High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers

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 c...

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Main Authors: Dutta, Tanmay, Piramanayagam, S. N., Saifullah, M. S. M., Bhatia, C. S.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/84162
http://hdl.handle.net/10220/43567
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-841622023-02-28T19:42:33Z High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers Dutta, Tanmay Piramanayagam, S. N. Saifullah, M. S. M. Bhatia, C. S. School of Physical and Mathematical Sciences Magnetic devices Chemical compounds 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. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2017-08-07T09:03:31Z 2019-12-06T15:39:36Z 2017-08-07T09:03:31Z 2019-12-06T15:39:36Z 2017 Journal Article 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-. 0003-6951 https://hdl.handle.net/10356/84162 http://hdl.handle.net/10220/43567 10.1063/1.4996366 en Applied Physics Letters © 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: [http://dx.doi.org/10.1063/1.4996366]. 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. 5 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Magnetic devices
Chemical compounds
spellingShingle Magnetic devices
Chemical compounds
Dutta, Tanmay
Piramanayagam, S. N.
Saifullah, M. S. M.
Bhatia, C. S.
High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Dutta, Tanmay
Piramanayagam, S. N.
Saifullah, M. S. M.
Bhatia, C. S.
format Article
author Dutta, Tanmay
Piramanayagam, S. N.
Saifullah, M. S. M.
Bhatia, C. S.
author_sort Dutta, Tanmay
title High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
title_short High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
title_full High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
title_fullStr High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
title_full_unstemmed High switching efficiency in FePt exchange coupled composite media mediated by MgO exchange control layers
title_sort high switching efficiency in fept exchange coupled composite media mediated by mgo exchange control layers
publishDate 2017
url https://hdl.handle.net/10356/84162
http://hdl.handle.net/10220/43567
_version_ 1759854286643134464