Ion Beam Modification of Exchange Coupling to Fabricate Patterned Media
Abstract:For bit-patterned media, media with low remanent magnetization (Mr) and high Mr regions are needed for storing information, which is usually achieved by lithographically defining magnetic and non-magnetic regions. In this work, we have investigated the use of ion beam modification of media surface to define the low and high Mr states using a medium that is at a low Mr state to start with. The low Mr state is achieved by the use of synthetic antiferromagnetic coupling obtained in Co-alloy/Ru/Co-alloy trilayer structured film. Local ion beam modification at 30 keV energy using Ga+ ions was used to create high Mr regions. AFM and MFM observations indicated that patterned regions of low and high Mr can be observed with ion beam irradiation. This technique is a potential method to achieve patterned media without the need of planarization techniques.
Document Type: Research Article
Publication date: March 1, 2011
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