Seagate Technology Incorporated

Vladyslav Alexandrovich Vas'ko

Mark Thomas Kief

Venkateswara R Inturi

Michael C Kautzky

Yifan Zhang

Zhihong Lu

Kaizhong Gao

Eric Walter Singleton

Mark William Covington

Alexander Mikhailovich Shukh

Yonghua Chen

Qing I He

Wonjoon Jung

Jiaoming Qiu

Zhongyan Wang

Richard P Michel

Dehua Han

Beverley Craig

A magneto-resistive reader includes a first magnetic shield element, a second magnetic shield element and a magneto-resistive sensor stack separating the first magnetic shield element from the second magnetic shield element. The first shield element includes two ferromagnetic anisotropic layers separated by a grain growth suppression layer.

Magnetic sensor with composite magnetic shield

A magnetoresistive sensor is generally disclosed. Various embodiments of a sensor can have at least a trilayer sensor stack biased with a back biasing magnet adjacent a back of the trilayer sensor. The back biasing magnet, the trilayer sensor stack, or both have substantially trapezoidal shapes to enhance the biasing field and to minimize noise.

Trapezoidal back bias and trilayer reader geometry with predetermined magnetization shape

Various embodiments of the present invention are generally directed to a magnetically responsive lamination that may be constructed with a spacer layer disposed between a first and second ferromagnetic free layer. At least one ferromagnetic free layer can have a coupling sub-layer that enhances magnetoresistance ratio (MR) of the magnetically responsive lamination.

Magnetic sensor with enhanced magnetoresistance ratio

A method and apparatus having magnetic properties. The apparatus includes a main pole and a return pole spaced apart from the main pole. The return includes at least one multilayer block having a plurality of alternating layers of magnetic material and non-magnetic material. The return pole also includes a single magnetic material layer coupled to the at least one multilayer block. The magnetic material layer has a permeability that is greater than a permeability of the at least one multilayer block.

Perpendicular recording head having controlled permeability and saturation moment

A read head shield having improved stability includes a ferromagnetic (FM) layer and an anti-ferromagnetic (AFM) layer adjacent the FM layer. The FM layer has a patterned shape and a domain configuration that is defined by a plurality of local magnetic domains that are stabilized in accordance with the patterned shape. The AFM layer is annealed to imprint thereon the stabilized local magnetic domains of the FM layer. The AFM layer operates to increase the stability of the domain configuration of the FM layer thereby providing improved resistance to domain configuration shift caused by the application of a strong magnetic field.

Read head shield having improved stability

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Apple Valley, MN, United States of America

Vladyslav Alexandrovich Vas'ko