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公开(公告)号：WO02101731A3
公开(公告)日：2003-05-22
申请号：PCT/GB0202667
申请日：2002-05-30
Inventor： GILL HARDAYAL SINGH
CPC classification number: B82Y25/00 , B82Y10/00 , G11B5/3133 , G11B5/3909 , G11B5/3919 , G11B5/3925 , G11B5/3967 , G11B5/40 , G11B2005/3996
Abstract: A read head includes electrically conductive ferromagnetic first (Y1, 226) and second (Y2, 228) yoke layers and a tunnel valve sensor (201) which is recessed from the ABS and is located between the first and second yoke layers. The first and second yoke layers extend to an air bearing surface (ABS) for conducting flux to the sensor and extend into the head beyond the sensor. A bottom copper structure (246) interfaces a bottom surface of the tunnel valve sensor and a top copper structure (248) interfaces a top surface of the tunnel valve sensor. In a first embodiment of the invention, the first and second copper structures conduct heat from the sensor to the first and second yoke layers respectively, and in a second embodiment of the invention the bottom copper structure conducts heat to a substrate (245) while the top copper structure conducts from the sensor to the second yoke layer. Further, in the first embodiment the first and second yoke layers serve as leads for a tunneling current while in the second embodiment the bottom copper structure and the second yoke layer serve as leads for the tunneling current.
Abstract translation: 读头包括导电铁磁第一（Y1,226）和第二（Y2,228）磁轭层和从ABS凹入并位于第一和第二磁轭层之间的隧道阀传感器（201）。 第一和第二磁轭层延伸到空气轴承表面（ABS），用于将助焊剂传导到传感器并延伸到头部超过传感器。 底部铜结构（246）与隧道阀传感器的底表面接合，顶部铜结构（248）与隧道阀传感器的顶表面相接。 在本发明的第一实施例中，第一和第二铜结构分别将热量从传感器传导到第一和第二磁轭层，并且在本发明的第二实施例中，底部铜结构将热量传导到衬底（245），而 顶部铜结构从传感器传导到第二磁轭层。 此外，在第一实施例中，第一和第二磁轭层用作隧道电流的引线，而在第二实施例中，底部铜结构和第二磁轭层用作隧道电流的引线。
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公开(公告)号：WO02054097A3
公开(公告)日：2002-09-12
申请号：PCT/GB0105793
申请日：2001-12-24
Inventor： GILL HARDAYAL SINGH
IPC: G01R33/09
CPC classification number: B82Y25/00 , G01R33/093
Abstract: An antiparallel (AP)-pinned spin valve (SV) sensor is provided with an AFM layer of Pt-Mn having a thickness less than 10 nanometres and using the magnetic field of the sense current to assist the AFM layer in pinning the magnetization of the AP-pinned layer. The SV sensor has positive and negative read signal symmetry about a zero bias point of a transfer curve due to the influences of the a net sense current field, a ferromagnetic coupling field and a demagnetization field being counterbalanced by a net image field from asymmetric positioning of the SV sensor between first and second shield layers. The SV sensor includes an AP-pinned layer with first and second ferromagnetic pinned layers where the second pinned layer adjacent to a spacer layer is thicker than the first pinned layer. The direction of the sense current is chosen so that its magnetic field at the pinned layer is in the same direction as the magnetization of the thicker second pinned layer so as to assist in pinning of the AP-pinned layer to provide stable operation of the SV sensor.
Abstract translation: 具有厚度小于10纳米的Pt-Mn的AFM层并且使用感测电流的磁场来辅助AFM层钉扎磁化的反平行（AP） - 平头旋转阀（SV）传感器 AP固定层。 由于净感应电流场，铁磁耦合场和退磁场的影响，SV传感器具有关于传递曲线的零偏置点的正读取信号和负读取信号对称性，其中净磁场来自非对称定位 第一和第二屏蔽层之间的SV传感器。 SV传感器包括具有第一和第二铁磁固定层的AP固定层，其中邻近间隔层的第二固定层比第一固定层厚。 感测电流的方向被选择为使得其钉扎层处的磁场与较厚的第二钉扎层的磁化处于相同的方向，从而有助于钉扎AP钉扎层以提供SV的稳定操作 传感器。
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公开(公告)号：JPH1186233A
公开(公告)日：1999-03-30
申请号：JP19300698
申请日：1998-07-08
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To obtain a spin valve sensor having a pinning layer improving heat stability and not adversely influencing coercive force of a free layer, a magnetic head and a manufacture and a magnetic disk drive. SOLUTION: A spin valve sensor has a spacer layer 204 held between a free layer 202 and a pin stop layer 206. The pin stop layer 206 is fixed by a pinning layer 302 of a material of high coercive force and low magnetic moment. The high coercive force fixes the pin stop layer 206, while the low magnetic moment compensates for a stray magnetic field without adversely influencing the coercive force of the free layer 202. The magnetic moment is preferably smaller than 300 emu/cc and the coercive force preferably exceeds 5000 e. A magnetic orientation of the pin stop layer 206 is set at room temperatures by a magnetic field which can be applied at a suspension level. The material that can form the pinning layer 302 using a hard magnetic material H.M. is amorphous TbFeCo and CoSm, and CoPtCr which is not amorphous.
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4.发明专利
公开(公告)号：JPH10334420A
公开(公告)日：1998-12-18
申请号：JP11845498
申请日：1998-04-28
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
IPC: G11B5/39
Abstract: PROBLEM TO BE SOLVED: To provide a read sensor including plural symmetric spin valves whose magnetization directions are resettable. SOLUTION: A first spin valve 102 has an antiferromagnetic layer 106, a ferromagnetic pinning layer 107, a non-magnetic conductive layer 108 and a ferromagnetic free layer 109. The ferromagnetic free layer 109 is shared by first and second spin valves 102, 104. An exchange-coupling layer 112 develops an exchange-coupling for pinning magnetization directions of ferromagnetic pinning layers 111, 113 holding the layer 112 anti-parallelly. The exchange combination makes proper pulse currents pass through conductive layers to apply magnetization directions to antiferromagnetic layers and pins ferromagnetic pining layers being at outer sides of first and second spin valves. Then, the ferrormagnetic pinning layer 111 being at the inner side of the second spin valve is set by the strong exchange-coupling between these two layers.
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5.发明专利
公开(公告)号：JP2002230723A
公开(公告)日：2002-08-16
申请号：JP2001348611
申请日：2001-11-14
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To provide an improved magnetic head for a hard disk drive, having a lead element overlaid reading head component wherein a passive area in a free magnetic layer area is fixed. SOLUTION: A thin layer constituted of a magnetic material of a hard bias layer material and the like is newly deposited at an upper part of a free magnetic layer 68 of a GMR head, in the passive area under the overlaid lead element. When the layer of a hard bias element 88 is magnetically initialized, the magnetic field generated in the new thin film layer acts so a to be fixed to the passive area of the free magnetic layer 68. Since the passive area of the free magnetic layer 68 is magnetically fixed, the movement characteristics of the reading head 120 is not affected by a side face reading magnetic field from an adjacent data track. Thereby, noise and subsidiary reading effect are reduced and the performance of the reading head 120 is improved.
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Patent Agency Ranking
公开(公告)号：JP2002163807A
公开(公告)日：2002-06-07
申请号：JP2001311156
申请日：2001-10-09
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To provide a read head with little risk of the short circuit between layers after lapping the read head to an air bearing surface(ABS). SOLUTION: The read head with an air bearing surface(ABS) comprises a first leg and a second leg mutually connected in the place of distance d1 from ABS in a head, and a yoke such that the first and second leg are located on ABS and have a first and a second end edge estranged only distance d2, respectively. The first and the second leg have a first and a second separation, respectively, which separate magnetically and electrically the leg part of respective legs and are located in between ABS and distance d1. A first sensor is connected magnetically and electrically to the first leg through the first separation, and a second sensor is connected magnetically and electrically to the second leg through the second separation. The first sensor has a first pin layer structure, and a second sensor has a second pin structure, and the first and second pin structures has a first and second magnetic moment facing to each other in anti-parallel, respectively.
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公开(公告)号：JPH10149516A
公开(公告)日：1998-06-02
申请号：JP26664697
申请日：1997-09-30
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To provide method and means for detecting and substantially removing a thermal asperity phenomenon in disk drive by using a magneto-resistive read sensor. SOLUTION: A disk drive system is provided with a magneto-resistive(MR) sensor having four leads, and two leads 438, 440 impart detection currents to an MR layer 436, and two leads 448, 450 impart the currents to a soft adjacent layer(SAL) 454. The MR layer 436 and hard bias layers 442. 444 are insulated electrically from the SAL 454 by an insulation body 452. By that voltages (voltage by existence of thermal asperity and the voltage by the existence of data magnetic field) applied to the MR layer and the SAL (the voltage by the existence of the thermal asperity) are applied to an input of a differential amplifier 580, a thermal asperity signal is removed substantially.
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公开(公告)号：JPH10116404A
公开(公告)日：1998-05-06
申请号：JP21469697
申请日：1997-08-08
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To unnecessitate an antiferromagnetic layer for orientating magnetization. SOLUTION: A non-magneto-conductive spacer layer 146 is interposed between a ferromagnetic free layer 142 and a pinning layer 144. For magnetic coupling between the free layer and the pinning layer, when a detecting current IS is made to flow, ferromagnetic coupling magnetic field HPC oriented to a first direction is generated and floated demagnetizing magnetic field HDEMAG induced in the free layer from the pinning layer is also generated. A first magnetic flux guide is magnetically coupled to the first end face of the layer on an air bearing surface ABS, a second magnetic flux guide is magnetically coupled to the second end face of the free layer set far back from the ABS and the influence of demagnetization HDEMAG to the free layer is minimized. The detecting current magnetic field from the pinning layer cancels the ferromagnetic coupling to the free layer and the detecting current magnetic field from the free layer is added to the ferromagnetic coupling to the pinning layer. The magnetic moment 149 of the free layer is freely rotated and the magnetic moment of the pinning layer is pinned in the direction 147.
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公开(公告)号：JP2001332783A
公开(公告)日：2001-11-30
申请号：JP2001077277
申请日：2001-03-16
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To provide a novel structure for a spin valve magnetic converter, especially a spin valve sensor, for reading out an information signal from a magnetic medium and a magnetic recorder, i.e., a disc drive, comprising such a sensor. SOLUTION: The spin valve sensor has a lower structure arranged to increase the GMR coefficient utilizing a seed layer arrange crystallographically in one embodiment or utilizing an improved pin anchor layer in other embodiment. These improvements can be attained by preventing current shunt of a sensing layer and softening of the sensing layer and the pin anchor layer through a uniform layer texture. The improved seed layer according to the invention can be formed of a face-centered-cubic(FCC) structure having a (111) crystallographic plane parallel with an underlying substrate. One material being employed preferably in the seed layer is Ni42Fe50Nb8.
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公开(公告)号：JPH117614A
公开(公告)日：1999-01-12
申请号：JP10980598
申请日：1998-04-20
Applicant: IBM
Inventor： GILL HARDAYAL SINGH
Abstract: PROBLEM TO BE SOLVED: To provide a thin film magnetic reluctance(MR) spin-bulb read-in sensor having symmetrical positive and negative read-in signals regarding zero- bias point on the transfer characteristic curve when magnetic incursion of equal intensity either in positive or negative is perceived from shifting magnetic medium. SOLUTION: The ferromagnetic free layer 110 of MR spin-bulb read-in sensor 53b has magnetic moment 156 freely rotating from a position corresponding to a zero-bias point when the positive and negative incursion is perceived to the first and second directions. The anti-ferromagnetic layer 122 contacts the anti-parallel pin layer 112 and pins the magnetic moment 124, 126 along the pin direction. The electric conductive nonmagnetic spacer layer 114 intervenes between the free layer and the anti-parallel pin layer. When the positive and negative magnetic incursison is perceived, the magnetic moment of free layer rotates in the first and second directions corresponding to the direction of pin of magnetic moment of pin layer. Thereby, the magnetic reluctance increases or decreases respectively.
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