JP2002056502A - Recording/reproducing head and magnetic recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording/reproducing head suitable for recording/ reproducing a magnetic recording medium for heat assist magnetic recording, and to provide a magnetic recording device. SOLUTION: Suspensions 103a and 103b are provided by being connected to an optical head 110, a magnetic head 120 is formed on the tips of the suspensions 103a and 103b, and the magnetic head 120 is supported by the suspensions 103a and 103b on the light emitting side of the optical head 110. Thus, the magnetic head 120 is stably disposed between the optical head 110 and a magnetic recording medium 10, and brought close to the surface of the magnetic recording head 10. The light emitted from the optical head is transmitted through the center of a hollow-core coil of the magnetic head, and radiated to the medium. The recording/reproducing head is capable of highly accurately forming a minute magnetic domain on the magnetic recording medium, and thus the magnetic recording device having a very high density exceeding 40 G bits/inch2 (approximately 6.20 G bits/cm2) is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing head for recording, erasing, and reproducing information on a magnetic recording medium and a magnetic recording apparatus equipped with the same, and more particularly, to applying heat to the magnetic recording medium during information recording. The present invention relates to a recording / reproducing head capable of applying a magnetic field while applying a magnetic field, and a magnetic recording apparatus equipped with the same.

[0002]

2. Description of the Related Art In recent years, there has been a remarkable progress in the advanced information society, and multimedia in which various forms of information are integrated has rapidly spread. A magnetic disk device mounted on a computer or the like is known as one of multimedia. At present, magnetic disk devices are being developed in a direction to reduce the size while improving the recording density.
At the same time, the cost of the apparatus has been rapidly reduced.

In order to realize a high density magnetic disk, 1) the distance between the magnetic disk and the magnetic head must be reduced, 2) the coercive force of the magnetic recording medium must be increased, and 3).
There is a demand for speeding up a signal processing method, 4) reducing thermal fluctuations of a magnetic recording medium, and the like.

[0004]

Conventionally, it has been extremely difficult to record information on a magnetic recording medium having an increased coercive force for higher density. This is because there is a limit to the magnetic field intensity that can be generated by the current magnetic head, and information cannot be recorded on a magnetic recording medium having a coercive force greater than the magnetic field intensity. Therefore, by irradiating a magnetic recording medium with an increased coercive force with light using an optical head, the area to be recorded is heated to reduce the coercive force in that area, and a magnetic head is used in the area where the coercive force is reduced. A method of recording information by applying a magnetic field corresponding to the information has been proposed. Hereinafter, such a recording method is referred to as heat-assisted magnetic recording. For the reproduction of information recorded by heat-assisted magnetic recording, similar to the reproduction of a conventional magnetic disk,
A leakage magnetic field from a magnetic recording medium is detected by using a reproducing element mounted on a magnetic head. When performing heat-assisted recording, it is necessary to match the magnetic head with the optical head so that a magnetic field is reliably applied to a region irradiated with light.

The 113th meeting of the Japan Society of Applied Magnetics (pp11-40, 2000) states that a recording medium with a high coercive force combines the advantages of the recording method of a magneto-optical recording medium and the recording method of a magnetic recording medium. A technique for forming minute magnetic domains has been disclosed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a recording / reproducing head suitable for thermally assisted magnetic recording and a magnetic recording apparatus including the same.

Another object of the present invention is to provide a recording / reproducing head capable of stably forming minute magnetic domains on a magnetic recording medium for thermally assisted magnetic recording, and a magnetic recording apparatus including the same.

[0008]

According to a first aspect of the present invention, in a recording / reproducing head for a magnetic recording medium, an optical head for irradiating the magnetic recording medium with light, and a magnetic field applied to the magnetic recording medium are applied. And a magnetic head having a reproducing element for detecting a leakage magnetic field intensity from a magnetic recording medium, wherein the magnetic head is provided by at least one suspension connected to the optical head. A recording / reproducing head is provided, which is supported on the light emission side.

The recording / reproducing head of the present invention includes an optical head, a magnetic head, and a suspension. As shown in FIG. 1, one ends of suspensions 103a and 103b are attached to an optical head 110, respectively. It has a structure in which a magnetic head 120 is formed at a tip portion, and the magnetic head is supported by a suspension on the light emission side of the optical head. It is preferable that the magnetic head supported by the suspension is arranged so that the magnetic field generating portion and the optical axis of the optical head coincide with each other. Thereby, at the time of information recording, a desired area of the magnetic recording medium is heated by light irradiated from the optical head, and at the same time, a magnetic field having a polarity corresponding to the recording information is applied from the magnetic head to the heated area, thereby applying a magnetic field to the magnetic recording medium. Information can be reliably recorded. Therefore, it is extremely suitable as a recording / reproducing head for thermally assisted magnetic recording.

In the recording / reproducing head of the present invention, the suspension for supporting the magnetic head can be constituted by using, for example, an elastic leaf spring or wire. When the magnetic head is supported using a plurality of suspensions, the magnetic head may be held at the tip of each suspension, and the other end of each suspension may be connected to the main body of the optical head. By supporting the magnetic head using a plurality of suspensions, the magnetic head can be stably levitated above the magnetic recording medium during recording and reproduction. Further, it is possible to suppress the displacement between the optical axis of the light emitted from the optical head and the center of the magnetic field generated from the magnetic head.

The magnetic head of the recording / reproducing head according to the present invention comprises:
An air-core coil can be provided, and the air-core coil can apply a magnetic field having a polarity corresponding to recorded information to the magnetic recording medium. In this case, a light transmitting portion can be formed at the center of the air-core coil, and the light emitted from the optical head can be transmitted through the light transmitting portion and applied to the magnetic recording medium.

The magnetic head has an element for detecting the intensity of a magnetic field leaking from a magnetic recording medium by a magnetoresistance effect.
MR element (Magneto Resistive element), GMR element (Giant Magneto Resistive element), TMR element (Tunneling Magnet)
o Resistive element; magnetic tunnel type magnetoresistive element)
Can be mounted. By using these reproducing elements, information recorded on the magnetic recording medium can be reproduced with a high S / N.

In the present invention, the magnetic head can be mounted on the slider, so that the magnetic head can be levitated on the magnetic recording medium while maintaining a constant interval. Since the slider stably flies above the magnetic recording medium at a position where the buoyancy caused by the air flow generated by the rotation of the magnetic recording medium and the elastic force of the suspension supporting the magnetic head with respect to the optical head are stable. By appropriately adjusting the buoyancy of the suspension and the elasticity of the suspension, the magnetic head can be floated while approaching the magnetic recording medium. Thereby, even if the magnetic field intensity applied to recording or erasing is weaker than before, the magnetization of the magnetic domain formed in the recording layer of the magnetic recording medium can be reliably reversed. Therefore, the recording frequency of the magnetic head can be increased, and the polarity of the magnetic field generated from the magnetic head can be sufficiently followed in accordance with the recording frequency, achieving higher density recording than before. it can.

Preferably, the slider has a light transmitting portion for transmitting light emitted from the optical head. The light transmitting portion can be composed of, for example, a circular through hole (pinhole) having a diameter of about 100 nm to 300 nm. The diameter of the through hole may be smaller than the diameter of light emitted from the optical head. As a result, part of the light emitted from the optical head passes through the through-hole, and light having a smaller diameter than the light emitted from the optical head is emitted from the through-hole and irradiated on the magnetic recording medium. That is, the through hole formed in the slider serves as a minute light source. As a result, a minute region of the magnetic recording medium is heated, and minute magnetic domains can be formed in the recording layer of the magnetic recording medium. Here, the light transmitted through the through-hole formed in the slider may be light condensed by an objective lens or light obtained by guiding light emitted from a light source using, for example, an optical fiber. . Further, the light may be light reflected and guided by the light reflecting member described above. If an optical fiber or light reflecting member is used,
Since it is not necessary to use an objective lens, the weight of the optical head can be reduced.

In the present invention, the optical head may include an objective lens for condensing light. This allows
The light condensed by the objective lens can be irradiated onto the magnetic recording medium, and a minute area of the recording layer of the magnetic recording medium can be locally heated. In the present invention, the medium emitted from the optical head has a predetermined temperature, for example, 100 ° C.
Since it is sufficient to heat the film to about 120 ° C., it is not always necessary to precisely adjust the focal position of the objective lens on the recording layer of the magnetic recording medium. Therefore, there is no need to provide a mechanism for precisely adjusting the focal position of the objective lens, so that the number of components constituting the optical head can be reduced,
The optical head can be reduced in weight.

In the present invention, the optical head may include a light reflecting member for guiding the laser light emitted from the light source to the side where the magnetic head is located. Such a light reflecting member can be configured using, for example, a prism 61 and a mirror 71 as shown in FIGS. The laser light reflected by the light reflecting member passes through the magnetic head 120 and is then irradiated onto a medium, so that a desired region of the medium can be heated at a desired temperature.

The optical head serves as a light source for irradiating the magnetic recording medium with light, for example, having an oscillation wavelength of 400 nm.
A semiconductor laser light source of up to 850 nm may be mounted. The light generated from the optical head may be continuous light or pulsed light. In particular, when recording is performed by irradiating the medium with pulsed light, the size of the recording mark formed on the recording layer in the track width direction can be extremely reduced.

According to a second aspect of the present invention, a recording / reproducing head according to the first aspect of the present invention, a magnetic recording medium, and a driving device for driving the recording / reproducing head with respect to the magnetic recording medium And a magnetic recording device comprising:

Since the magnetic recording apparatus of the present invention includes the recording / reproducing head of the present invention, minute magnetic domains can be stably recorded with high accuracy on a magnetic recording medium for thermal assist.
Therefore, 40 Gbits / inch ² (about 6.20 Gb
It is possible to provide a magnetic recording device having a recording density exceeding it / cm ² ).

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The recording / reproducing head and the recording / reproducing apparatus of the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

[0021]

Embodiment 1 [Recording / Reproducing Head] FIG. 1 shows a schematic configuration of a specific example of a recording / reproducing head according to the present invention. FIG. 1 (A)
1 is a schematic sectional view of a recording / reproducing head, and FIG. 1 (B) is a magnetic head 11 mounted on the recording / reproducing head 100.
FIG. 2 is a schematic view of the apparatus viewed from below. Recording / playback head 10
0 mainly includes an optical head 110, a magnetic head 120, and suspensions 103a and 103b. Optical head 11
Reference numeral 0 mainly includes an objective lens 101, an optical element 108, and a main body 107 holding them. The numerical aperture of the objective lens 101 is 0.6. Magnetic head 120
Is mainly composed of an air core coil 102 for applying a magnetic field to the magnetic disk 10 and a dual spin valve type GMR element 105 using a giant magnetoresistance effect. The outer diameter of the air core coil 102 is about 50 μm, the inner diameter (diameter of the air core) is about 7 μm, and the number of turns is 20 turns.
The GMR element 105 is, as shown in FIG.
It is formed by bonding to the right side. Suspension 1
Reference numerals 03a and 103b denote elastic thin plate springs which are connected to the outer peripheral portion of the bottom surface of the optical head main body 107, respectively, and which have respective suspensions 103a and 103b.
The tip of 3b is arranged to extend below the objective lens. Suspensions 103a and 103
A magnetic head 120 is attached to the tip of b.
The magnetic head 120 is positioned such that the center of the air-core coil 102 of the magnetic head 120 and the optical axis of the objective lens 101 substantially coincide with each other.
Position has been adjusted. Laser light emitted from a semiconductor laser light source (oscillation wavelength: about 630 nm) not shown is condensed by the objective lens 101 of the optical head 110, passes through the center (core) of the air-core coil 102, and is on the magnetic disk 10. Is irradiated.

During recording and reproduction, the magnetic head 120 flies above the surface of the magnetic disk 10 at a height of 10 nm. The magnetic head 120 has suspensions 103a and 103b.
Therefore, the distance between the air-core coil 102 mounted on the magnetic head 120 and the surface of the magnetic disk 10 can be shortened, and can be maintained at a constant distance. As a result, recording and erasing can be performed even when the current flowing through the air-core coil 102 is reduced. Also, since the center of the air-core coil 102 and the optical axis of the objective lens 101 of the optical head are mounted so as to coincide with each other, the diameter of the air-core of the air-core coil (the diameter of the hole at the center of the coil) can be reduced. . Therefore, a strong magnetic field can be generated from the air core coil 102, and the generated strong magnetic field can be applied to the magnetic disk. In particular, the air-core coil 102
Since it is possible to reduce the recording current flowing through the coil, it is possible to reduce power consumption, reduce the size of the coil, suppress the heat generation of the coil, and the like.
Further, since high-frequency recording becomes possible, the transfer speed can be improved.

[Magnetic Recording Apparatus] The recording / reproducing head 10
0 is mounted on the magnetic recording device 200 for thermally assisted magnetic recording shown in FIGS. FIG. 2 shows a magnetic recording device 200.
FIG. 3 is a cross-sectional view of the magnetic recording device 200 taken along a broken line AA ′ in FIG. 2 and 3, the recording / reproducing head 100 is controlled by a drive system 54. The magnetic disk 10 is a spindle 5 of a rotary drive system.
2 rotates coaxially.

Next, FIG. 4 shows a schematic circuit configuration of the magnetic recording apparatus 200. The magnetic recording device 200 includes a recording / reproducing head driver 41, a semiconductor laser (light source) 42, a laser driver 43, a reproducing circuit 44, a controller 45,
It mainly includes the rotation drive system 54 and the magnetic disk 10. The rotation drive system 54 mainly includes a rotary actuator 46 and a swing arm 47. At the time of recording or reproducing information, the swing arm 47 rotates about the central axis of the rotary actuator 46, and the recording / reproducing head 100
At a desired position on the magnetic disk 10. The positioning of the recording / reproducing head 100 on the magnetic disk 10 can be performed by detecting a magnetic servo signal recorded on the magnetic disk 10 with the magnetic head 120. The recording / reproducing head driver 41 supplies a coil driving current to the air-core coil of the magnetic head mounted on the recording / reproducing head 100 and applies a magnetic field corresponding to the recording information from the air-core coil to the magnetic recording medium during information recording. Can be. Further, the recording / reproducing head driver 41 performs
The leakage magnetic field from the magnetic layer of the magnetic disk detected by the GMR element of the recording / reproducing head 100 is converted into an electric signal, and the converted electric signal can be output to the reproducing circuit. The electric signal is converted into reproduction data by the reproduction circuit 44, and the information recorded on the magnetic disk 10 is reproduced. The laser driver 43 can cause a laser drive current to flow through the semiconductor laser 42 to cause the semiconductor laser 42 to irradiate the magnetic disk 10 with laser light. Also,
The laser driver 43 can control the semiconductor laser 42 and generate laser light from the semiconductor laser 42 continuously or in a pulsed manner. Controller 45
Are a laser driver 43 and a recording / reproducing head driver so that a magnetic field generated from a magnetic head of the recording / reproducing head 100 and a laser beam generated from the semiconductor laser 42 are applied on a magnetic disk at the same timing in accordance with recording information. 41 can be controlled.

[Magnetic Disk] Next, the magnetic disk 10 mounted on the magnetic recording apparatus 200 will be described. FIG. 9 shows a schematic sectional structure of the magnetic disk 10.
The magnetic disk 10 has the same laminated structure as a medium used for magneto-optical recording, and has a light reflecting film 2, a first inorganic compound film 3, a magnetic film 4, a second inorganic compound film 5, and a lubricant on a substrate 1. It has a structure in which the layers 6 are sequentially laminated. The magnetic disk 10 having such a structure was manufactured as described below.

First, a glass substrate having a diameter of 3.5 inches (about 8.89 cm) was prepared as the substrate 1. Then
An Al—Ti film as a light reflection film 2 is formed on the substrate 1 by 3.
It was formed to a thickness of 0 nm. Pure Ar as discharge gas, Al
The ₉₀ Ti ₁₀ alloy was used, respectively to the target. The pressure during sputtering is 15 mTorr (about 1.995 P
a), the input RF power is 0.5 kW / 150 mmφ. Here, no difference was found between the composition of the formed thin film and the composition of the target.

Next, a silicon nitride film was formed as a first inorganic compound film 3 on the light reflecting film 2 by a sputtering method. Ar / N ₂ was used as a discharge gas with Si as a target. The pressure during sputtering is 10 mTorr (about 1.33 Pa), and the input RF power is 0.7 kW / 150 m
mφ. The thickness of the first inorganic compound film 3 is 15 nm.

Next, a Tb—Fe—Co film as a magnetic film 4 is formed on the first inorganic compound film 3 by a sputtering method.
The film was formed with a thickness of nm. The target for sputtering is Tb ₂₆ Fe produced by the hot static pressure press (HIP) method.
_{A 62} Co ₁₂ alloy was used. When the target is manufactured by the HIP method, the effect of reducing the oxygen content in the target and greatly reducing the composition difference between the target and the film to be formed can be obtained. The sputtering pressure was 5 mTorr (about 665 mPa), and the input RF power was 1.
5 kW / 150 mmφ. When the magnetic properties of the magnetic film were measured, the coercive force was 10.0 kOe (about 79 kOe).
5.8 kA / m), perpendicular magnetic anisotropy energy is 2 × 10 ⁷ erg / ml, and saturation magnetization is 120 emu / m.
l. The Curie temperature was 210 ° C and the compensation temperature was 80 ° C.

Next, a second inorganic compound film 5 is formed on the magnetic film 4.
A silicon nitride film was formed to a thickness of 65 nm by a sputtering method. Si was used as a target, and Ar / N ₂ was used as a discharge gas. The pressure during sputtering is 10 mTorr
(About 1.33 Pa), the input RF power is 0.7 kW / 15
0 mmφ. The thickness of the second inorganic compound film 5 is 20 n
m.

Next, after the surface of the second inorganic compound film 5 is tape-cleaned, a lubricant is applied to the surface to a thickness of about 1 n.
m. Thus, a magnetic disk having the laminated structure shown in FIG. 9 was manufactured. If the distance between the magnetic head and the surface of the magnetic disk is 100 nm or more during recording / reproduction, the manufacturing process may be simplified except for processing such as tape cleaning.

[Recording / Reproduction Characteristics] Next, the magnetic disk 1
0 to 40 Gbits / inch ² (about 6.20 Gbit
s / cm ² ) was recorded (700 kFCI). For recording information, the optical head 110 shown in FIG.
The laser beam is continuously applied to the magnetic disk 10 and the air-core coil 10 mounted on the magnetic head 120 at the same time.
A modulated magnetic field having a constant modulation from 2 was applied. Here, for recording information, an optical pulse magnetic field modulation method that modulates both an optical pulse and a magnetic field may be used, or a light intensity modulation recording method that modulates only light may be used. In any case, magnetic field application and light irradiation are performed simultaneously during information recording. The recording / reproducing head 100 of the present embodiment has the air-core coil 1
Since the distance between the magnetic disk 02 and the magnetic disk 10 can be reduced, recording can be performed with a weak magnetic field. Also, since the inductance of the air core coil 102 can be reduced, high-frequency recording can be performed.

When the same recording mark was reproduced by the GMR element 105 of the magnetic head 120 shown in FIG. 1, the S / N was 3 for the GMR element having a gap length of 0.12 μm.
A reproduction signal output of 4 dB was obtained. Here, the magnetic head 12
0 and the magnetic layer of the magnetic disk 10 are 12 n
m. The flying distance can be adjusted by adjusting the elastic modulus of the suspensions 103a and 103b, or by adjusting the magnetic head 120.
It can be adjusted to a desired value by changing the shape of the bottom surface or by suitably selecting the rotation speed of the magnetic disk 10. When we measured the defect rate of the magnetic disk,
The value when signal processing was not performed was 1 × 10 ⁻⁵ or less.

In recording information, the optical head 110 may continuously emit multi-pulses at intervals of 20 ns, and simultaneously apply a constant modulated magnetic field to the magnetic disk 10 from the air-core coil 102 of the magnetic head 120. . The pulse interval from the optical head 110 is 15 ns and 15 m
W microscopic light pulses are emitted, and the air-core coil 10
The information may be recorded on the magnetic disk 10 by applying a pulsed magnetic field from 2 in synchronization with the light pulse. As a result, magnetic domains significantly smaller than the diameter of the air core of the air-core coil could be formed on the magnetic film of the magnetic disk.

From the above results, by using the recording / reproducing head having the magnetic head supported by the suspension on the light emitting side of the optical head, 40 Gbits / inc.
A recording density exceeding h ² (about 6.20 Gbits / cm ² ) could be achieved. When the recording / reproducing head of the present invention is used, a magnetic field can be applied to a narrow range, so that the reproducing resolution can be improved.

[0035]

Embodiment 2 FIG. 5 shows a schematic configuration of another specific example of the recording / reproducing head. FIG. 5A is a schematic sectional view of a recording / reproducing head, and FIG. 5B is a schematic diagram of a magnetic head mounted on the recording / reproducing head as viewed from the bottom. The recording / reproducing head 500 includes a slider 55, and the slider 55 includes the air-core coil 102 and the GMR element 105.
Is installed. The slider 55 is connected to the optical head 110 by a suspension 103 connected to the optical head 110.
Are supported on the light exit side. A through hole 56 is formed in the slider 55 as a light transmitting portion, and the air core coil 10 is positioned so that the center of the through hole 56 and the air core coil 102 match.
2 are arranged. The diameter of the through hole 56 is
5, which is larger than the diameter of the light emitted from the optical head 110 located above and is about 1.5 μm. Optical head 110
The light condensed by the objective lens 101 passes through the through-hole 56 and is irradiated onto the magnetic disk 10. Further, the slider 55 can fly above the magnetic disk 10 at a desired height during recording and reproduction. Thereby, the air-core coil 10
2 can be brought closer to the magnetic disk 10.

The recording / reproducing head and the magnetic recording apparatus of the present invention have been described in detail with reference to the embodiments. However, the present invention is not limited to these, and includes various improvements and modifications. For example, the recording / reproducing head according to the first embodiment has a configuration in which the magnetic head is supported below the optical head by using two suspensions, but the magnetic head is supported by using three or four or more suspensions. good. As the number of locations for fixing the magnetic head increases, the alignment between the optical axis of the objective lens and the center of the air-core coil can be further stabilized.

Further, in the first embodiment, a substrate having a diameter of 3.5 inches (about 8.89 cm) is used as a substrate for a magnetic disk, but a disk substrate of any size may be used.
Also, the material of the substrate is not limited to glass,
For example, the effects of the present invention are not affected even if a resin such as polycarbonate or amorphous polyolefin is used. Also, for positioning of the recording / reproducing head,
A substrate having an uneven guide groove can also be used. In this case, an uneven guide groove may be formed after the formation of the magnetic disk.

In the above embodiment, the GMR element is used as the reproducing element mounted on the recording / reproducing head.
R (Magneto Resistive) element and TMR (Tunneling Mag
A netoResistive element can also be used.

In the first embodiment, a magnetic disk having the same laminated structure as a medium used in magneto-optical recording was manufactured as a magnetic disk mounted on a magnetic recording apparatus. However, the present invention is not limited to this. A magnetic disk, for example, a magnetic disk using a Co-based magnetic material for a magnetic layer or a magnetic disk for thermally assisted magnetic recording can also be used.

In the second embodiment, the diameter of the through hole formed in the slider is larger than the diameter of the light emitted from the optical head. However, the diameter of the through hole may be smaller than the diameter of the light. In this case, a part of the light emitted from the optical head passes through the through hole and is irradiated on the magnetic disk. As a result, a desired minute area of the magnetic disk is heated, so that minute recording marks can be formed on the magnetic film.

As a modification of the recording / reproducing head, as shown in FIG.
Suspension 103 to the suspension 10
3 is positioned so that the tip of the magnetic head 12 is located below the optical head 110.
A recording / reproducing head having a structure in which the magnetic head 120 is supported on the light emitting side of the optical head by fixing 0 may be used.

The recording / reproducing head of the present invention has a structure in which a magnetic head having an air-core coil for applying a magnetic field and a reproducing element is mounted on a suspension connected to the optical head, and is supported on the light emitting side of the optical head. have. When such a recording / reproducing head is arranged on a magnetic disk, the magnetic head mounted on the recording / reproducing head stably flies at a desired flying height by rotation of the magnetic disk. Thus, a magnetic field having a constant strength can be stably applied to the magnetic disk. In addition, since the size and the power consumption of the air-core coil of the magnetic head can be reduced and the inductance can be reduced, high-frequency recording can be performed and the transfer speed can be increased. Further, since the hole diameter at the center of the air-core coil can be reduced, a strong magnetic field can be generated from the air-core coil. Therefore, even if the distance between the air-core coil and the magnetic recording medium is increased, a magnetic field intensity sufficient for recording and erasing information can be applied. Therefore, it is possible to suppress a head crash and the like, and to provide a magnetic recording device having high reliability.

The magnetic recording apparatus having the recording / reproducing head according to the present invention can form minute magnetic domains on a magnetic recording medium with high precision, so that 40 Gbits / inch ² (about 6.20 Gb)
It is possible to realize ultra-high density recording exceeding it / cm ² ).

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a recording / reproducing head according to the present invention;
FIG. 1A is a schematic sectional view of a recording / reproducing head, and FIG.
(B) is a schematic view of the magnetic head mounted on the recording / reproducing head as viewed from the bottom.

FIG. 2 is a schematic configuration diagram of a magnetic recording device according to the present invention.

FIG. 3 is a cross-sectional view of the magnetic recording device of FIG. 2 in the AA 'direction.

FIG. 4 is a schematic circuit diagram of the magnetic recording device of FIG. 2;

FIG. 5 is a specific example of the recording / reproducing head according to the present invention, which is different from FIG. 1. FIG. 5 (A) is a schematic sectional view of the recording / reproducing head, and FIG. 5 (B) is mounted on the recording / reproducing head. FIG. 2 is a schematic view of the magnetic head viewed from the bottom.

FIG. 6 is a specific example of a recording / reproducing head according to the present invention, in which an optical head includes a prism as a light reflecting member.

FIG. 7 is a specific example of a recording / reproducing head according to the present invention, in which an optical head is provided with a mirror as a light reflecting member.

FIG. 8 is a specific example of a recording / reproducing head in which a suspension for supporting a magnetic head on the light emission side of an optical head is connected to an arm supporting the optical head.

9 is a schematic sectional view of a magnetic disk mounted on the magnetic recording device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Light reflection film 3 First inorganic compound film 4 Magnetic film 5 Second inorganic compound film 6 Lubricant layer 10 Magnetic disk body 52 Spindle 54 Rotation drive system 100, 500 Recording / reproducing head 200 Magnetic recording device 101 Objective lens 102 Empty Core coil 103, 103a, 103b Suspension 104 Laser beam 105 Reproducing element 110 Optical head 120 Magnetic head

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 11/105 566 G11B 11/105 566A 571 571D 571G 1-88 Hitachi Maxell Co., Ltd. (72) Inventor Hiroyuki Awano 1-88 Ushitora, Ibaraki-shi, Osaka F-term within Hitachi Maxell Co., Ltd. 5D034 AA01 BA02 BB01 CA00 5D075 AA03 CC11 CD18 CD20 CF03 5D091 AA08 CC17 CC24 DD03

Claims (10)

[Claims] 1. A recording / reproducing head for a magnetic recording medium, comprising: an optical head for irradiating the magnetic recording medium with light; a recording element for applying a magnetic field to the magnetic recording medium; and a leakage magnetic field intensity from the magnetic recording medium. A magnetic head having a reproducing element for detection, wherein the magnetic head is supported on a light emission side of the optical head by at least one suspension connected to the optical head. head. 2. The recording / reproducing head according to claim 1, wherein a magnetic head is arranged so that a magnetic field generating part of the recording element and a light emitting part of the optical head are substantially coaxial. 3. The read / write head according to claim 1, wherein the recording element is an air-core coil, and a magnetic field is applied to the magnetic recording medium by the air-core coil. 4. The read / write head according to claim 3, wherein light from the optical head passes through a central portion of the air-core coil. 5. The magnetic head according to claim 1, wherein the magnetic head is mounted on a slider that floats on a magnetic recording medium, and the slider is provided with a light transmitting portion for transmitting light from the optical head. The recording / reproducing head according to any one of claims 1 to 4, wherein 6. The read / write head according to claim 5, wherein the light transmitting portion is a through hole having a diameter smaller than a diameter of light emitted from the optical head. 7. The reproducing element according to claim 1, wherein the reproducing element is one kind of reproducing element selected from the group consisting of a magnetoresistive element, a giant magnetoresistive element, and a magnetic tunnel type magnetoresistive element. 7. The recording / reproducing head according to any one of items 6 to 6. 8. The recording / reproducing head according to claim 1, wherein the optical head includes an objective lens for condensing light. 9. The recording / reproducing head according to claim 1, wherein the optical head includes a light reflecting member, and the light is guided by the light reflecting member toward the magnetic head. 10. A magnetic device comprising: the recording / reproducing head according to claim 1; a magnetic recording medium; and a driving device for driving the recording / reproducing head with respect to the magnetic recording medium. Recording device.