Invention Grant
US08015694B2 Method for making a scissoring-type current-perpendicular-to-the-plane (CPP) magnetoresistive sensor
有权
用于制造剪切型电流 - 垂直于平面(CPP)磁阻传感器的方法
- Patent Title: Method for making a scissoring-type current-perpendicular-to-the-plane (CPP) magnetoresistive sensor
- Patent Title (中): 用于制造剪切型电流 - 垂直于平面(CPP)磁阻传感器的方法
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Application No.: US11959102Application Date: 2007-12-18
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Publication No.: US08015694B2Publication Date: 2011-09-13
- Inventor: Matthew J. Carey , Jeffrey R. Childress , Stefan Maat , Neil Smith
- Applicant: Matthew J. Carey , Jeffrey R. Childress , Stefan Maat , Neil Smith
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Agent Thomas R. Berthold
- Main IPC: G11B5/127
- IPC: G11B5/127 ; H04R31/00

Abstract:
A “scissoring-type” current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with dual ferromagnetic sensing or free layers separated by a nonmagnetic spacer layer has improved stability as a result of etch-induced uniaxial magnetic anisotropy in each of the free layers. Each of the two ferromagnetic free layers has an etch-induced uniaxial magnetic anisotropy and an in-plane magnetic moment substantially parallel to its uniaxial anisotropy in the quiescent state, i.e., the absence of an applied magnetic field. The etch-induced uniaxial anisotropy of each of the free layers is achieved either by direct ion etching of each of the free layers, and/or by ion etching of the layer on which each of the free layers is deposited. A strong magnetic anisotropy is induced in the free layers by the etching, which favors generally orthogonal orientation of the two free layers in the quiescent state.
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