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Title: Ion beam modification of exchange coupling to fabricate patterned media
Authors: Ranjbar, M.
Piramanayagam, S.N.
Sbiaa, R.
Aung, K.O.
Guo, Z.B.
Chong, T.C. 
Keywords: Antiferromagnetically coupled media
Focused ion beam
Magnetic materials
Issue Date: Mar-2011
Citation: Ranjbar, M., Piramanayagam, S.N., Sbiaa, R., Aung, K.O., Guo, Z.B., Chong, T.C. (2011-03). Ion beam modification of exchange coupling to fabricate patterned media. Journal of Nanoscience and Nanotechnology 11 (3) : 2611-2614. ScholarBank@NUS Repository.
Abstract: For bit-patterned media, media with low remanent magnetization (M r) and high M r 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 M r states using a medium that is at a low M r state to start with. The low M r 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 M r regions. AFM and MFM observations indicated that patterned regions of low and high M r can be observed with ion beam irradiation. This technique is a potential method to achieve patterned media without the need of planarization techniques. © 2011 American Scientific Publishers.
Source Title: Journal of Nanoscience and Nanotechnology
ISSN: 15334880
DOI: 10.1166/jnn.2011.2704
Appears in Collections:Staff Publications

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