Invention Grant
- Patent Title: Low noise magnetic head for high frequency recording
- Patent Title (中): 低噪音磁头用于高频录音
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Application No.: US607130Application Date: 1996-02-26
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Publication No.: US5792547APublication Date: 1998-08-11
- Inventor: Francis H. Liu , Minshen Tan , Hua-Ching Tong
- Applicant: Francis H. Liu , Minshen Tan , Hua-Ching Tong
- Applicant Address: CA Milpitas
- Assignee: Read-Rite Corporation
- Current Assignee: Read-Rite Corporation
- Current Assignee Address: CA Milpitas
- Main IPC: G11B5/31
- IPC: G11B5/31 ; G11B5/39 ; H01F10/32 ; G11B5/127
Abstract:
A laminated pole structure for use in a low noise magnetic head suitable for high frequency signal operation is formed by interleaving a plurality of ferromagnetic layers and electrically insulating antiferromagnetic layers so as to form interface surfaces therebetween. External magnetic fields are applied as the interface surfaces are being formed for establishing exchange anisotropies with predetermined permanent exchange pinning directions in the ferromagnetic layers. The exchange anisotropies may be in the same or opposite directions, as defined by the external magnetic fields. In one embodiment, the pole structure has an open edge lamination, while in another embodiment the pole structure has a closed edge lamination. In still another embodiment, the antiferromagnetic layers include predetermined patterns of nonmagnetic material.
Information query
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