Magnetic recording and reproducing apparatus

Abstract

Provided is a magnetic recording and reproducing apparatus capable of reducing transfer of contaminants to a magnetic head. The magnetic recording and reproducing apparatus according to the present invention includes: a magnetic recording medium in a disc shape; a motor that rotates the magnetic recording medium; a magnetic head that includes a magnetic head element that reads information from the magnetic recording medium and a magnetic head element that writes information to the magnetic recording medium; and a bias circuit that supplies a predetermined bias voltage to the magnetic head element that reads information from the magnetic recording medium, wherein the magnetic recording medium has, in order, a magnetic layer and a carbon protective layer on a substrate, and the bias circuit supplies a voltage of -0.2 V to -1.0 V relative to the potential of the magnetic recording medium to the magnetic head element.

Description

TECHNICAL FIELD

[0001] The present application relates to a magnetic recording and reproducing apparatus. BACKGROUND

[0002] A magnetic recording and reproducing apparatus is widely used in order to record various data on a recording medium such as a hard disk, various recording media, and the like, and to save them. The magnetic recording and reproducing apparatus is provided with a magnetic head for reading and writing information on a magnetic recording medium. The magnetic head is composed of two, a write head and a read head, and performs reading and writing of information while floating on the surface of the magnetic recording medium.

[0003] The write head is a magnetic stone that combines a coil and a magnetic body, and uses a thin film head that is generated on the surface of the magnetic body by etching the coil along with miniaturization of an access area.

[0004] The read head uses an MR head (Magneto Resistive head) that has high sensitivity by using a magnetic resistance effect, a GMR head (Giant Magneto Resistive head) that uses a giant magnetic resistance effect, a TMR head (Tunnel Magneto Resistive head) that uses a tunnel magnetic resistance effect, and the like. Among them, the TMR head has a basic structure in which a TMR element is sandwiched by two electrodes, and reads magnetic information by a current change between the two electrodes.

[0005] A voltage of generally about 0.2 V is applied between the two electrodes, and the two electrodes are exposed to a facing surface with the magnetic recording medium. Therefore, in order to prevent discharge with the magnetic recording medium, for example, a magnetic disk storage device is disclosed in which one end of the electrode is connected to the magnetic recording medium, thereby substantially becoming the same potential (for example, refer to Patent Document 1).

[0006] PRIOR ART DOCUMENT

[0007] PATENT DOCUMENT

[0008] Patent Document 1: Japanese Re-publication of Patent WO 00 / 057404 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] The floating amount of the magnetic head further decreases along with an increase in recording density of the magnetic recording medium. In the case where the floating amount of the magnetic head is small, even if there is a small amount of contaminants on the magnetic recording medium, or there are chemical substances brought from the environment, the magnetic recording medium comes into contact with or close to the magnetic head by floating, and thus the contaminants are attached or transferred to the magnetic head side. Such contaminants of the magnetic head not only degrade the recording and reproducing characteristics of the magnetic head, but also become a cause of damage to the floating stability of the magnetic head, and further, a cause of destruction of the magnetic head.

[0011] One embodiment of the present application has been made in view of the above-described circumstances, and has an object to provide a magnetic recording and reproducing apparatus capable of reducing transfer of contaminants to a magnetic head.

[0012] Method for solving the problem

[0013] One embodiment of the magnetic recording and reproducing apparatus according to the present application includes: a magnetic recording medium in a disc shape; a motor that rotationally drives the magnetic recording medium; a magnetic head that has a magnetic head element that reads information from the magnetic recording medium and a magnetic head element that writes the information; and a bias circuit that supplies a prescribed bias voltage to the magnetic head element that reads the information, the magnetic recording medium sequentially has a magnetic layer and a carbon protective layer on a substrate, and the bias circuit supplies a voltage of -0.2 V to -1.0 V with respect to a potential of the magnetic recording medium to the magnetic head element.

[0014] Effects of the Invention

[0015] One embodiment of the magnetic recording and reproducing apparatus according to the present application can reduce transfer of contaminants to a magnetic head. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A diagram for showing a configuration of a magnetic recording and reproducing apparatus according to an embodiment of the present application.

[0017] Figure 2 A diagram for schematically showing a magnetic recording medium and a magnetic head.

[0018] Figure 3 A diagram for showing a relationship between a potential difference between a magnetic head and a magnetic recording medium and a touch down power. DETAILED DESCRIPTION

[0019] Hereinafter, an embodiment of the present application will be described in detail. Also, in order to make the understanding of the description easy, the same reference numerals are attached to the same constituent elements in each drawing, and overlapping description is omitted. Further, the scale of each member in the drawing is sometimes different from that in actuality. In the present specification, "to" indicating a numerical range indicates that the numerals written before and after the "to" are included as lower limit values and upper limit values, unless otherwise specified.

[0020] Magnetic recording and reproducing apparatus

[0021] The magnetic recording and reproducing apparatus according to the embodiment of the present application has a magnetic recording medium in a disc shape, a motor that rotates the magnetic recording medium, a head element that reads information from or writes information to the magnetic recording medium, and a bias circuit that supplies a prescribed bias voltage to the head element that reads information from the magnetic recording medium. The magnetic recording medium has a magnetic layer and a carbon protective layer in this order on a substrate. The bias circuit supplies a voltage in the range of -0.2 V to -1.0 V with respect to the potential of the magnetic recording medium to the head element. The magnetic recording and reproducing apparatus according to the embodiment of the present application has the above-described configuration, and thus can reduce contamination and damage of the head element caused by contamination of the magnetic recording medium.

[0022] It is considered that the contamination present on the surface of the magnetic recording medium is often taken in from the outside (for example, the surrounding environment or the handling of the magnetic recording medium) in the manufacturing process of the magnetic recording medium. Therefore, attempts have been made to reduce the contamination present on the surface of the magnetic recording medium by making the manufacturing environment of the magnetic recording medium purer.

[0023] On the other hand, as the recording density required of the magnetic recording and reproducing apparatus is increasingly higher, the amount of head float on the surface of the magnetic recording medium is increasingly smaller, and thus the extremely small contamination that cannot be removed in the conventional method has begun to be a problem.

[0024] The present inventors analyzed the cause of the extremely small contamination attached to the head element, and as a result, found that the contamination that accounts for a large proportion is a product generated from carbon and carbon nitride generated from the carbon protective layer of the magnetic recording medium, which is attached to the head element due to the potential present between the magnetic recording medium and the head element. In addition, it was found that these attachments have a negative charge and are easily attached to the head element due to the potential present between the magnetic recording medium and the head element. The present inventors found that by providing a bias circuit that supplies a prescribed bias voltage to the head element that reads information, and by using the bias circuit, supplying a voltage in the range of -0.2 V to -1.0 V with respect to the potential of the magnetic recording medium to the head element, it is possible to reduce the attachment of the attachments generated from the carbon protective layer of the magnetic recording medium to the head element.

[0025] Figure 1 A schematic view showing the configuration of the magnetic recording and reproducing apparatus according to the embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the magnetic recording and reproducing apparatus 1 according to the embodiment of the present application has a magnetic recording medium 2 in a disc shape, a motor 3 that rotates the magnetic recording medium 2, a head 4 that reads information from and writes information to the magnetic recording medium 2, and a lamp mechanism 5 that retracts the head 4 from the magnetic recording medium 2. Figure 1

[0026] In addition, the magnetic recording and reproducing apparatus 1 according to the embodiment of the present application has a bias circuit 6 that supplies a prescribed bias voltage to the head 4 that reads information from the magnetic recording medium 2. The magnetic recording medium 2 has a magnetic layer 21 and a carbon protective layer 22 in this order on a substrate 20. The bias circuit 6 supplies a voltage in the range of -0.2 V to -1.0 V with respect to the potential of the magnetic recording medium 2 to the head 4. Figure 1 ​indicates a state in which information is read from or written to the magnetic recording medium 2 using the magnetic head 4, but the magnetic head 4 is floated in the vertical direction on the main surface of the magnetic recording medium 2 by a vortex of air generated due to the rotation of the magnetic recording medium 2 by the motor 3, and is driven in the parallel direction to the surface of the magnetic recording medium 2 by the voice coil motor 7.

[0027] Figure 2 A diagram showing the magnetic recording medium 2 and the magnetic head 4 schematically. As shown in Figure 2 the magnetic recording medium 2 is provided with a non-magnetic substrate 21, a magnetic layer 22, a carbon protective layer 23, and a lubricant layer 24, which are sequentially stacked on the non-magnetic substrate 21. Further, the magnetic recording medium 2 is grounded.

[0028] The magnetic head 4 is provided at the front end of a gimbal 9 of a head assembly 8. The magnetic head 4 has a magnetic head element 41A for reading information from the magnetic recording medium 2, a magnetic head element 41B for writing, and a pair of electrodes 42A and 42B. The pair of electrodes 42A and 42B are connected to a preamplifier 43, and an output signal from the magnetic head element 41A for reading is delivered to the preamplifier 43. Further, a wiring Ll connecting the electrode 42A and the preamplifier 43 is connected to a bias circuit 44. By the bias circuit 44, a voltage in the range of -0.2 V to -1.0 V is applied to the electrodes 42A and 42B with respect to the ground potential of the magnetic recording medium 2.

[0029] The resistance value of the magnetic head element 41A for reading is usually about 20 Ω, and a bias current flowing therein is about 10 mA, so that a potential difference of about 0.2 V is generated between the electrodes 42A and 42B of the magnetic head element 41A.

[0030] Generally, in a magnetic recording and reproducing apparatus, one end of an electrode of a magnetic head element is connected to a magnetic recording medium in order to prevent discharge from the magnetic recording medium. Therefore, a potential difference of 0 to 0.2 V in absolute value is generated between the magnetic head elements 41A and 41B and the magnetic recording medium 2, and a potential difference of 0 to 0.2 V in absolute value is generated between the two electrodes of the magnetic head element.

[0031] On the other hand, according to the present inventor's research, it was found that even if the potential difference of 0 to 0.2 V generated between the head elements 41A and 41B and the magnetic recording medium 2 is temporarily negative, the possibility that the contaminant substances of carbon and carbon nitride having a negative charge generated by the carbon protective layer 23 adhere to the head 4 at the potential difference cannot be sufficiently suppressed. In order to prevent contamination of the head 4, it is necessary to apply a negative potential of 0.2 V or more in absolute value, and preferably 0.3 V or more in absolute value with respect to the magnetic recording medium 2 in the head elements 41A and 41B. The greater the negative potential between the head elements 41A and 41B and the magnetic recording medium 2, the lower the adhesion of the ionic substances having a negative charge of carbon and carbon nitride generated by the carbon protective layer 23. However, if the negative potential becomes too large, it leads to the adhesion of other ionic substances having a positive charge, and the risk of discharge between the head elements 41A and 41B and the magnetic recording medium 2 also becomes high. Thus, the negative potential between the head elements 41A and 41B and the magnetic recording medium 2 is 1.0 V or less in absolute value, and preferably 0.7 V or less in absolute value.

[0032] Therefore, the head element 41A that performs reading of information has a structure in which both ends thereof are sandwiched by the two electrodes 42A and 42B, and among the entire head elements 41A and 41B and the electrodes 42A and 42B, the potential with respect to the ground potential of the magnetic recording medium 2 becomes a potential in the range of -0.2 V to -1.0 V, and more preferably a potential in the range of -0.3 V to -0.7 V.

[0033] In addition, the magnetic recording medium 2 includes the non-magnetic substrate 21, the magnetic layer 22, the carbon protective layer 23, and the lubricant layer 24, and can include other layers in addition thereto. For example, the magnetic recording medium 2 can appropriately have a close contact layer, a soft magnetic underlayer, a seed layer, an orientation control layer, and the like between the non-magnetic substrate 21 and the magnetic layer 22 as needed. The soft magnetic underlayer can be configured to include a first soft magnetic layer, an intermediate layer, and a second soft magnetic layer, for example. The orientation control layer can be one layer, or two layers (e.g., a first orientation control layer, a second orientation control layer, and the like) or more. The materials that form the close contact layer, the soft magnetic underlayer, the seed layer, the orientation control layer, and the like can use general materials used for magnetic recording media.

[0034] An example of a manufacturing method of the magnetic recording medium 2 will be described. The manufacturing method of the magnetic recording medium 2 includes at least a step of forming the magnetic layer 22 on the non-magnetic substrate 21, a step of forming the carbon protective layer 23 on the magnetic layer 22, and a step of forming the lubricant layer 24 on the carbon protective layer 23.

[0035] As the non-magnetic substrate 21, a substrate having a film formed of NiP or NiP alloy on a base formed of a metal material such as Al, Al alloy, or the like can be used. Further, as the non-magnetic substrate 21, a substrate formed of a non-metal material such as glass, ceramic, silicon, silicon carbide, carbon, resin, or the like can be used, and a substrate having a film of NiP or NiP alloy formed on a base formed of the non-metal material can be used.

[0036] As the magnetic layer 22, a layer formed of Co-Cr-based, Co-Cr-Ta-based, Co-Cr-Pt-based, Co-Cr-Pt-Ta-based, Co-Cr-Pt-B-Ta-based alloy, or the like is used. The magnetic layer 22 can be formed by any of the conventionally known methods.

[0037] The thickness of the magnetic layer 22 is preferably 5 nm to 100 nm, more preferably 6 nm to 50 nm, and further preferably 7 nm to 22 nm. If the thickness of the magnetic layer 22 is within the above-mentioned preferable range, high recording density is achieved.

[0038] In the present specification, the thickness of the magnetic layer 22 refers to the length in the direction perpendicular to the main surface of the magnetic layer 22. The thickness of the magnetic layer 22 is, for example, the thickness at an arbitrary site on the cross section of the magnetic layer 22. In the case where the thickness is measured at a plurality of sites on the cross section of the magnetic layer 22, the average of the thicknesses at the sites can be used. Hereinafter, the same measurement method as the thickness of the magnetic layer 22 can be used for other layers.

[0039] The magnetic layer 22 can be formed on the non-magnetic substrate 21 by a sputtering method or the like.

[0040] The magnetic layer 22 can be contained in a plurality of layers. In this case, the magnetic layers 22 can each include a non-magnetic layer therebetween. The non-magnetic layer can be formed using a general material used for a magnetic recording medium. The magnetic layers 22 can each be formed using the same kind of material, or different kinds of materials can be used.

[0041] The carbon protective layer 23 has a function of protecting the magnetic layer 22 and improving the slidability of the magnetic head 4. The carbon protective layer 23 can use a conventionally known material such as carbon, carbon nitride, carbon hydride, carbon nitride hydride, or the like.

[0042] The thickness of the carbon protective layer 23 is preferably in the range of 1 nm to 10 nm from the viewpoint of reduction of magnetic gap or durability in the case of use in a high recording density state. Here, the magnetic gap indicates the distance between the element portion of the magnetic head 4 and the magnetic layer 22. The narrower the magnetic gap, the higher the electromagnetic conversion characteristics.

[0043] As a film formation method of the carbon protective layer 23, a sputtering method using a carbon target material, a CVD (chemical vapor deposition) method using a hydrocarbon raw material such as ethylene or toluene, an ion beam deposition (IBD) method, or the like is generally used, and these methods can be combined to form a multilayer structure.

[0044] The lubricant layer 24 preferably has a thickness in the range of 1 nm to 3 nm.

[0045] The lubricant layer 24 can be formed using a liquid lubricant layer. As the liquid lubricant layer, a layer that is chemically stable, has low friction, and has low adsorptivity is suitably used, and a fluororesin-based lubricant such as a perfluoropolyether-based lubricant including a compound having a perfluoropolyether structure is preferably used.

[0046] The lubricant layer 24 can be formed on the carbon protective layer 23 by a coating method or the like.

[0047] Thus, the magnetic recording and reproducing apparatus 1 has the magnetic recording medium 2 having the magnetic layer 22 and the carbon protective layer 23 in this order on the non-magnetic substrate 21, the motor 3, the magnetic head 4 having the magnetic head elements 41A and 41B, and the bias circuit 44 that supplies a voltage of -0.2 V to -1.0 V with respect to the potential of the magnetic recording medium 2 to the magnetic head elements 41A and 41B. The magnetic recording and reproducing apparatus 1 can reduce the adhesion of ionic substances having a negative charge of carbon and carbon nitride generated from the carbon protective layer 23 to the magnetic head elements 41A and 41B, and can reduce the adhesion of other ionic substances having a positive charge to the magnetic head elements 41A and 41B. Therefore, the magnetic recording and reproducing apparatus 1 can reduce the transfer of contaminants such as ionic substances to the magnetic head 4. Thus, the magnetic recording and reproducing apparatus 1 can surely perform the readout and write of information, and thus has stable magnetic recording and reproducing characteristics. Further, the magnetic recording and reproducing apparatus 1 can hardly cause the contamination and damage of the magnetic head 4 due to the contamination of the magnetic recording medium 2, and thus can have excellent environmental resistance.

[0048] The magnetic recording and reproducing apparatus 1 can supply a voltage of -0.3 V to -0.7 V to the magnetic head elements 41A and 41B. Thus, the magnetic recording and reproducing apparatus 1 can further reduce the adhesion of ionic substances having a negative charge of carbon and carbon nitride generated from the carbon protective layer 23 and other ionic substances having a positive charge to the magnetic head elements 41A and 41B, and thus can more surely reduce the transfer of contaminants to the magnetic head 4.

[0049] The magnetic recording and reproducing apparatus 1 has the above-described characteristics, and thus the distance between the magnetic head and the magnetic recording medium is narrow, and the magnetic head can be used while reducing the transfer of contaminants to the magnetic head 4 even if the amount of floating of the magnetic head is further reduced. Thus, the magnetic recording and reproducing apparatus 1 can be suitably used for a magnetic recording and reproducing apparatus further having a high recording density.

[0050] Example

[0051] Hereinafter, examples and comparative examples are shown to further specifically explain the embodiments, but the embodiments are not limited to these examples and comparative examples.

[0052] (Magnetic recording medium manufacturing)

[0053] A washed glass substrate (HOYA Co., Ltd., outer shape 2.5 inches) was housed in a film forming chamber of a DC magnetron sputtering device (C-3040, anelva Co., Ltd.), and the film forming chamber was evacuated until reaching a vacuum degree of 1 x 10 -5 Pa.

[0054] Then, on the glass substrate, a 10 nm-thick adhesion layer was formed by sputtering using a Cr target.

[0055] Next, a soft magnetic underlayer was formed on the adhesion layer by sputtering. As the soft magnetic underlayer, a first soft magnetic layer, an intermediate layer, and a second soft magnetic layer were formed. First, a 25 nm-thick first soft magnetic layer was formed at a substrate temperature of 100°C or lower using a target of Co-20Fe-5Zr-5Ta {Fe content: 20 at%, Zr content: 5 at%, Ta content: 5 at%, and the remainder Co}. Next, a 0.7 nm-thick intermediate layer formed of Ru was formed on the first soft magnetic layer. Then, a 25 nm-thick second soft magnetic layer formed of Co-20Fe-5Zr-5Ta was formed on the intermediate layer.

[0056] Next, a 5 nm-thick seed layer was formed on the soft magnetic underlayer by sputtering using a Ni-6W {W content: 6 at%, and the remainder Ni} target.

[0057] Then, on the seed layer, a 10 nm-thick Ru layer was formed as a first orientation control layer by sputtering at a sputtering pressure of 0.8 Pa. Next, on the first orientation control layer, a 10 nm-thick Ru layer was formed as a second orientation control layer by sputtering at a sputtering pressure of 1.5 Pa.

[0058] Next, on the second orientation control layer, a 9 nm-thick first magnetic layer formed of 91(Co15Cr16Pt)-6(SiO2)-3(TiO2) {Cr content: 15 at%, Pt content: 16 at%, and the remainder Co as an alloy at 91 mol%, oxide formed of SiO2 at 6 mol%, and oxide formed of TiO2 at 3 mol%} was formed by sputtering at a sputtering pressure of 2 Pa.

[0059] Next, on the first magnetic layer, a non-magnetic layer formed of 88(Co30Cr)-12(TiO2) {Cr content: 30 at%, the remaining portion of Co: 88 mol%, oxide formed of TiO2: 12 mol%} was formed by sputtering at a thickness of 0.3 nm.

[0060] Then, on the non-magnetic layer, a second magnetic layer formed of 92(Co11Cr18Pt)-5(SiO2)-3(TiO2) {Cr content: 11 at%, Pt content: 18 at%, the remaining portion of Co: 92 mol%, oxide formed of SiO2: 5 mol%, oxide formed of TiO2: 3 mol%} was formed by sputtering at a thickness of 6 nm with a sputtering pressure of 2 Pa.

[0061] Then, on the second magnetic layer, a non-magnetic layer formed of Ru was formed by sputtering at a thickness of 0.3 nm.

[0062] Next, on the non-magnetic layer, a third magnetic layer was formed by sputtering using a target formed of Co-20Cr-14Pt-3B {Cr content: 20 at%, Pt content: 14 at%, B content: 3 at%, the remaining portion of Co} at a thickness of 7 nm with a sputtering pressure of 0.6 Pa.

[0063] Next, a protective layer formed of carbon nitride (N content: 5 at%) at a thickness of 3 nm was formed by ion beam method.

[0064] Next, on the protective layer, a liquid lubricant of perfluoropolyether was applied at a thickness of 1.4 nm by dip coating to form a lubricating layer, and a magnetic recording medium was produced.

[0065] (Seek evaluation of the magnetic recording medium)

[0066] A magnetic recording and reproducing apparatus of the structure of Figure 1 was produced using the produced magnetic recording medium, and seek evaluation was performed. The magnetic recording and reproducing apparatus was filled with helium gas. The filling pressure was set to 532 Torr. The magnetic recording and reproducing apparatus was set in an environment of 60°C, the rotation speed of the magnetic recording medium was set to 7200 rpm, and the magnetic head was floated to move at a position of a radius of 32 mm, and the potential difference between the high potential side in terms of the absolute value of the magnetic head element and the magnetic recording medium was set to +1.0 V, +0.8 V, +0.6 V, +0.4 V, 0, -0.3 V, -0.7 V, and -1.0 V, and the magnetic head was set to float at the point for 900 seconds in each condition, and evaluation of the mass of contaminants adhered to the magnetic head was performed. The evaluation of the mass of contaminants was performed by measuring the Δstiction power of the magnetic head.

[0067] The so-called delta touch-down power is the power applied to the heater when the read-in element is in contact (touch-down) with the magnetic recording medium as a result of the thermal expansion of the heater built in the vicinity of the read-in element of the magnetic head. The more the mass of the contaminants attached to the magnetic head increases, the greater the absolute value of the delta touch-down power becomes.

[0068] Figure 3 The relationship between the potential difference between the magnetic head and the magnetic recording medium and the delta touch-down power is shown. As shown in FIG. 6, when the potential difference between the high potential side and the magnetic recording medium in terms of the absolute value of the magnetic head element is -0.7 V and -1.0 V, the delta touch-down power is almost zero. From this figure, it can be said that by supplying a voltage of -0.2 V to -1.0 V, more preferably -0.3 V to -0.7 V, with respect to the potential of the magnetic recording medium to the magnetic head element, the attachment of contaminants to the magnetic head can be reduced. Figure 3

[0069] As described above, the embodiments have been explained, but the above-described embodiments are suggested as examples, and the present application is not limited to the above-described embodiments. The above-described embodiments can be implemented in other various modes, and various combinations, omissions, substitutions, changes, etc. can be made within the scope of the gist of the present application. These embodiments, variations thereof, are included in the scope and gist of the present application, and are included in the scope of the present application and equivalents thereof recited in the claims.

[0070] Explanation of symbols

[0071] 1 Magnetic recording and reproducing apparatus

[0072] 2 Magnetic recording medium

[0073] 3 Motor

[0074] 4 Magnetic head

[0075] 5 Light source

[0076] 7 Voice coil motor

[0077] 8 Head assembly

[0078] 9 Flap

[0079] 21 Non-magnetic substrate

[0080] 22 Magnetic layer

[0081] 23 Carbon protective layer

[0082] 24 Lubricant layer

[0083] 41A, 41B Magnetic head element

[0084] 42A, 42B Electrode ​

[0085] 43 preamplifier

[0086] 44 biasing circuit

Claims

1. A magnetic recording playback device, comprising: Disk-shaped magnetic recording medium; An electric motor that drives the rotation of the magnetic recording medium; A magnetic head, comprising a magnetic head element for reading information from the magnetic recording medium and a magnetic head element for writing the information; and A bias circuit that supplies a predetermined bias voltage to the magnetic head element that reads the information. The magnetic recording medium has a magnetic layer and a carbon protective layer sequentially on the substrate. The bias circuit supplies the magnetic head element with a voltage of -0.7V to -1.0V relative to the magnetic recording medium. A preamplifier that receives information from a first magnetic head element that reads from the magnetic recording medium via a pair of electrodes, and The wiring connects the pair of electrodes to the preamplifier and the bias circuit. The bias circuit supplies a specified voltage to the pair of electrodes.

2. The magnetic recording reproduction apparatus according to claim 1, wherein the magnetic head further comprises a structure for holding the first magnetic head element with a pair of electrodes.

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