Invention Grant
- Patent Title: Perpendicular magnetic recording disk with multiple magnetic layers and intermediate dual nucleation films for control of grain size
- Patent Title (中): 具有多个磁性层的垂直磁记录盘和用于控制晶粒尺寸的中间双核成膜
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Application No.: US13156272Application Date: 2011-06-08
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Publication No.: US09040180B2Publication Date: 2015-05-26
- Inventor: Ernesto E. Marinero , Dieter K. Weller , Brian R. York
- Applicant: Ernesto E. Marinero , Dieter K. Weller , Brian R. York
- Applicant Address: NL Amsterdam
- Assignee: HGST Netherlands B.V.
- Current Assignee: HGST Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Agent Thomas R. Berthold
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
A perpendicular magnetic recording disk has a graded-anisotropy recording layer (RL) formed of at least two ferromagnetically exchange coupled CoPtCr-oxide magnetic layers (MAG1 and MAG2) with two nucleation films (NF1 and NF2) between the magnetic layers. NF1 is a metal film, preferably Ru or a Ru-based alloy like RuCr, sputter deposited on MAG1 at low pressure to a thickness between about 0.1-1.5 nm. NF2 is a metal oxide film, preferably an oxide of Ta, sputter deposited on NF1 at high pressure to a thickness between about 0.2-1.0 nm. MAG2 is sputter deposited over NF2. NF1 and NF2 provide a significant reduction in average grain size in the RL from a graded-anisotropy RL without nucleation films between MAG1 and MAG2, while also assuring that MAG1 and MAG2 are strongly exchange coupled.
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