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US 2010/0247966 A1Published application
Tunneling magneto-resistive spin valve sensor with novel composite free layer
AssigneeHeadway Technologies, Inc.
InventorsTong Zhao, Hui-Chuan Wang, Chyu-Jiuh Torng
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Abstract
The conventional free layer in a TMR read head has been replaced by a composite of two or more magnetic layers, one of which is iron rich The result is an improved device that has a higher MR ratio than prior art devices, while still maintaining free layer softness and acceptable magnetostriction. A process for manufacturing the device is also described.
Claims3
A free layer for use with an MTJ, comprising:
- an FL1 layer comprising one or more elements selected from the group consisting of Co, Fe, and Ni;
- and
- on said FL1 layer, an FL2 layer containing at least 50 atomic percent of iron, said FL1 and FL2 layers together constituting said free layer.
Dependencies are inferred from the claim text.