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Title: High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
Authors: Dutta, Tanmay
Piramanayagam, S. N.
Saifullah, M. S. M.
Bhatia, C. S.
Keywords: Magnetic devices
Chemical compounds
Issue Date: 2017
Source: Dutta, T., Piramanayagam, S. N., Saifullah, M. S. M., & Bhatia, C. S. (2017). High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers. Applied Physics Letters, 111(4), 042405-.
Series/Report no.: Applied Physics Letters
Abstract: Satisfying the mutually conflicting requirements of easy switchability and high thermal stability still remains a hindrance to achieving ultra-high areal densities in hard disk drives. Exchange coupled composite media used with proper exchange control layers (ECLs) presents a potential solution to circumvent this hindrance. In this work, we have studied the role of MgO and Ta ECLs of different thicknesses in reducing the switching field of FePt media. MgO ECL was found to be more effective than a Ta ECL. For a 2 nm MgO ECL, the switching field could be reduced by 41% and at the cost of only a limited loss in thermal stability. Furthermore, a very high switching efficiency of 1.9 was obtained using 2 nm MgO ECL. So, with a proper choice of ECL material and thickness, the switching field of FePt media can be substantially reduced while ensuring high thermal stability and a better signal-to-noise ratio, thus potentially paving the way for very high areal density media.
ISSN: 0003-6951
DOI: 10.1063/1.4996366
Rights: © 2017 American Institute of Physics (AIP). This paper was published in Applied Physics Letters and is made available as an electronic reprint (preprint) with permission of American Institute of Physics (AIP). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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