公开(公告)号：US5264980A

公开(公告)日：1993-11-23

申请号：US388690

申请日：1989-08-02

申请人： Greg S. Mowry ,  Terry B. Mitchell

发明人： Greg S. Mowry ,  Terry B. Mitchell

IPC分类号： G11B5/39 ,  G11B5/127

CPC分类号： G11B5/3903

摘要： A method of establishing a single domain in a magnetoresistive sensor positioned in a gap between two shield layers of magnetic material. The method includes the steps of heating the magnetoresistive head above the Neel temperature of at least one of the shield layers of magnetic material. Applying an external magnetic field to the magnetoresistive sensor and the shield layers for establishing a single magnetic domain in the magnetoresistive sensor. Reducing the intensity of the external magnetic field for holding the magnetization of the magnetoresistive sensor during cooling. Cooling the magnetoresistive head.

公开(公告)号：US4967298A

公开(公告)日：1990-10-30

申请号：US414941

申请日：1989-09-29

申请人： Greg S. Mowry

发明人： Greg S. Mowry

IPC分类号： G01R33/09 ,  G11B5/39

CPC分类号： G11B5/3903 ,  G01R33/09 ,  G01R33/096

摘要： An elongated magnetoresistive sensor strip longitudinally biased to maintain a single domain sense region by exchange-biasing material atomically coupled to the strip at the ends of the strip outside of a central sense region. The magnetoresistive sense strip is included in a magnetic head which has a leading pole, a trailing pole, and a shield. A first gap is located between the leading pole and the trailing pole and a second gap is located between the trailing pole and the shield with the sense strip located in the second gap.

摘要翻译： 纵向偏置的细长磁阻传感器条，以通过在中心感测区域外的条带的端部处原子地耦合到条带的交换偏置材料来维持单个畴感测区域。 磁阻感应条被包括在具有前导极，后极和屏蔽的磁头中。 第一间隙位于引导极和后极之间，并且第二间隙位于后极和屏蔽之间，感测条位于第二间隙中。

公开(公告)号：US4841398A

公开(公告)日：1989-06-20

申请号：US15200

申请日：1987-02-17

申请人： Greg S. Mowry

发明人： Greg S. Mowry

IPC分类号： G01R33/09 ,  G11B5/09 ,  G11B5/39

CPC分类号： G11B5/398 ,  G01R33/09 ,  G01R33/096 ,  G11B5/09 ,  G11B5/3903

摘要： A non linear magnetoresistive sensor having a magnetoresistive strip with no transverse biasing (either permanent or current) such that the sensor is operated in its non linear mode. The sensor is useful in its non linear mode to determine the location of pulse peaks from encoded data from a medium by differentiating and determining the zero crossings of the detected signal.

公开(公告)号：US5776537A

公开(公告)日：1998-07-07

申请号：US794421

申请日：1997-02-05

申请人： Patrick J. Ryan ,  Zhijun Yang ,  Greg S. Mowry

发明人： Patrick J. Ryan ,  Zhijun Yang ,  Greg S. Mowry

IPC分类号： G01R33/09 ,  H01F41/30 ,  B05D5/12

CPC分类号： B82Y25/00 ,  B82Y40/00 ,  G01R33/093 ,  H01F41/302

摘要： An MR sensor includes an MR layer and permanent magnets defining an active area on the MR layer. A bi-layer test structure is fabricated with a permanent magnet layer deposited on a substrate and an MR layer deposited on the permanent magnet layer. If desired, a SAL may be deposited prior to deposition of the permanent magnet layer. A DC magnetic field is applied to the bi-layer test structure, and the strength of the DC magnetic field is varied. During application of the DC magnetic field, the magnetic response of the bi-layer test structure is measured to determine a hysteresis loop of the bi-layer structure. The exchange coupling between the permanent magnet layer and the MR layer is characterized by a point of inflection identified on the measured hysteresis loop.

摘要翻译： MR传感器包括MR层和限定MR层上的有效区域的永磁体。 制造双层测试结构，其中沉积在基底上的永磁体层和沉积在永磁体层上的MR层。 如果需要，在沉积永磁体层之前可以沉积SAL。 直流磁场被施加到双层测试结构，并且直流磁场的强度是变化的。 在施加直流磁场期间，测量双层测试结构的磁响应以确定双层结构的磁滞回线。 永磁体层和MR层之间的交换耦合的特征在于在测量的磁滞回线上识别的拐点。

公开(公告)号：US4891725A

公开(公告)日：1990-01-02

申请号：US221479

申请日：1988-07-19

申请人： Greg S. Mowry

发明人： Greg S. Mowry

IPC分类号： G01R33/09 ,  G11B5/39

CPC分类号： G11B5/3903 ,  G01R33/09 ,  G01R33/096

摘要： An elongated magnetoresistive sensor strip longitudinally biased to maintain a single domain sense region by exchange-biasing material atomically coupled to the strip at the ends of the strip outside of a central sense region.

摘要翻译： 纵向偏置的细长磁阻传感器条，以通过在中心感测区域外的条带的端部处原子地耦合到条带的交换偏置材料来维持单个畴感测区域。

公开(公告)号：US4803580A

公开(公告)日：1989-02-07

申请号：US15204

申请日：1987-02-17

申请人： Greg S. Mowry

发明人： Greg S. Mowry

IPC分类号： G11B5/31 ,  G11B5/265 ,  G11B5/39 ,  G11B5/127 ,  G11B5/33

CPC分类号： G11B5/3903

摘要： A magnetoresistive head having separate write and read gaps including a leading write pole, a trailing write/shield pole, and a following shield pole, wherein an elongated magnetoresistive sensor strip having a central sense region is mounted in the read gap, and further wherein the leading write pole has a length corresponding to the central sense region of the sensor and defines a track width, and the trailing/shield pole and following shield are the same length as the overall length of the magnetoresistive sensor strip.