JP2003123339A - Magneto-optical recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magneto-optical recording device, in which the high speed modulation of a magnetic field and the generation of a high DC magnetic field for reproduction can be efficiently performed in magnetic field modulation recording and operation is stabilized. SOLUTION: This device is provided with a magnetic head MH and an optical head PH and by moving the magnetic head and the optical head to a magneto-optical disk PMD which is a disk-like recording medium, information is recorded on or reproduced from the recording medium. The magnetic head MH is provided with a first coil 31 for generating a high frequency magnetic field when recording information and a second coil 32 for generating a DC magnetic field when reproducing information and the magnetic head MH is moved by a moving device 11 so that the first coil 31 can be located in a position corresponding to a magnetic domain area to be recorded on the recording medium when recording information and the second coil 32 can be located in a position corresponding to a magnetic domain area to be reproduced on the recording medium when reproducing information respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording apparatus that records or reproduces information on a recording medium using light and magnetism.

Magneto-optical recording device (magneto-optical disk device)
Since it is possible to increase the capacity by magnetic field modulation recording and is excellent in transfer speed and reliability, it is becoming popular as a main storage device of computers. Therefore, it is desired to develop a magnetic head and its peripheral mechanism that are efficient and stable in magnetic field modulation recording.

[0003]

2. Description of the Related Art FIG. 18 is a diagram showing the structure of a conventional magneto-optical recording apparatus 80. In FIG. 18, a disk-shaped magneto-optical disk PMD has a center portion rotatably fixed to the apparatus body by a magnet or the like, and rotates about an axis (not shown). An optical head PH is arranged on the lower surface of the magneto-optical disk PMD, and a magnetic head MHj is arranged on the upper surface. The magnetic head MHj applies a bias magnetic field required for recording and reproducing information to the magneto-optical disk PMD.

The optical head PH is moved in the radial direction of the magneto-optical disk PMD by a linear motor or the like. By rotating the magneto-optical disk PMD and moving the optical head PH, information is recorded at a predetermined address position on the magneto-optical disk PMD. A moving mechanism such as a linear motor in the magneto-optical recording device 80 is disclosed in Japanese Patent Laid-Open No. 5-2
Reference can be made to Japanese Patent No. 34174.

In the magneto-optical disk PMD, when the recording density becomes high and the mark (magnetic domain region) length becomes short, the magnetic field modulation recording is more advantageous than the optical modulation recording. In magnetic field modulation recording, a small and lightweight magnetic head is levitated on the surface of the magneto-optical disk PMD, and a current is applied to a coil to apply a magnetic field required for recording or reproduction. Magneto-optical disk P
There are several types of MDs, but among those compatible with magnetic field modulation recording, there are those that require a strong DC magnetic field of 300 Oersted or more during reproduction (for example, a magnetic super-resolution medium). On the other hand, at the time of recording, high-speed modulation of the magnetic field is required, and it is very difficult to achieve both of them.

Conventionally, it has been proposed to attach a recording magnetic head, a reproducing magnetic head, an initializing magnetic head, a balancing magnetic head and the like to one yoke or individually (Japanese Patent Laid-Open No. H10 (1998) -109522). -14
9596).

Further, in Japanese Unexamined Patent Publication No. 6-68402, a coil for canceling the leakage magnetic field is installed coaxially above the magnetic head, and the influence of the leakage magnetic field which the magneto-optical disk wraps around from the surroundings. There is disclosed a magneto-optical recording device which is protected from being received.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the apparatus of No. 149596, a plurality of magnetic heads are provided, but any one of the magnetic heads is deviated from the mark of the magneto-optical disk, which causes a problem in efficiency and stability in recording or reproducing information. Remains.

Further, in the device of Japanese Patent Laid-Open No. 6-68402, the added coil is intended to cancel a minute leakage magnetic field of about several tens oersteds, and is necessary for reproducing a magneto-optical disk on which magnetic field modulation recording is performed. It is not suitable for obtaining a high magnetic field.

It is also possible to dispose a reproducing head separately from the conventional magnetic head in a state where the conventional magnetic head is not retracted and to apply a reproducing magnetic field by the reproducing head. However, according to this, when the reproducing head is close to the magnetic head, the magnetic head is attracted to the reproducing head by applying the reproducing magnetic field, and when the reproducing head is separated from the magnetic head, the magnetic head is There is a risk of hitting the surface of the magneto-optical disk.

The present invention has been made in view of the above-mentioned problems, and in magnetic field modulation recording, high-speed modulation of a magnetic field and generation of a high DC magnetic field for reproduction are efficiently performed, and a stable optical operation is performed. An object is to provide a magnetic recording device.

[0012]

According to one aspect of the present invention, a magneto-optical recording apparatus includes a magnetic head and an optical head, and the magnetic head and the optical head are moved with respect to a disk-shaped recording medium. As a result, information is recorded on the recording medium or the recorded information is reproduced. In the magnetic head, a first coil that generates a high-frequency magnetic field to be applied to the recording medium at the time of recording information, and a second coil that generates a DC magnetic field to be applied to the recording medium at the time of reproducing information. Is provided, and the magnetic head is
When the information is recorded, the first coil is located at a position corresponding to the magnetic domain region of the recording medium to be recorded, and at the time of reproducing the information, the second coil is located at a position corresponding to the magnetic domain region of the recording medium to be reproduced. Each is moved by a moving device so that it is located.

Preferably, the first coil and the second coil
The coils are provided at positions displaced from each other along the radial direction of the recording medium. Alternatively, the first coil and the second coil are provided at positions displaced from each other along the circumferential direction of the recording medium.

The magnetic head is supported by an arm rotatable about an axis so as to be movable in the circumferential direction along the surface of the recording medium, and the moving device is moved by an electromagnetic force. It is configured to rotate the arm.

Further, the magnetic head is supported by an arm which is movable in parallel by a guide member so as to be movable in the circumferential direction along the surface of the recording medium, and the moving device is moved by the electromagnetic force to move the arm. Is configured to translate.

According to another aspect of the present invention, in the magnetic head, a first coil for generating a high-frequency magnetic field to be applied to the recording medium at the time of recording information, and an outer circumference of the first coil are provided. A second coil that is concentrically arranged and that generates a DC magnetic field to be applied to the recording medium when reproducing information is provided. At the time of reproducing information, a current is applied to both the first coil and the second coil so as to generate a DC magnetic field in the same direction.

Preferably, at the time of recording information, a current is passed through the second coil so that the high frequency magnetic field generated by the first coil reduces an induced current flowing through the second coil.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a diagram showing a configuration of a magneto-optical recording apparatus 1 according to the present invention, and FIG. 2 is a plan view showing the vicinity of a magnetic head MH of the magneto-optical recording apparatus 1. , Fig. 3
4 is a plan view showing the configuration of the magnetic head MH, and FIG. 4 is a block diagram showing the configuration of the control device 50 of the magneto-optical recording apparatus 1.

In FIG. 1, a magneto-optical recording apparatus 1 includes a magneto-optical disk (recording medium) PMD, a magnetic head MH, an optical head PH including a lens L, a moving device 11 for moving the magnetic head MH, and a seek. In addition, the moving mechanism 12 for moving the whole of them is provided.

The magneto-optical disk PMD has a central portion rotatably fixed to the apparatus main body by a magnet or the like, and rotates about an axis (not shown). The optical head PH is arranged on the lower surface of the magneto-optical disk PMD, and the magnetic head MH is arranged on the upper surface. The magnetic head MH applies a magnetic field necessary for recording and reproducing information to the magneto-optical disk PMD.

As shown in FIGS. 2 and 3, the magnetic head MH comprises a slider 21, a first coil 31, a second coil 32, and a support arm 22. The first coil 31 and the second coil 32 are spaced apart from each other by a distance ST1 in the radial direction (direction of arrow M1 in the drawing) of the slider 21.
Attached to.

The first coil (recording coil) 31 generates a modulated high frequency magnetic field (bias magnetic field) to be applied to the magneto-optical disk PMD when recording information on the magneto-optical disk PMD. The first coil 31 has a relatively small inductance and can reverse the magnetic field at high speed.

The second coil (reproducing coil) 32 generates a DC magnetic field to be applied to the magneto-optical disk PMD when reproducing information. The second coil 32 has a relatively large inductance and can generate a strong magnetic field of about 300 to 400 Oersted.

The slider 21 is supported by a support arm 22 and floats a certain distance from the surface of the magneto-optical disk PMD as it rotates. As a result, the first coil 31 and the second coil 32 maintain a constant distance from the surface of the magneto-optical disk PMD during recording and reproduction.

The support arm 22 is made of a spring material or the like, and its base portion 22a is supported by the support portion 24 in the radial direction (arrow M).
It is movably supported in one direction). A permanent magnet is provided in the support portion 24, and a current is passed through the drive coil 23 attached to the base portion 22a of the support arm 22 to generate a driving force by electromagnetic force therebetween. This driving force causes the support arm 22 to move in the direction of arrow M1. The direction of the driving force is reversed in the normal and reverse directions depending on the direction of the current of the drive coil 23. That is, the moving unit 11 is configured by the support unit 24 and the drive coil 23. The moving device 11 is attached to the moving mechanism 12 by a suitable method. The permanent magnet of the support portion 24 may also serve as the permanent magnet of the moving mechanism 12.

The moving distance by the moving device 11 is the distance ST between the center of the first coil 31 and the center of the second coil 32.
Is equal to 1. The magnetic head MH is moved by the moving device 11
Thus, when the information is recorded, the first coil 31 is located at a position corresponding to a magnetic domain region (also referred to as a mark or a domain) to be recorded on the magneto-optical disc PMD, and the second coil is reproduced when the information is reproduced.
Coils 32 are moved to positions corresponding to the magnetic domain regions of the magneto-optical disk PMD to be reproduced.

That is, by the operation of the moving device 11,
At the time of recording or reproduction, the first coil 31 or the second coil 32 is in the magnetic domain region (that is, the optical head PH).
The position of the beam spot formed in 1) can be changed.

The magnetic head MH and the optical head PH supported by the moving device 11 are moved in the radial direction of the magneto-optical disk PMD by the moving mechanism 12 for seeking. As the moving mechanism 12, for example, a linear motor called VCM is used.

By rotating the magneto-optical disk PMD and moving the magnetic head MH and the optical head PH, information is recorded or reproduced at a predetermined address position of the magneto-optical disk PMD.

In FIG. 4, the control device 50 of the magneto-optical recording apparatus 1 comprises a control section 51, a high frequency output section 52, a DC output section 53 and the like. The high frequency output unit 52 modulates the high frequency current based on the information to be recorded on the magneto-optical disk PMD, and outputs the modulated high frequency current to the first coil 31. The DC output unit 53 outputs a DC current for generating a DC magnetic field of appropriate strength to the second coil 32. The configurations and functions of the high-frequency output unit 52 and the DC output unit 53 themselves are known.

The control device 50 controls the operations of the high frequency output section 52 and the DC output section 53 in accordance with recording or reproduction. Further, the moving device 11 is controlled such that the first coil 31 is used for recording and the second coil 32 is used for reproduction.
Switching is performed so as to correspond to the magnetic domain regions. Then, the entire mechanism including the moving mechanism 12 is controlled so that information is recorded at a predetermined address of the magneto-optical disk PMD and information is reproduced from the predetermined address.
Except for the control of the mobile device 11, the configuration and function of the control device 50 itself is known.

As described above, in the magneto-optical recording apparatus 1, the first coil 31 for recording and the second coil 32 for reproduction are provided.
Are provided independently of each other, and they are arranged at predetermined intervals in the radial direction of the magneto-optical disk PMD. Then, the magnetic head MH is moved in the radial direction to switch between the recording position and the reproducing position. Thereby, in magnetic field modulation recording, high-speed modulation of the magnetic field and generation of a high DC magnetic field for reproduction are efficiently performed,
Moreover, magneto-optical recording / reproducing with stable operation can be performed.

Although the magnetic head MH is moved by the moving device 11, it is possible to use the moving mechanism 12 originally provided without using the moving device 11 to move the magnetic head MH. . For example, during recording or reproduction, the first coil 31 or the second coil 31
The coils 32 are moved by the moving mechanism 12 so as to respectively correspond to the magnetic domain regions, and the optical system is controlled so that the spot of the laser light emitted from the optical head PH hits the magnetic domain regions. [Second Embodiment] Next, a magneto-optical recording apparatus 1B according to a second embodiment of the present invention will be described.

In the magneto-optical recording apparatus 1B of the second embodiment, the first coil 31 and the second coil 32 are arranged at a predetermined interval along the circumferential direction of the magneto-optical disk PMD, and It is different from the magneto-optical recording apparatus 1 of the first embodiment in that the slider 21 is moved along the circumferential direction. For other configurations, the magneto-optical recording device 1 shown in FIG.
The same as the control device 50 shown in FIG.

FIG. 5 shows a magneto-optical recording apparatus 1 according to the second embodiment.
FIG. 6 is a plan view showing the configuration of the magnetic head MHB of B, FIG. 6 is a front view showing the vicinity of the magnetic head MHB, and FIG.
It is a top view which shows the vicinity of HB.

As shown in FIG. 5, the first coil 3 is attached to the slider 21B provided at the tip of the support arm 22B.
The first and second coils 32 are attached to each other with a distance ST2 in the circumferential direction (direction of arrow M2 in the drawing).

As shown in FIGS. 6 and 7, the support arm 22B has a shaft 25 with respect to the support portion 24B of the moving device 11B.
It is rotatably supported around. A drive coil 23B is attached to the base of the support arm 22B.

By passing an electric current through the drive coil 23B, a driving force due to an electromagnetic force is generated between the drive coil 23B and the permanent magnet provided on the support portion 24B. This driving force causes the support arm 22B to rotate about the shaft 25. The rotation of the support arm 22B causes the slider 21B to move in the circumferential direction. The support arm 22B rotates counterclockwise or clockwise depending on the direction of the current of the drive coil 23B. Support part 24
B, the drive coil 23B, the shaft 25, and the like constitute the moving device 11B. The moving device 11B is attached to the moving mechanism 12 shown in FIG. The support 24
The permanent magnet of B may also be used as the permanent magnet of the moving mechanism 12.

As described above, in the magneto-optical recording apparatus 1B of the second embodiment, the first coil 31 for recording and the second coil 32 for reproduction are separately provided, and they are optically separated. The magnetic disks PMD are arranged at predetermined intervals in the circumferential direction. Then, by rotating the support arm 22B, the magnetic head MH is moved in the circumferential direction to switch between the recording position and the reproducing position. As a result, the same effect as that of the first embodiment can be obtained. Since the support arm 22B is supported by the shaft 25, the mechanism is simple.

In the magnetic head MHB described above, the support arm 22B is rotated about the axis 25, but the slider 2 is moved by moving the support arm 22B in parallel.
1 may be moved in the circumferential direction.

Next, such a modification of the second embodiment will be described. FIG. 8 is a front view showing the vicinity of the magnetic head MHBb of the modified example of the second embodiment, and FIG. 9 is a plan view showing the vicinity of the magnetic head MHBb.

As shown in these figures, the support arm 22
B is supported by the support member 24B of the moving device 11Bb by the guide members 26 and 27 so as to be movable in parallel along the direction of arrow M3 in FIG. A drive coil 23B is attached to the base of the support arm 22B.

By supplying a current to the drive coil 23B, a driving force by an electromagnetic force is generated between the drive coil 23B and the permanent magnet provided on the support portion 24B. This driving force causes the support arm 22B to move in the direction of arrow M3. by this,
The slider 21B moves in the circumferential direction. Support 24B,
The drive coil 23B, the guide members 26, 27, and the like constitute the moving device 11Bb.

According to this modification, the same effect as that of the second embodiment can be obtained. Moreover, since the slider 21B moves in parallel, there is an advantage that the postures of the first coil 31 and the second coil 32 with respect to the magneto-optical disk PMD do not change. [Third Embodiment] Next, a magneto-optical recording apparatus 1C according to a third embodiment of the present invention will be described.

In the magnetic head MHC of the magneto-optical recording apparatus 1C of the third embodiment, the second coil (for reproduction) 32C is used.
Are arranged concentrically on the outer circumference of the first coil (for recording) 31C. In the magnetic head MHC, the first coil 31
The center of C and the center of the second coil 32C coincide. Therefore, in the third embodiment, the moving devices 11 and 11B and the control therefor as in the first and second embodiments are unnecessary. Further, in the third embodiment, the waveform of the current passed through the first coil 31C and the second coil 32C is different from that of the other embodiments. Other configurations are similar to those of the first embodiment.

FIG. 10 is a plan view showing the structure of the magnetic head MHC of the magneto-optical recording apparatus 1C of the third embodiment, FIG. 11 is a front view of the magnetic head MHC shown in FIG. 10, and FIG. 12 is a magneto-optical recording apparatus 1C. FIG. 13 is a block diagram showing the configuration of the controller 50C of FIG. 13, FIG. 13 is a diagram showing a current waveform flowing in the coil at the time of recording, FIG. 14 is a diagram showing a current waveform flowing in the coil at the time of reproducing, and FIG. 15 is a state of the magnetic field by the magnetic head MHC. FIG. 16 is a diagram showing ideal recording states and reproduction waveforms, and FIG. 17 is a diagram showing recording states and reproduction waveforms when there is an influence of induced current.

As shown in FIGS. 10 and 11, the slider 21C provided at the tip of the support arm 22C includes
The first coil 31C and the second coil 32C are concentrically arranged and attached. The second coil 32C used here may be, for example, an air-core coil or a coil in which a wire is wound around the core. Support arm 22
C is attached to the moving mechanism 12 shown in FIG. 1 by a suitable method.

In FIG. 12, the control device 50C comprises a control unit 51C, a high frequency output unit 52, a DC output unit 53, and switching units 54 and 55. The high frequency output unit 52 and the DC output unit 53 have the same configuration and function as those in the first embodiment.

The switching units 54 and 55 switch so as to supply the output of the high frequency output unit 52 or the DC output unit 53 to the first coil 31C or the second coil 32C according to recording or reproducing. Each of the switching units 54 and 55 includes an adjusting circuit for adjusting the amplitude, the current value, the phase, or the like.

That is, during recording, as shown in FIG. 13, a square wave current CW is applied to the first coil 31C.
Is supplied to the second coil 32C and the first coil 3
A square wave current CR of appropriate amplitude is provided to cancel the induced current from 1C. Further, at the time of reproduction, as shown in FIG. 14, a DC current CR is supplied to the second coil 32C, and an appropriate value for generating a DC magnetic field in the same direction in the first coil 31C as well. DC current CW is supplied.

Here, the operation of these currents CW and CR will be described. At the time of recording, a square-wave high-frequency current shown in FIG. 15A flows through the first coil 31C. Originally, this current generates a high-frequency magnetic field having the same waveform as the current, and a magnetic domain MK is recorded on the track as shown in FIG. 16 (A). When this recording area is reproduced, a reproduced signal having a waveform as shown in FIG. 16B is obtained.

However, when a high-frequency current flows through the first coil 31C, the second coil 32C receives the high-frequency current shown in FIG.
The induced current flows as shown in. This induced current is
Has a differential waveform of the current flowing through the coil 31C, and its magnitude depends on the inductance of the coil. When the induced current flows through the second coil 32C, a magnetic field is generated by the induced current. Since this magnetic field has a direction opposite to that of the recording magnetic field generated by the first coil 31C, the recording magnetic field decreases, and has a waveform as shown in FIG. 15C, for example. Then, the magnetic field required for recording may be insufficient.
For example, this magnetic field makes the boundaries of the recorded magnetic domain regions unclear, as shown in FIG. When this is reproduced, as shown in FIG. 17B, the edges of the waveform of the reproduced signal are not sharpened, and the jitter increases, which causes a read error.

Therefore, as described above, the current CR that cancels the induced current generated in the second coil 32C is supplied. The waveform of the current CR at this time is the same as that of the first coil 31C, for example. The magnitude of the current CR depends on the mutual inductance of the two coils. The current CR applied to the second coil 32C cancels the induced current and the magnetic field for recording is not blunted, so that reliable and stable recording is performed.

At the time of reproduction, currents CR and CW flowing in both coils in the same direction increase the generated DC magnetic field, and even in the magneto-optical disk PMD which requires a large magnetic field at the time of reproduction, information of Regeneration is stable and reliable.

The controller 50C controls the operations of the high-frequency output section 52, the DC output section 53, and the switching sections 54 and 55 in response to recording or reproduction. Further, the whole including the moving mechanism 12 is controlled so that information is recorded or reproduced at a predetermined address of the magneto-optical disk PMD.

In the embodiment described above, the magneto-optical disk PMD is fixed inside the magneto-optical recording device,
Alternatively, it may be a portable one that can be easily attached and detached. Structure, shape, dimensions of the magnetic heads MH, MHB, CMHC or the magneto-optical recording devices 1, 1B, 1C as a whole or each part
The number, material, waveform of current, content or timing of control, etc. can be appropriately changed in accordance with the gist of the present invention.

[0057]

According to the present invention, there is provided a magneto-optical recording apparatus capable of efficiently performing high-speed modulation of a magnetic field and generation of a high DC magnetic field for reproduction in magnetic field modulation recording, and having stable operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a magneto-optical recording device according to the present invention.

FIG. 2 is a plan view showing the vicinity of a magnetic head of a magneto-optical recording apparatus.

FIG. 3 is a plan view showing a configuration of a magnetic head.

FIG. 4 is a block diagram showing a configuration of a control device of the magneto-optical recording device.

FIG. 5 is a plan view showing the configuration of a magnetic head of the magneto-optical recording device of the second embodiment.

FIG. 6 is a front view showing the vicinity of a magnetic head.

FIG. 7 is a plan view showing the vicinity of a magnetic head.

FIG. 8 is a front view showing the vicinity of a magnetic head of a modified example of the second embodiment.

FIG. 9 is a plan view showing the vicinity of a magnetic head.

FIG. 10 is a plan view showing the configuration of a magnetic head of the magneto-optical recording device of the third embodiment.

11 is a front view of the magnetic head shown in FIG.

FIG. 12 is a block diagram showing a configuration of a control device of the magneto-optical recording device.

FIG. 13 is a diagram showing a waveform of a current flowing through a coil during recording.

FIG. 14 is a diagram showing a waveform of a current flowing through a coil during reproduction.

FIG. 15 is a diagram showing a state of a magnetic field generated by a magnetic head.

FIG. 16 is a diagram showing ideal recording states and reproduction waveforms.

FIG. 17 is a diagram showing a recording state and a reproduction waveform when there is an influence of an induced current.

FIG. 18 is a diagram showing a configuration of a conventional magneto-optical recording device.

[Explanation of symbols]

1,1B, 1C Magneto-optical recording device 11, 11B, 11Bb moving device 12 Moving mechanism 22B Support arm (arm) 23B drive coil 26, 27 guide member 31,31C First coil 32, 32C second coil 50,50C controller 51C control unit 54, 55 switching unit MH, MHB, MHC magnetic head PH optical head PMD magneto-optical disk (recording medium)

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G11B 11/105 G11B 11/105 563R

Claims (7)

[Claims] 1. A magnetic head and an optical head are provided, and information is recorded on or reproduced from the recording medium by moving the magnetic head and the optical head with respect to a disk-shaped recording medium. A magneto-optical recording device for performing, comprising: a first coil for generating a high-frequency magnetic field for applying to the recording medium at the time of recording information in the magnetic head, and a direct current for applying to the recording medium at the time of reproducing information. A second coil for generating a magnetic field is provided, and in the magnetic head, the first coil is positioned at a position corresponding to a magnetic domain region to be recorded on the recording medium when recording information.
The magneto-optical recording device, wherein the second coil is moved by a moving device so as to be located at a position corresponding to a magnetic domain region of the recording medium to be reproduced at the time of reproducing information. 2. The magneto-optical recording apparatus according to claim 1, wherein the first coil and the second coil are provided at positions displaced from each other in the radial direction of the recording medium. 3. The magneto-optical recording apparatus according to claim 1, wherein the first coil and the second coil are provided at positions displaced from each other along the circumferential direction of the recording medium. 4. The magnetic head is supported by an arm rotatable about an axis so as to be movable in the circumferential direction along the surface of the recording medium, and the moving device is configured to move by the electromagnetic force. The magneto-optical recording device according to claim 3, wherein the magneto-optical recording device is configured to rotate the arm. 5. The magnetic head is supported by an arm which is movable in parallel by a guide member so as to be movable in the circumferential direction along the surface of the recording medium, and the moving device is moved by an electromagnetic force. The magneto-optical recording apparatus according to claim 3, wherein the arm is configured to move in parallel. 6. A magneto-optical device comprising a magnetic head and an optical head, wherein the magnetic head and the optical head move with respect to a recording medium to record information on the recording medium or reproduce the recorded information. A recording device, comprising: a first coil that generates a high-frequency magnetic field for applying to the recording medium at the time of recording information in the magnetic head; and information reproduction that is concentrically arranged on the outer periphery of the first coil. A second direct current magnetic field for applying to the recording medium,
Is provided, and a current is applied to both the first coil and the second coil so as to generate a DC magnetic field in the same direction when reproducing information. Magnetic recording device. 7. A magneto-optical device comprising a magnetic head and an optical head, wherein the magnetic head and the optical head move with respect to a recording medium to record information on the recording medium or reproduce the recorded information. A recording device, comprising: a first coil that generates a high-frequency magnetic field for applying to the recording medium at the time of recording information in the magnetic head; and information reproduction that is concentrically arranged on the outer periphery of the first coil. A second direct current magnetic field for applying to the recording medium,
And a coil for supplying a current to the second coil so as to reduce an induced current flowing in the second coil by a high frequency magnetic field generated by the first coil during recording of information. A magneto-optical recording device characterized by the above.