KR100446295B1 - Giant magneto resistance head preventing weak write in a low temperature - Google Patents

Abstract

A large magnetoresistive head is disclosed that prevents weak light at low temperatures. The disclosed giant magnetoresistive head has a head region including a predetermined magnetoresistive sensor for reading data and a predetermined pole member wrapped with a magnetic field recording coil for generating a magnetic field for data recording, and is supplied with current prior to data recording. And heating and heat dissipation means provided in front of the head region in proximity to the pole member for heating the organic coil and absorbing and dissipating heat generated from the magnetic field organic coil while data recording is performed. The use of such a giant magnetoresistive head reduces the gap between the head and the magnetic layer on which the data of the hard disk is written, that is, the flying height of the head. You can prevent the weak light. After the write operation is started, by using the heating and heat dissipation means to absorb and dissipate heat generated from a coil inducing a magnetic field for recording in the gap of the head region, excessive formation of the TPTP of the head can be prevented. . As a result, the TPTP of the head is kept uniform throughout the entire write operation, and data can be recorded at high density and at the same time.

Description

Giant magneto resistance head preventing weak write in a low temperature}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetoresistive head provided in a hard disk driver, and more particularly to a giant magneto resistance head having a means for dissipating heat generated from the head while preventing weak writes at low temperatures. Hereinafter referred to as GMR head).

A hard disk drive is one of the auxiliary storage devices of a computer, which reads data recorded in a magnetic layer of a hard disk by a magnetic head, or writes data in the magnetic layer. Recently, various studies have been conducted to realize high speed, high capacity, and low vibration of such a hard disk drive.

1 is a plan view schematically showing a configuration of a general hard disk drive.

Referring to FIG. 1, the hard disk drive 100 records a base 101, a hard disk 102 called a platter for storing data, and writes data to or reads data from the hard disk 102. Voice coil motor (VCM) 104 which provides the driving force for reciprocating the head stack assembly (HSA) 103 and the head stack assembly 103 in the radial direction of the hard disk 102 Consists of

The hard disk 102 generally has a stacking structure of two to four sheets, and its surface has a parking area in which the head 103h is seated when the rotation of the hard disk 102 is stopped and the data area 102r in which data is recorded. parking) area 102p.

The head stack assembly 103 is installed pivotably around a pivot 103p, and has an actuator 103a constituting a main body and a plate-shaped suspension having elastic force connected to the actuator 103a. a suspension 103b and a magnetic head 103h fixed to the end of the suspension 103b to read data recorded on the hard disk 102 or to write data to the hard disk 102.

In addition, the position of the magnetic head 103h when the actuator 103a is parked is specified on one side of the actuator 103a, and the magnetic head 103h is secured in the safe parking area 102p according to the driving and non-driving of the hard disk drive. Damage and damage to the magnetic head 103h and the hard disk 102 by fixing so that the magnetic head 103h does not leave the parking position even when a hard disk drive is not in operation, even if a certain amount of shock from the outside when the hard disk drive is inoperative A latch system is provided to prevent this. Such a latch system includes a latch pin 105 composed of a damper 105d and an iron piece 105m provided at one end of the actuator 103a, and a permanent magnet installed at the base 101 on the movement trajectory of the latch pin 105. It consists of a latch housing of 106.

2 is a perspective view of a head slider including a magnetoresistive head in the hard disk drive having the above structure.

Referring to FIG. 2, the head slider 103h is provided on a main body 201 and one surface of the main body 201, and the first to third air bearing surfaces (ABS) on which air pressure is applied when the hard disk is rotated ( 202a, 202b, and 202c. The magnetoresistive head 202d is included in the first air bearing surface.

The magnetoresistive head 202d is in a stationary state in contact with the hard disk at the beginning of driving, and then reads or writes data while flying at a constant height as the hard disk is rotated.

3 is a rear view of the schematic structure of a magnetoresistive head according to the prior art used for a hard disk drive having the above-described configuration, seen from the gap direction of the head.

Referring to FIG. 3, the magnetoresistive head includes a magnetoresistive sensor 302 for reading data recorded in the magnetic layer of the hard disk. First and second shield materials 300 and 306 are provided on both sides of the magnetoresistive sensor 302 to protect the magnetoresistive sensor 302. First and second pole structures 308 and 310 are provided outside the second shield member 306 to record data on the hard disk. A protrusion that forms a gap 314 having a predetermined width is formed at the center of the first pole structure 308 to face the second pole structure 310. The magnetoresistive sensor 302 is connected with a lead wire 304 for transmitting a change in the magnetoresistance value according to the magnetic flux change on the hard disk detected by the magnetoresistive sensor 302.

Meanwhile, an Au layer 312 is provided in front of the second pole structure 310. The gold layer 312 is for dissipating heat generated from the head.

Referring to FIG. 4, the gold layer 312 is provided to cover the second pole structure 310. A portion of the second pole structure 310 is in contact with the first pole structure 308. First pole structure, which surrounds second pole structure 310 about the contact area of first pole structure 308 and second pole structure 310 between first and second pole structures 308, 310. First and second coils C1 and C2 stacked in parallel with 308 are provided. While a current corresponding to the data to be written to the coils C1 and C2 is supplied, a predetermined magnetic field is formed in the gap 314 between the first and second pole structures 308 and 310. The necessary data is recorded in the data area of the hard disk.

The above-described magnetoresistive head according to the related art can include a gold layer 312 in front of the pole structure to dissipate heat generated from the head, thereby reducing TPTP (Thermal Pole Tip Protrusion) in the writing process to the required level. As a result, side effects resulting from contact between the hard disk and the head caused by TPTP, such as data loss and head damage, can be reduced, but weak writes, which weaken the initial write operation at low temperatures, can be aggravated. Have

Therefore, the technical problem to be achieved by the present invention is to improve the above-described problems of the prior art, by preventing weak writes at the beginning of the write operation to maintain the TPTP of the head uniformly during the entire write operation, thereby recording data at a high density. It is to provide a large magnetoresistive head that can be.

1 is a plan view schematically illustrating a configuration of a general hard disk drive.

FIG. 2 is a perspective view of a head slide including the magnetic head of FIG. 1. FIG.

FIG. 3 is a rear view of the magnetic head included in the head slide of FIG. 2 as viewed in the gap direction.

FIG. 4 is a cross-sectional view of FIG. 3 taken in the 4-4 'direction.

5 is a rear view of a giant magnetoresistive (GMR) head in the gap direction according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along the line 6-6 ′ of FIG. 5.

FIG. 7 is a rear view illustrating a case where the head region is specified in the giant magnetoresistive head according to the embodiment of the present invention shown in FIG. 5 in the gap direction.

FIG. 8 is a cross-sectional view of FIG. 7 taken in the 8-8 'direction.

9 and 10 are plan views illustrating various modified examples of the weak light preventing coil applied to the embodiments illustrated in FIGS. 7 and 8.

* Description of Signs of Major Parts of Drawings *

400, 500: head region 420: heating and heat dissipation means

520: heating and heat dissipation coil

500a, 500c: first and second shield members

500b: magnetoresistive sensor 500d, 500e: first and second pole members

500 g: gap

C1, C2: first and second coils

In order to achieve the above technical problem, the present invention includes a head region including a predetermined magnetoresistive sensor for reading data and a predetermined pole member for generating a data recording magnetic field, and the head region in proximity to the pole member. It provides a magnetoresistive head comprising a heating and heat dissipation means provided in the front.

The predetermined pole member is composed of a first pole member and a second pole member which forms a gap in which the magnetic field is induced with the first pole member and partially contacts the first pole member.

The magnetic field organic coil is provided between the first and second pole members and surrounds the second pole member with respect to the contact portion of the first and second pole members.

A first shield member is provided at a position facing the first pole member with respect to the magnetoresistive sensor.

A second shield member is provided between the magnetoresistive sensor and the first pole member.

The heating and heat dissipation means is a coil that receives a current prior to the data recording to heat the magnetic field organic coil, and absorbs and dissipates heat generated from the magnetic field organic coil as the data recording is performed. A circular spiral coil, a square spiral coil, or a zigzag coil that is proximate to the second pole member in parallel to the first pole member.

When the giant magnetoresistive head according to the present invention is used, the interval between the head and the magnetic layer on which the data of the hard disk is written, that is, the flying height of the head is lowered from the beginning of the write operation. This can prevent weak light from becoming bad or not being recorded normally. After the write operation is started, by using the heating and heat dissipation means to absorb and dissipate heat generated from a coil inducing a magnetic field for recording in the gap of the head region, excessive formation of the TPTP of the head can be prevented. .

As a result, the TPTP of the head is kept uniform throughout the entire write operation, and data can be recorded at high density and at the same time.

Hereinafter, a giant magnetoresistive head according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of layers or regions illustrated in the drawings are exaggerated for clarity.

Referring to FIG. 5 and FIG. 6 showing an incision in the 5-5 'direction, a giant magnetoresistive (GMR) head according to an embodiment of the present invention may be formed on a magnetic layer of a GMR sensor (not shown) and a hard disk. A head region 400 provided with a pole structure (not shown) or the like for generating a predetermined magnetic field on the track for recording the data of the head and heating provided in front of the head region 400 in proximity to the pole structure. And heat dissipation means 420.

The heating and heat dissipation means 420 absorbs and dissipates heat generated from the head region 400 during the operation of the giant magnetoresistive head, for example, while recording data in the magnetic layer of the hard disk. It keeps TPTP to the desired level. By doing so, the flying height of the giant magnetoresistive head, i.e., the gap between the magnetic layer of the hard disk and the giant magnetoresistive head is narrowed so that the recording magnetic field generated from the head is concentrated in a narrow area so that data can be collected at high density. Can record

In addition, the heating and heat dissipation means 420 may be applied to the head region immediately before the write operation is started, especially before the hard disk driver performs a write operation in a low temperature region, which is generally relatively low compared to the temperature. It serves to heat 400.

In general, since the Hc of the magnetic layer of the hard disk becomes large in the low temperature region, in order to record data in the magnetic layer of the hard disk in the low temperature region, a larger current is required than when recording data at room temperature.

By the way, as the write operation proceeds, heat is generated from the head area 400, and the heat forms the TPTP which protrudes a predetermined part of the head area 400, that is, a part directly related to data writing, and as a result, the flying of the head is formed. Since the height becomes small and the write magnetic field generated from the head is concentrated in the narrow region of the low phase layer, the same effect as that of supplying a large current can be obtained.

However, little heat is generated from the head area 400 during the short time at the beginning of recording. Therefore, not only the TPTP is formed at the beginning of the recording, but also the current required for data recording is not particularly large compared with after the initial recording, so weak writes are not normally recorded.

In the case of the present invention, since the head area 400 is forcibly heated immediately before the recording operation is performed by using the heating and heat dissipation means 420 as described above, the state of the head area 400 in the beginning of recording is determined after the beginning of recording. Is heated as a result of, and as a result, TPTP is formed in the head area 400 as after the initial recording even though the initial recording is performed. In this way, weak writes at the beginning of recording are prevented. In other words, data can be recorded normally even at the beginning of recording.

The head region 400 and the heating and heat dissipation means 420 may include various components and may have various shapes. 7 and 8 show an example.

Referring to FIG. 7 when viewed in the direction of the gap, the head region 500 includes a magnetoresistive sensor 500b for reading data recorded in a magnetic layer of a hard disk and a first data used for writing predetermined data on the hard disk. And second pole members 500d and 500e. The magnetoresistive sensor 500b is preferably a giant magnetoresistance (GMR) sensor. There is a gap 500g between the first and second pole members 500d and 500e in which a magnetic field for recording data is generated. The part corresponding to the gap 500g of the 1st pole member 500d protrudes toward the 2nd pole member 500e. A second shield member 500c is provided between the magnetoresistive sensor 500b and the first pole member 500d to protect the magnetoresistive sensor 500b. The first shield member 500a for protecting the magnetoresistive sensor 500b is provided at a position facing the second shield member 500c around the magnetoresistive sensor 500b.

On the other hand, the heating and heat which plays the same role as the heating and heat dissipation means 420 shown in FIG. 5 or 6 at a position proximate the second pole member 500e in front of the head region 500 including the above components. The dissipation coil 520 is provided. The heating and heat dissipation coil 520 is provided between the first and second pole members 500d and 500e to heat a coil which induces a recording magnetic field in the gap 500g immediately before performing a recording operation. It serves to absorb and dissipate heat generated from a coil inducing the recording magnetic field while the operation is performed. Accordingly, immediately before the recording operation is performed, a predetermined current (eg, several tens to several tens) is supplied to the heating and heat dissipation coil 520 for heating the coil inducing the recording magnetic field. The current supply is interrupted and the heat generated from the coil inducing the magnetic field to which the current is supplied is absorbed and dissipated.

Referring to FIG. 8, a part of the second pole member 500e is in contact with the first pole member 500d. The portion of the second pole member 500e that is in contact with the first pole member 500d and the gap 500g is convexly curved in the direction of the heating and heat dissipation coil 520. First and non-contacting surroundings of the second pole member 500e around a portion where the first and second pole members 500d and 500e contact between the first and second pole members 500d and 500e. The second coils C1 and C2 are stacked. The first and second coils C1 and C2 are coils that receive a current and induce a recording magnetic field in the gap 500g. The first and second coils C1 and C2 are stacked in parallel with the first pole member 500d. Between the first and second shield members 500a and 500c and the magnetoresistive sensor 500b and the first and second pole members 500d and 500e and the first and second coils C1 and C2 are filled with an insulating material. have.

In FIG. 8, a first passage passing outside the contact portion compared to the cross-sectional area of the first and second coils C1 and C2 passing between the contact portion of the first and second pole members 500d and 500e and the gap 500g. And the cross sections of the second coils C1 and C2 are wide, which lowers the resistance of the first and second coils C1 and C2 to generate heat generated from the first and second coils C1 and C2. Is to reduce.

The heating and heat dissipation coil 520 provided adjacent to the second pole member 500e and parallel to the first pole member 500d is preferably a circular spiral coil, but is a rectangular spiral as shown in FIG. 9. A coil or a zigzag coil as shown in FIG. 10 may be used. The cross-sectional area of the heating and heat dissipation coil is preferably the same in any area, but the cross-sectional area of the area where the cross-sectional area of the area corresponding to the portion where the gap 500g and the first and second pole members 500d and 500e contact each other is different. It can be narrower than that.

While many details are set forth in the foregoing description, they should be construed as illustrative of preferred embodiments, rather than to limit the scope of the invention. For example, a person having ordinary knowledge in the technical field to which the present invention belongs may have a head region having a configuration different from that of the head region 500 shown in FIGS. 7 and 8, and a magnet composed of the above-described heating and heat dissipation means. It may be possible to implement a resistive head. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the technical spirit described in the claims.

As described above, the giant magnetoresistive head according to the present invention heats a coil for inducing a magnetic field for data recording in the gap 500g between the first and second pole members 500d and 500e just before the recording operation is performed. And heating and heat dissipation means in front of the pole member for absorbing and dissipating heat generated from the coil during the recording operation. By using such a large magnetoresistive head, the head can be heated in the same manner as after the write operation is executed before the write operation is performed. Therefore, the write operation is started in the low temperature region and the write operation of the head TPTP is performed. It can be formed in the same manner as the TPTP shown later. In this way, since the interval between the head and the magnetic layer on which the data of the hard disk is recorded, that is, the flying height of the head, becomes lower from the start of the write operation, the weak write or the weak write cannot be performed at the beginning of the write operation. You can prevent it. After the write operation is started, by using the heating and heat dissipation means to absorb and dissipate heat generated from a coil inducing a magnetic field for recording in the gap of the head region, excessive formation of the TPTP of the head can be prevented. .

As a result, by providing the heating and heat dissipation means of the present invention, it is possible to maintain the TPTP of the head uniformly during the entire write operation so that data can be recorded normally and data can be recorded with high density.

Claims (5)

A head region comprising a predetermined magnetoresistive sensor for reading data and a predetermined pole member wrapped with a magnetic field recording coil for generating a data recording magnetic field; And Heating provided in front of the head region in close proximity to the pole member for receiving current and heating the magnetic field coils before data recording and absorbing and dissipating heat generated from the magnetic field coils as data recording is performed. And heat dissipation means. The method of claim 1, wherein the predetermined pole member, A first pole member; And And a second pole member which forms a gap in which the first pole member and the magnetic field are induced and is partially in contact with the first pole member. The magnetoresistive head of claim 2, wherein the magnetic field coil surrounds the second pole member centered on a contact portion of the first and second pole members between the first and second pole members. . The magnetoresistive head according to claim 2, wherein the heating and heat dissipation means is a coil. 5. The magnetoresistive head of claim 4, wherein the coil is a circular spiral coil, a square spiral coil, or a zigzag coil that is proximate to the second pole member in parallel to the first pole member.