a Cu thin film or the like, and is provided between the first magnetic layer 1 and the second magnetic layer 2 so as to penetrate the magnetic core. Electrode terminals 3a and 3b are provided at both ends of the conductor wire 3 to allow an AC constant current and a DC minute current to flow. Further, an insulating film 6 is formed between the first magnetic layer 1 and the second magnetic layer 2 and the conductor wire 3, and the first magnetic layer 1 and the second magnetic layer 2 are connected to the conductor wire 3. 3 is electrically insulated.

As shown in FIG. 2, the magnetic reproducing apparatus comprises a magnetic head 10 having a magnetic impedance element 21, a carrier signal generator 22 connected to terminals 23 and 24 of the magnetic head 10, and a reproduced signal detecting circuit 25. And
The magnetic impedance element 21 is equivalent to the conductor wire 3 (FIG. 1) of the magnetic head 10, and has terminals 23,
Reference numeral 24 corresponds to the electrode terminals 3a and 3b shown in FIG. The carrier signal generator 22 supplies the magnetic impedance element 21 with a carrier signal that is an AC constant current and a minute DC current for bias-magnetizing the magnetic core in one direction. The reproduction signal detection circuit 25 is connected to the terminal 23
A voltage generated between the terminal and the terminal is measured and output from the terminal as a reproduction signal.

Next, the reproducing operation of the magnetic head 10 of the embodiment will be described. When the magnetic head 10 is arranged on the recording surface of the perpendicular magnetic recording medium, the magnetic core composed of the first and second magnetic layers 1 and 2 has the magnetic flux of the recording magnetization of the information recorded on the recording surface. Pass. Therefore, the magnetic core is magnetized by the magnetic flux, and the magnetic permeability of the magnetic core decreases. That is, the state is equivalent to a state where the impedance of the magnetic impedance element 21 shown in FIG. 2 is reduced. At this time, since an alternating constant current (carrier signal) is supplied to the conductor wire 3 from the carrier signal generator 22, a magnetic impedance element 2 is provided between the terminals 23 and 24.
A back electromotive voltage proportional to the impedance of 1 is generated. As a result, the value of the voltage signal output from the reproduction signal detection circuit 25 is proportional to the value of the impedance, that is, the magnetic permeability. In other words, the amount of magnetic flux of the recording magnetization flowing into the magneto-impedance element 21, that is, a voltage signal inversely proportional to the strength of the magnetic field is output as a reproduction signal from the reproduction signal detection circuit 25, which is a so-called magnetic flux response type reproduction. Is performed. To increase the value of the reproduction signal output from the reproduction signal detection circuit 25, the magnetic impedance element 21
It is preferable that the magnetic impedance is high and the magnetic flux response is high. Therefore, it is desirable that the magnetic head 10 operates with a carrier signal having a frequency as high as possible within a range where the magnetic core has a high magnetic permeability. However, a magnetic core that can be used at a frequency of several MHz is desirable for performing a stable operation in the subsequent reproduced signal detection circuit 25.

Here, the first and second magnetic layers 1 and 2 constituting the magnetic core of the magnetic head 10 will be described with reference to FIGS.
This will be described in detail with reference to FIG. FIGS. 3A and 3B are explanatory diagrams showing the positional relationship between the easy axis of the magnetic impedance element and the magnetic flux of the external magnetic field.
FIG. 4 is a graph showing a change in the output of the magnetic impedance element in the positional relationship shown in FIG. 3A, and FIG. 5 is a graph showing the output of the magnetic impedance element in the positional relationship shown in FIG. 6 is a graph showing a change in the graph. As shown in FIG. 3A, the magneto-impedance element 100a is a Co-Zr
The conductor coil 102a is linked to the amorphous thin film 101a made of -Nb-Ta. Like the first magnetic layer 1 (FIG. 1), the magneto-impedance element 100a is arranged in the external magnetic field such that its easy axis 103a is parallel to the direction of the magnetic flux 104 of the external magnetic field. A carrier signal is supplied to the conductor coil 102a. As shown in FIG. 3B, the magneto-impedance element 100b
Is an amorphous thin film 101b composed of Co-Zr-Nb-Ta
And the conductor coil 102b is linked. The magneto-impedance element 100b has an axis of easy magnetization 103b having a magnetic flux 104 of an external magnetic field, similarly to the second magnetic layer 2 (FIG. 1).
Are arranged in the external magnetic field so as to be orthogonal to the direction of. A carrier signal is supplied to the conductor coil 102b. Then, the impedance of the magnetic impedance elements 100a and 100b was measured by an impedance analyzer while changing the magnitude of the external magnetic field using a solenoid coil (not shown). The rate of change dZ of the magnetic impedance is Z when the magnetic flux flows through the magnetic impedance element and Z when the magnetic flux does not flow through the magnetic impedance element.
If it is set to 0, it is represented by the following equation (1). dZ = 100 * (Z0−Z) / Z0 (1)

As a result, as shown in FIG. 4, the frequency of the carrier signal of the current supplied to the conductor coil 102a is 2
In the case of MHz, the rate of change of the impedance of the magneto-impedance element 100a in response to the change of the external magnetic field is indicated by the dotted line in the figure, and the maximum rate of change was 26%. When the frequency of the carrier signal was 235 MHz, the rate of change of the impedance was indicated by a solid line in the figure, and the maximum rate of change was 53%. Further, in the magnetic impedance element 100a, the gradient of the rate of change of the impedance, that is, the sensitivity becomes extremely large when the external magnetic field is around 6 Oe. Specifically, when the frequency of the carrier signal is 2 MHz, the sensitivity is 22% per Oersted, and the frequency of the carrier signal is 2 MHz.
At 35 MHz, sensitivity is 53% per Oersted
Met. On the other hand, as shown by the solid line in FIG. 5, even when the carrier signal having the largest impedance change rate is 225 MHz, the maximum change rate of the magnetic impedance element 100b is 17 % And the sensitivity was 1% per Oersted. When the frequency of the carrier signal indicated by the dotted line in the figure is 2 MHz, the maximum rate of change of the impedance is 8%, and the sensitivity is 0.1% per Oersted.
4%. The above experiment has revealed that the magneto-impedance element 100a in which the easy axis 103a is arranged in parallel with the magnetic flux 104 of the external magnetic field has the following features (1) and (2). . (1) The sensitivity per Oersted is as high as 50% or more. (2) It can be used at a carrier signal frequency of several MHz.

Based on the above experiment, in the magnetic head 10 of the present embodiment, the axis of easy magnetization of the amorphous thin film made of Co—Zr—Nb—Ta is set to the direction of the recording magnetization of the perpendicular magnetic recording medium,
The first magnetic layer 1 is oriented so as to be parallel to the conductor wire 3. Further, in order to prevent the recording magnetization of the perpendicular magnetic recording medium from being erased by the leakage magnetic flux from the first magnetic layer 1 at the time of reproduction, the protruding portion 2a close to the perpendicular magnetic recording medium has an easy axis of magnetization perpendicular to the perpendicular magnetic recording medium. The magnetic recording medium was composed of a second magnetic layer 2 orthogonal to the direction of recording magnetization.

The magnetic head manufacturing Next, a specific manufacturing method of the magnetic head 10 will be described with reference to FIG. FIG. 6 is an explanatory diagram showing a manufacturing process of the magnetic head shown in FIG. First, FIG.
As shown in FIG. 5, an alumina / titanium carbide (AlTiC) substrate 31 having an alumina film mirror-finished on its surface is coated with Co.
The first magnetic layer 1 is formed by sputtering an amorphous alloy made of -Zr-Nb-Ta. Subsequently, as shown in FIG. 6B, the alumina / titanium carbide substrate 31 and the first magnetic layer 1 are heated in a static magnetic field (for example, 1
00 Oe, 300 ° C.) to form the first magnetic layer 1
Is oriented in a predetermined direction. Then the first
The first magnetic layer 1 is formed into a predetermined shape by performing an ion milling process on the magnetic layer 1. The surface of the first magnetic layer 1 is formed flat. Next, as shown in FIG. 6C, an ion milling process is performed after forming a SiO ₂ film by sputtering,
A first insulating layer 6 a having a predetermined shape is formed on the first magnetic layer 1. Then, the conductor wire 3 is formed on the first insulating layer 6a by patterning into a predetermined shape by dry or chemical etching after sputtering a Cu thin film or the like. The conductor wire 3 is formed in a direction orthogonal to the easy axis 4 of the first magnetic layer 1. After that, similarly to the first insulating layer 6a, the second insulating layer 6b is formed so as to cover the conductor wire 3. Thereby, the insulating film 6
(FIG. 1) is formed of the first insulating layer 6a and the second insulating layer 6b. Subsequently, as shown in FIG.
As in the case of the magnetic layer 1, the amorphous axis composed of Co—Zr—Nb—Ta is sputtered in a static magnetic field so that the easy axis 5 of the second magnetic layer 2 is magnetized. The second magnetic layer 2 is formed while being oriented in a direction orthogonal to the easy axis 4. Then, ion milling is performed on the second magnetic layer 2 to form the second magnetic layer 2 into a predetermined shape. In this manner, the second magnetic layer 2, the conductor wire 3, and the insulating film 6 are formed on the flat first magnetic layer 1, and the magnetic head 10 is manufactured.

It should be noted in this manufacturing method that the first and second insulating layers 6a and 6b are formed smaller than the first magnetic layer 1. The reason is that a magnetic gap is not formed by the first and second insulating layers 6a and 6b on the surface of the magnetic core. If a magnetic gap is formed, the magnetic flux of the recording magnetization from the magnetic recording medium during reproduction is
Leaks through the magnetic gap. Therefore, the first magnetic layer 1
Is magnetized, the amount of magnetic flux guided to the first magnetic layer 1 via the second magnetic layer 2 decreases, that is, a loss of magnetic flux occurs. As a result, the reproduction efficiency of the magnetic head 10 is reduced. During reproduction, a magnetic flux is generated inside the first and second magnetic layers 1 and 2 by the current flowing through the conductor wire 3. This is because, when the magnetic gap is formed, the magnetic flux leaks from the magnetic gap to the outside of the magnetic head 10, and the leaked magnetic flux may magnetize the magnetic recording medium. Further, since the magnetic core of the magnetic head 10 is composed of the first magnetic layer 1 and the second magnetic layer 2, the impedance change in the conductor wire 3 is not changed by the first magnetic layer 1 and the second magnetic layer. Both are affected. In order to improve the read sensitivity of the recorded magnetization, it is sufficient that the change in the magnetic permeability of the first magnetic layer 1 corresponds to the change in the impedance of the conductor wire 3. For this reason, it is desirable to form the second magnetic layer 2 thinner than the first magnetic layer 1.

As described above, the magnetic head 10 of the present invention
Unlike the composite type thin film magnetic head using the conventional MR head, there is no need to provide a magnetic gap and a shield layer especially for reproduction. As a result, the magnetic head 10 can have a simpler configuration than that using the MR head.
In addition, since the magnetic head 10 constitutes a magnetic flux responsive reproducing head that directly uses the magnetic flux of the recording magnetization, the reproducing sensitivity can be made superior to that of the conventional inductive head. In addition, since the frequency of the carrier signal can be used at several MHz, a stable operation can be performed by the reproduction signal detection circuit 25 connected to the magnetic head 10.

<< Second Embodiment >> FIG. 7 is a perspective view showing a magnetic head according to a second embodiment of the present invention. FIG. 8 is an explanatory diagram showing a manufacturing process of the magnetic head shown in FIG. In this embodiment, in the configuration of the magnetic head,
The first magnetic layer was provided on the second magnetic layer having a flat surface. The other points are the same as those shown in the first embodiment, and the duplicated description thereof will be omitted. The main difference from the first embodiment is that the first magnetic layer 1 ', the conductor wire 3, and the insulating film 6 are provided on the second magnetic layer 2'.
That is, as shown in FIG. 7, a magnetic head 10 ′ includes a first magnetic layer 1 ′ constituting a magnetic core, a second magnetic layer 2 ′ having a flat surface, and a predetermined current flowing through the magnetic core. Has a conductor wire 3 for supplying The first magnetic layer 1 'and the second magnetic layer 2' are formed of an amorphous thin film made of Co-Zr-Nb-Ta. One example of a preferable composition of this amorphous thin film is Co 87%, Zr 5.5
%, Nb 3%, and Ta 4.5%. The thickness of the first magnetic layer 1 ′ is, for example, 1 μm, and the thickness of the second magnetic layer 2 ′ is, for example, 0.2 μm.

The method of manufacturing the magnetic head 10 'is performed according to the following procedure. First, as shown in FIG. 8A, an alumina film having an alumina film mirror-finished on the surface is used.
On a titanium carbide (AlTiC) substrate 31, Co—Zr—
A second magnetic layer 2 'is formed by sputtering an Nb-Ta amorphous alloy. Subsequently, as shown in FIG. 8B, the alumina / titanium carbide substrate 31 and the second magnetic layer 2 ′ are heated in a static magnetic field (for example,
(100 Oe, 300 ° C.) to orient the easy axis 5 of the second magnetic layer 2 ′ in a predetermined direction. afterwards,
The second magnetic layer 2 'is formed into a predetermined shape by performing an ion milling process on the second magnetic layer 2'. Note that the surface of the second magnetic layer 2 'is formed flat. Next, as shown in FIG. 8C, the first insulating layer 6a having a predetermined shape is formed by performing ion milling after forming the SiO ₂ film by sputtering, thereby forming the second magnetic layer 2 ′. Form on top. Then, the conductor wire 3 is formed on the first insulating layer 6a by patterning into a predetermined shape by dry or chemical etching after sputtering a Cu thin film or the like. This conductor wire 3 is
Is formed so as to be parallel to the easy axis 5 of the magnetic layer 2 ′. After that, similarly to the first insulating layer 6a, the second insulating layer 6b is formed so as to cover the conductor wire 3. This allows
An insulating film 6 (FIG. 7) is formed by the first insulating layer 6a and the second insulating layer 6b. Subsequently, as shown in FIG. 8 (d), similarly to the first magnetic layer 1, an amorphous alloy made of Co—Zr—Nb—Ta is sputtered in a static magnetic field, so that the first magnetic layer is formed. The first magnetic layer 1 'is formed while the easy axis 4 of the layer 1' is oriented in a direction orthogonal to the easy axis 5 of the second magnetic layer 2 '. Then, the first magnetic layer 1 'is formed into a predetermined shape by performing ion milling on the first magnetic layer 1'. In this manner, the first magnetic layer 1 ', the conductor wire 3, and the insulating film 6 are formed on the second magnetic layer 2', and the magnetic head 10 'is manufactured. In this embodiment, since the surface of the second magnetic layer 2 'is configured to be flat, it is easy to make the thickness of the second magnetic layer 2' thinner than that of the first embodiment. Can be. As a result, the reproduction sensitivity can be easily improved as compared with the first embodiment.

The method of manufacturing the magnetic head and the materials of the constituent members shown in the above two embodiments are not limited to those described above. For example, the first and second magnetic layers may be formed of a NiFe alloy, another Co-based amorphous film, or may be formed of an Fe-based thin film. Further, in addition to the formation of a thin film using sputtering, a thin film forming method such as an evaporation method or plating may be used. further,
The first magnetic layer and the second magnetic layer may be configured using different amorphous films. Further, the magnetic cores are first and second.
Not only the above magnetic layer but also a larger number of magnetic layers to form a multilayer structure makes it possible to improve the magnetic permeability of the magnetic head in a high frequency region.

<< Third Embodiment >> FIG. 9 is an explanatory diagram showing a main part of a magnetic disk drive according to a third embodiment of the present invention. FIG. 10 is a block diagram showing a reproducing circuit of the magnetic disk device shown in FIG. In FIG. 9, the magnetic head 40 is the same as the magnetic head 10 shown in the first embodiment.
Is the same as The magnetic head 40 is installed on a head slider (not shown) or the like, and is arranged on a recording surface of a disk-shaped perpendicular magnetic recording medium 35. In the magnetic head 40, the axis of easy magnetization 44 of the first magnetic layer 41
Are oriented so as to be parallel to the direction of the recording magnetization 36 of the perpendicular magnetic recording medium 35. Also, the second magnetic layer 42
Is oriented so as to be orthogonal to the direction of the recording magnetization. Further, the conductor wire 43 is insulated and arranged so as to penetrate the magnetic core including the first magnetic layer 41 and the second magnetic layer 42. At both ends of the conductor wire 43, electrode terminals 43a and 43b are provided. The conductor wire 45 is supplied with a low alternating current, which is a carrier signal, and a very small direct current for bias-magnetizing the first magnetic layer 41 in one direction. The perpendicular magnetic recording medium 35 is a so-called perpendicular recording medium having an easy axis of magnetization in the perpendicular direction. The perpendicular magnetic recording medium 35
Is a 1 μm thick CoZrTa film as a recording layer on a glass disk having a very smooth surface,
It has a two-layer structure in which a 1 μm CoCrTa film is deposited. The diameter of the perpendicular magnetic recording medium 35 is 25 mm,
Information is already recorded on the recording surface. In the magnetic reproducing apparatus of this embodiment, the disk-shaped perpendicular magnetic recording medium 35 is rotated in the direction of arrow A in FIG. 9 by a spindle motor or the like, and the magnetic head 40 flies above the perpendicular magnetic recording medium 35 while recording information. Perform playback.

As shown in FIG. 10, the magnetic disk drive comprises a magnetic head 4 having a magnetic impedance element 51.
0, a carrier signal generator 55 connected to terminals 52 and 53 of the magnetic head 40, and a reproduction signal detection circuit 56;
A reproduction signal processing circuit 58 connected to a reproduction signal detection circuit 56 via a reproduction amplifier 57; The magneto-impedance element 51 is connected to the conductor line 43 of the magnetic head 40 (FIG. 9).
Are equivalently shown, and the terminals 52 and 53 correspond to the electrode terminals 43a and 43b shown in FIG. 1, respectively.
The carrier signal generator 55 includes a carrier signal oscillation circuit,
It is composed of a constant current drive circuit and a direct current drive circuit (not shown). The carrier signal oscillation circuit and the constant current drive circuit connect the electrode terminals 52 and 53 during reproduction.
A constant current of an alternating current which is a carrier signal is supplied to the magnetic impedance element 51 through the. The DC current drive circuit supplies a minute DC current to the conductor line 43 (FIG. 9) via the electrode terminals 52 and 53 in order to generate a bias magnetic field during reproduction. In the magnetic disk drive of this embodiment, the frequency of the carrier signal is 2 MHz, and the direct current for bias magnetization is 2 mA. The reproduction signal detection circuit 56 includes an AM detection circuit and an AM demodulation circuit (not shown). The AM detection circuit has an electrode terminal 5
AM wave (Amplitude Mo) generated between the electrode 2 and the electrode terminal 53
dulation) signal. The AM demodulation circuit is provided by the A
The AM wave detected by the M detection circuit is demodulated and output as a reproduced signal. The reproduction amplifier 57 includes a reproduction signal detection circuit 5
In step 6, the reproduced signal demodulated is amplified. The reproduction signal processing circuit 58 converts the reproduction signal amplified by the reproduction amplifier 57 into a signal suitable for output by performing, for example, code demodulation, and outputs the signal from an output terminal 59 to a display device or the like.

Next, the reproducing operation of the magnetic disk device of the present embodiment will be described with reference to FIGS.
As shown in FIG. 9, when the magnetic head 40 scans over the recording magnetization 36 of the perpendicular magnetic recording medium 35, the second magnetic layer 42
Through the first magnetic layer 41, the leakage magnetic flux from the recording magnetization 36 passes. The first magnetic layer 41 is magnetized by the magnetic flux, and the magnetic permeability decreases. On the other hand, as shown in FIG.
0 is supplied with a carrier signal of 2 MHz from the carrier signal generator 55 shown in FIG.
A voltage V that varies depending on the current of the carrier signal is generated between b. The voltage V is determined by the impedance Z between the electrode terminals 43a and 43b based on the relational expression of V = ZI (where I is constant). This impedance Z is proportional to the magnetic permeability of the first magnetic layer 41, and when the magnetic permeability of the first magnetic layer 41 decreases, the impedance Z also decreases. That is, if the leakage magnetic field from the perpendicular magnetic recording medium 35 is large, the impedance Z becomes small, and if the leakage magnetic field is small, the impedance Z becomes large. For example, the magnetic head 4
When the leakage magnetic field of the perpendicular magnetic recording medium 35 detected at 0 fluctuates in the range of -a to + a as shown by the curve 60 in FIG. 11, the value of the impedance Z becomes the curve 61 in FIG. As shown in (1), it fluctuates according to the change in the leakage magnetic field. That is, when the external magnetic field Hext, which is a leakage magnetic field from the perpendicular magnetic recording medium 35, is 0, the impedance Z takes a large value b2. When the external magnetic field Hext is -a or + a, the impedance Z Z
Takes a small value b2. The signs of-and + indicate the direction of the leakage magnetic field.

As described above, the value of the impedance Z is inversely proportional to the strength of the leakage magnetic field of the recording magnetization 36, but is independent of the polarity of the recording magnetization 36. That is,
If the amount of magnetic flux passing through the magnetic core is the same, the electrode terminal 4
The voltage V generated between 3a and 43b has the same magnitude. For this reason, the recording magnetization 36 cannot be reproduced with any signal processing as it is. Therefore, in the disk device of the present embodiment, the first of the magnetic cores is changed so that the value of the impedance Z changes depending on the polarity of the recording magnetization 36.
The magnetic layer 41 (FIG. 9) is bias-magnetized in one direction. Specifically, as described above, a minute DC current is supplied from the carrier signal generator 55 (FIG. 10) to the conductor line 43 (FIG. 9) to bias the first magnetic layer 41 in one direction. Magnetized. As a result, the voltage V changes according to the polarity of the recording magnetization 36. For example, when a bias magnetic field having a magnitude and polarity of d and-is applied to the magnetic core, the relationship between the external magnetic field Hext and the impedance Z is shown by a curve 62 in FIG. Comparing the curve 62 in FIG. 13 with the curve 61 in FIG. 12, it can be seen that the curve 62 is shifted to the right as compared to the curve 61 by the bias magnetic field d. That is, when the external magnetic field Hext is -a, the value of the impedance Z takes the minimum value c3. Also,
When the external magnetic field Hext is 0, the value of the impedance Z takes an intermediate value c2, and when the external magnetic field Hext is + a, the value of the impedance Z takes a maximum value c1. Thus, the value of the impedance Z can be adjusted by applying a bias magnetic field.
It reflects the polarity of the external magnetic field Hext, and uses the voltage V generated between the electrode terminals 43a and 43b to make the recording magnetization 36
Can be reproduced.

Since the magnetic head 40 scans over the recording magnetization 36 having different polarities and lengths one after another, the change in the voltage V generated between the electrode terminals 43a and 43b is 2 MHz.
An AM wave having the carrier signal of the carrier as a carrier. This AM wave is demodulated as a reproduction signal in the reproduction signal detection circuit 56 and output to the reproduction amplifier 57. The reproduction amplifier 57 amplifies the demodulated reproduction signal and outputs it to the reproduction signal processing circuit 58. The reproduction signal processing circuit 58 converts the reproduction signal into a signal suitable for output, and outputs the signal from an output terminal 59. Thus, the magnetic disk drive of the present embodiment
The information recorded on the perpendicular magnetic recording medium 35 is reproduced by using the magnetic flux response type magnetic impedance element 51. For this reason, the reproduction sensitivity of the reproduction signal can be improved as compared with the conventional induction type head. By adjusting the frequency of the carrier signal from 500 KHz to 10 MHz, the processing of the reproduction signal in the reproduction signal detection circuit 56, the reproduction amplifier 57, and the reproduction signal processing circuit 58 can be facilitated.

<< Fourth Embodiment >> FIG. 14 is an explanatory diagram showing a main part of a magnetic disk drive as a fourth embodiment embodying the present invention. 14, a magnetic head 70 includes a magnetic core 71, a coil 72 wound around the magnetic core 71, and a magnetic impedance element 75 built in the magnetic core 71.
And The magnetic head 70 is a composite type thin film magnetic head, and uses a magnetic core 71 and a coil 72 for recording information, and uses a magnetic core 71 and a magnetic impedance element 75 for reproducing information. The magnetic core 71 is made of, for example, a NiFe alloy, and its easy axis 73 is oriented so that the direction of the magnetic flux 74 flowing through the magnetic core 71 is orthogonal to the magnetic core 71.
On the surface of the magnetic core 71, a magnetic gap 71a facing the recording surface of the magnetic recording medium 80 is provided. The coil 72 is formed of a Cu thin film or the like, and a predetermined alternating current is supplied from a drive circuit (not shown). Glass or the like is provided between the magnetic core 71 and the coil 72 in order to improve the strength of the magnetic head 70. The magnetic recording medium 80 is a so-called in-plane recording magnetic recording medium having an easy axis 81 in the plane. In the magnetic recording storage medium 80, a CoNiCr film having a thickness of 0.03 μm is formed as a recording layer on a glass disk having a very smooth surface, and its diameter is 25 mm.

The magnetic impedance element 75 is made of Co-Zr-
Magnetic core 7 formed of an amorphous film made of Nb-Ta
6 and a conductor wire 77 formed of a Cu thin film or the like. The magnetic core 76 and the conductor wire 77 correspond to, for example, the first magnetic layer 1 (FIG. 1) and the conductor wire 3 (FIG. 1) shown in the first embodiment, respectively. The magnetic impedance element 75 is disposed in the magnetic core 71 of the magnetic head 70 such that the easy axis 79 of the magnetic core 76 and the magnetic flux 74 flowing in the magnetic core 71 are parallel to each other. The conductor wire 77 is arranged so as to penetrate the magnetic core 76 in a direction perpendicular to the easy axis 79 of the magnetic core 76. An insulating film 78 is formed between the magnetic core 76 and the conductor wire 77, and electrically insulates the magnetic core 76 from the conductor wire 77. At both ends of the conductor wire 77, electrode terminals (not shown) for passing a carrier signal and a bias current through the conductor wire 77 are provided. still,
These electrode terminals are, for example, the electrode terminals 5 shown in FIG.
2,53.

In the magnetic disk drive of the present embodiment, the disk-shaped magnetic recording medium 80 is rotated by a spindle motor or the like, and the magnetic head 70 is arranged on the magnetic recording medium 80 to record and reproduce information. The magnetic head 70 is mounted on a head slider (not shown), and moves on the magnetic recording medium 80 by an actuator (not shown). When the magnetic head 70 records information on the magnetic recording medium 80, a method is used in which an alternating current is passed through the coil 72 to generate a magnetic field in the magnetic gap 71a, as in the case of the conventional induction type head. When the magnetic head 70 reproduces information from the magnetic recording medium 80, the change in the magnetic permeability of the magnetic core 76 of the magnetic impedance element 75 corresponding to the change in the magnetic flux 74 of the recorded information flowing through the magnetic core 71 is determined by a conductor line. It is detected by a change in the voltage generated at both ends of 77. Then, the change in the voltage is converted into a reproduction signal by the reproduction signal detection circuit 56 shown in FIG. 10 and output. As described above, in the magnetic disk drive of this embodiment, the conventional inductive head is used for recording information, and the magnetic impedance element 75 is used for reproducing information. Therefore, it is not necessary to provide a magnetic gap and a shield layer especially for reproduction unlike the conventional composite type thin film magnetic head using the MR head. As a result, the magnetic head 70 can have a simpler configuration than that using the MR head. The magnetic head 7
Numeral 0 constitutes a magnetic flux response type reproducing head that directly uses the magnetic flux of the recording magnetization, and thus the reproducing sensitivity can be made superior to that of the conventional induction type head. Further, since the frequency of the carrier signal can be used at several MHz, a stable operation can be performed by the reproduction signal detection circuit 56 connected to the magnetic head 70 and the like.

<< Fifth Embodiment >> FIG. 15 is an explanatory view showing a main part of a magnetic disk drive according to a fifth embodiment of the present invention. In this embodiment, a magnetic head for recording and reproducing information on a so-called perpendicular recording magnetic recording medium having an easy axis of magnetization in the perpendicular direction was constructed. The other points are the same as those shown in the fourth embodiment, and thus the duplicated description thereof will be omitted. The main difference from the fourth embodiment is that the first magnetic core and the second magnetic core constitute the magnetic core of the magnetic head, and the magnetic impedance element is incorporated in the first magnetic core. That is, as shown in FIG. 15, the magnetic head 85 is wound around a first magnetic core 86a, a second magnetic core 86b magnetically coupled to the first magnetic core 86a, and a second magnetic core 86b. Coil 72,
And a magneto-impedance element 75 built in the first magnetic core 86a. The magnetic head 85 is a composite thin-film magnetic head. The first and second magnetic cores 86a and 86b and the coil 87 are used for recording information, and the first magnetic core 86a and the magnetic impedance element 75 are used for reproducing information. Is used. The first and second magnetic cores 86a and 86b are formed of, for example, a NiFe alloy, and their easy axes are oriented so that the directions of magnetic fluxes 88 flowing in the first and second magnetic cores 86a and 86b are orthogonal to each other. ing. The first and second magnetic cores 86a and 86b are joined and magnetically coupled to each other at a portion opposite to each surface facing the recording surface of the magnetic recording medium 90. The coil 87 is formed of a Cu thin film or the like, and a predetermined alternating current is supplied from a drive circuit (not shown). The first magnetic core 86a and the second in which the coil 87 is wound
In order to improve the strength of the magnetic head 85, an insulating layer 89 of glass or the like is provided between the magnetic core 86b. The magnetic recording medium 90 is a magnetic recording medium in which the easy axis 91 is oriented in the vertical direction. The magnetic recording medium 90 has a two-layer structure in which a 1 μm-thick CoZrTa film is formed as a recording layer on a glass disk having a very smooth surface, and a 0.1 μm-thick CoCrTa film is formed thereon. , Its diameter is 25 mm. The magnetic impedance element 75 is the same as that shown in the sixth embodiment, and flows into the easy axis 79 (FIG. 14) of the magnetic core 76 (FIG. 14) and the first magnetic core 86a. The magnetic head 88 is arranged in the first magnetic core 86a of the magnetic head 85 so as to be parallel to each other.

In the magnetic disk device of this embodiment, a disk-shaped magnetic recording medium 90 is rotated by a spindle motor or the like, and a magnetic head 85 is arranged on the magnetic recording medium 90 to record and reproduce information. The magnetic head 85 is mounted on a head slider (not shown), and moves on the magnetic recording medium 90 by an actuator (not shown). When the magnetic head 85 records information on the magnetic recording medium 90, an AC current is applied to the coil 87 to generate a magnetic field from the surface of the second magnetic core 86b as in the case of the conventional induction type head. When the magnetic head 85 reproduces information from the magnetic recording medium 90, the first magnetic core 8
A change in the magnetic permeability of the magnetic core 76 (FIG. 14) of the magnetic impedance element 75 corresponding to a change in the magnetic flux 88 of the recorded information flowing through 6a is detected by a change in voltage generated at both ends of the conductor wire 77 (FIG. 14). Then, the change in the voltage is converted into a reproduction signal by the reproduction signal detection circuit 56 shown in FIG. 10 and output.

The material of the magnetic core and the like is not limited to those described here. For example, the magnetic core 71 may be formed of another Co-based amorphous film or an Fe-based thin film. Further, the magnetic core of the magnetic head and the magnetic core of the magnetic impedance element may be formed of the same material. Further, in the magnetic impedance element, if the axis of easy magnetization of the magnetic core is arranged in parallel with the magnetic flux flowing in the magnetic core of the magnetic head, the same effect as in the above embodiment can be obtained.

[0039]

According to the magnetic head of the present invention, conductors are insulated and arranged in a direction perpendicular to the axis of easy magnetization of the magnetic material in the magnetic core composed of at least one magnetic material. By arranging this magnetic head in a magnetic field from a magnetic recording medium and supplying at least a high-frequency current to a conductor, a magnetic flux for reproducing recorded magnetization with excellent reproduction sensitivity without providing a magnetic gap and a shield layer, etc. A responsive read head can be obtained.

Further, according to the magnetic head of another invention,
A magnetic core comprising a first magnetic body having an easy axis oriented in parallel with a magnetization direction of a magnetic recording medium and a second magnetic body having an easy axis oriented in a direction orthogonal to the easy axis. Is composed. By placing the magnetic head in a magnetic field from a magnetic recording medium and supplying at least a high-frequency current to the conductor, a magnetic flux response that reproduces recorded magnetization with excellent reproduction sensitivity without providing a magnetic gap and a shield layer, etc. A type of reproducing head can be obtained.

Further, according to the magnetic head of another invention,
The protrusion disposed close to the magnetic recording medium is made of a second magnetic body having an easy axis of magnetization oriented in a direction orthogonal to the direction of the recording magnetization of the magnetic recording medium. Thus, it is possible to prevent the recording magnetization of the magnetic recording medium from being erased by the leakage magnetic flux from the first magnetic body.

Further, according to the magnetic head of another invention,
The thickness of the second magnetic body is formed to be smaller than the thickness of the first magnetic body. Thus, the sensitivity of the reproduced signal can be improved.

According to the method of manufacturing a magnetic head of the present invention,
By heating in a static magnetic field, the axis of easy magnetization of the first magnetic material is oriented in a predetermined direction, and by forming a film in a static magnetic field, the axis of easy magnetization of the second magnetic material is set in the first magnetic material. It is oriented in a direction perpendicular to the axis of easy magnetization of the body. With this configuration, it is possible to manufacture a magnetic flux responsive reproducing head that reproduces recorded magnetization without providing a magnetic gap, a shield layer, and the like.

Further, according to the method of manufacturing a magnetic head of another invention, by heating in a static magnetic field, the easy axis of the second magnetic body is oriented in a predetermined direction, and the film is formed in the static magnetic field. By doing so, the easy axis of magnetization of the first magnetic body is oriented in a direction orthogonal to the easy axis of magnetization of the second magnetic body. With this configuration, it is possible to manufacture a magnetic flux responsive reproducing head that reproduces recorded magnetization without providing a magnetic gap, a shield layer, and the like.

According to the magnetic disk drive of the present invention, the first magnetic body having the easy axis oriented in parallel with the magnetization direction of the magnetic recording medium, and the magnetization oriented in the direction perpendicular to the easy axis are provided. The magnetic core is composed of the second magnetic body having an easy axis. Further, a conductor insulated in the magnetic core, a carrier signal oscillating means for applying a high-frequency signal to the conductor, and a bias magnetic field generating means for generating a bias magnetic field in the magnetic core are provided. With this configuration, it is possible to obtain a magnetic flux responsive reproducing head that reproduces recorded magnetization without providing a magnetic gap, a shield layer, and the like.

Further, according to the magnetic disk drive of another invention, the frequency of the high-frequency signal from the carrier signal oscillating means is set to 500 kHz to 10 MHz. Thus, the operation of the circuit connected to the magnetic head and processing the reproduced signal can be stabilized.

Further, according to the magnetic head of another invention,
An inductive head including at least a magnetic core and a coil, and the magnetic head according to claim 1 disposed in the magnetic core, wherein the axis of easy magnetization of the magnetic core of the magnetic head is the same as that of the inductive head. The magnetic head is arranged parallel to the direction of the magnetic flux flowing in the magnetic core. As a result, it is possible to obtain a composite thin-film magnetic head having excellent reproduction sensitivity and a simple configuration.

According to another aspect of the present invention, there is provided a magnetic disk drive having the magnetic head according to the ninth aspect. Thus, the configuration of the magnetic disk drive can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a magnetic head as a first example embodying the present invention.

FIG. 2 is a block diagram showing a reproducing circuit of a magnetic reproducing apparatus having the magnetic head shown in FIG.

3A is an explanatory diagram showing a positional relationship between an axis of easy magnetization of a magnetic impedance element and a magnetic flux of an external magnetic field, and FIG. FIG. 4 is an explanatory diagram showing another positional relationship between a magnetic field and a magnetic flux.

FIG. 4 is a graph showing a change in output of the magneto-impedance element in the positional relationship shown in FIG.

FIG. 5 is a graph showing a change in output of the magnetic impedance element in the positional relationship shown in FIG.

FIG. 6 is an explanatory view showing a manufacturing process of the magnetic head shown in FIG. 1;

FIG. 7 is a perspective view showing a magnetic head as a second example embodying the present invention.

FIG. 8 is an explanatory view showing a manufacturing process of the magnetic head shown in FIG. 7;

FIG. 9 is an explanatory diagram showing a main part of a magnetic disk device as a third example embodying the present invention.

10 is a block diagram showing a reproduction circuit of the magnetic disk device shown in FIG.

FIG. 11 is a graph showing a change in a leakage magnetic field of a magnetic recording medium.

FIG. 12 is a graph showing a relationship between an external magnetic field and impedance when no bias magnetic field is applied.

FIG. 13 is a graph showing a relationship between an external magnetic field and impedance when a bias magnetic field is applied.

FIG. 14 is an explanatory diagram showing a main part of a magnetic disk device as a fourth example embodying the present invention.

FIG. 15 is an explanatory diagram showing a main part of a magnetic disk device as a fifth example embodying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st magnetic layer 2 2nd magnetic layer 2a Projection 3 Conductor line 4 Easy axis of 1st magnetic layer 5 Easy axis of 2nd magnetic layer 22, 55 Carrier signal generator

 ──────────────────────────────────────────────────の Continued on the front page (72) Osamu Kusumoto, Inventor 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kazuo Yokoyama 1006 Kadoma Kadoma, Kadoma City, Osaka Pref.

Claims (10)

[Claims] 1. A magnetic core comprising at least one magnetic body, and an elongated conductor insulated within the magnetic core and supplied with at least a high-frequency signal. A magnetic head which is oriented in a direction perpendicular to a conductor. 2. A first magnetic body having an easy axis of magnetization oriented in a direction perpendicular to the surface of a magnetic recording medium; and a second magnetic body having an easy axis of magnetization oriented in a direction orthogonal to the easy axis of the first magnetic body. And a magnetic material perpendicular to the axis of easy magnetization of the first magnetic material, and
And a conductor to which at least a high-frequency signal is supplied, the conductor being insulated between the magnetic body and the second magnetic body. 3. A projection protruding from a lower end of the first magnetic body is provided at a lower end of the second magnetic body, and the projection is arranged close to the magnetic recording medium. The magnetic head according to claim 2, wherein 4. The magnetic head according to claim 2, wherein the thickness of the second magnetic body is smaller than the thickness of the first magnetic body. 5. A step of orienting the easy axis of the first magnetic body in a predetermined direction by heating in a static magnetic field, and forming a first insulating layer on the first magnetic body. A first insulating layer forming step, a conductor forming step of forming a conductor on the first insulating layer in a direction orthogonal to the easy axis of magnetization of the first magnetic body, and a second insulating layer on the conductor. Forming a second insulating layer, forming a second magnetic body on the second insulating layer, and changing the axis of easy magnetization of the second magnetic body in a static magnetic field to the easy magnetization of the first magnetic body. Forming the magnetic head while orienting it in a direction perpendicular to the axis. 6. A step of orienting a magnetization easy axis of a second magnetic body in a predetermined direction by heating in a static magnetic field, and forming a first insulating layer on the second magnetic body. A first insulating layer forming step; a conductor forming step of forming a conductor on the first insulating layer in a direction parallel to the easy axis of magnetization of the second magnetic body; and a second insulating layer on the conductor. Forming a second insulating layer; forming a first magnetic material on the second insulating layer, and changing an axis of easy magnetization of the first magnetic material in a static magnetic field to an easy magnetization of the second magnetic material. Forming the magnetic head while orienting it in a direction perpendicular to the axis. 7. A first magnetic body having an easy axis of magnetization oriented in a direction perpendicular to the surface of a magnetic recording medium, and a first magnetic body having an easy axis of magnetization oriented in a direction orthogonal to the easy axis of the first magnetic body. 2, the first magnetic body and the second magnetic body, which are perpendicular to the axis of easy magnetization of any one of the magnetic bodies, and between the first magnetic body and the second magnetic body. A conductor that is insulated, a carrier signal oscillating unit that applies a high-frequency signal to the conductor, and a bias magnetic field that generates a bias magnetic field in a magnetic core that includes the first magnetic body and the second magnetic body Means, and means for holding the magnetic recording medium so as to move relative to the magnetic core. 8. The frequency of the high-frequency signal is 500 kHz.
8. The magnetic disk drive according to claim 7, wherein the frequency is 10 MHz to 10 MHz. 9. An inductive head including at least a magnetic core and a coil, and disposed in the magnetic core.
A magnetic head comprising: a magnetic head according to any one of claims 1 to 3, wherein the axis of easy magnetization of the magnetic core of the magnetic head is arranged parallel to a direction of a magnetic flux flowing in the magnetic core of the inductive head. 10. A magnetic disk drive on which the magnetic head according to claim 9 is mounted.