Invention Grant
- Patent Title: High performance perpendicular magnetic granular media consisting of multiple exchange control layers
- Patent Title (中): 由多个交换控制层组成的高性能垂直磁性粒状介质
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Application No.: US14603258Application Date: 2015-01-22
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Publication No.: US09129638B1Publication Date: 2015-09-08
- Inventor: Gunn Choe , Yoshihiro Ikeda
- Applicant: HGST Netherlands B.V.
- Applicant Address: NL Amsterdam
- Assignee: HGST Netherlands B.V.
- Current Assignee: HGST Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Agency: Allerman Hall McCoy Russell & Tuttle LLP
- Main IPC: G11B11/00
- IPC: G11B11/00 ; G11B11/105 ; G11B5/66 ; G11B5/667
Abstract:
A perpendicular magnetic recording media comprises a substrate, a first magnetic oxide layer, a first exchange control layer, a second magnetic oxide layer, a second exchange control layer, and a magnetic cap layer positioned above the substrate, in this order. The first magnetic oxide layer may have an anisotropy energy (Ku) between 6×106 and 8×106 erg/cm3, and a magnetization (Ms) between 600 and 800 emu/cm3. The second magnetic oxide layer may have a Ku between 5×106 and 8×106 erg/cm3, and an Ms between 550 and 750 emu/cm3. The first exchange control layer may have an Ms between 0 and 100 emu/cm3. The second exchange control layer may have an Ms between 0 and 40 emu/cm3.
Information query
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