Invention Grant
- Patent Title: Soft underlayer structure for magnetic recording
- Patent Title (中): 软底层结构用于磁记录
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Application No.: US11008712Application Date: 2004-12-09
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Publication No.: US07378164B1Publication Date: 2008-05-27
- Inventor: Bruce Lairson , Mourad Benakli
- Applicant: Bruce Lairson , Mourad Benakli
- Applicant Address: US CO Longmont
- Assignee: Maxtor Corporation
- Current Assignee: Maxtor Corporation
- Current Assignee Address: US CO Longmont
- Agency: Cesari and McKenna, LLP
- Main IPC: G11B5/667
- IPC: G11B5/667 ; G11B5/673

Abstract:
A magnetic recording medium having a soft magnetic underlayer structure that includes two soft underlayers is presented. A thick first soft underlayer, disposed on the medium substrate, is made of material which provides a low magnitude of magnetization saturation (Bsat) and high permeability. The first soft underlayer can be formed by plating or high-rate sputtering. The second soft underlayer, which has a lesser thickness than the first soft underlayer, is made of a material which provides a relatively high magnitude of Bsat and low permeability. The second soft underlayer can be formed by low-rate sputtering. The first soft under layer can be isolated from other layers in the medium by an exchange isolation layer. The second soft underlayer can be exchange coupled to a radial exchange pin layer disposed on the exchange isolation layer.
Information query
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