Headway Technologies, Incorporated

Ben Hu

Min Li

Kochan Ju

Lijie Guan

Jeiwei Chang

Youfeng Zheng

Single write poles tend to large shape anisotropy which results in a very large remnant field when not actually writing. This has now been eliminated by giving the write pole the form of a three layer laminate in which two ferromagnetic layers are separated by a non-magnetic or antiferromagnetic coupling layer. Strong magnetostatic coupling between the outer layers causes their magnetization directions to automatically be antiparallel to one another, unless overcome by the more powerful write field, leaving the structure with a low net magnetic moment. The thickness of the middle layer must be carefully controlled.

Thin laminated single pole perpendicular write head

A GMR sensor comprising a sensor element having a spin valve configuration with a synthetic antiferromagnetic pinned layer and further comprising a ferromagnetic free layer biased by synthetic exchange biasing in a direction canted relative to the air bearing surface plane of the sensor. The resulting GMR sensor has a stable free layer domain structure, stable bias point and a wide dynamic range.

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Los Altos, CA, United States of America

Ben Hu