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Advances in Materials Science and Engineering
Volume 2015, Article ID 504628, 5 pages
http://dx.doi.org/10.1155/2015/504628
Research Article

Design and Micromagnetic Simulation of Fe/L10-FePt/Fe Trilayer for Exchange Coupled Composite Bit Patterned Media at Ultrahigh Areal Density

1Magnetic Materials & Data Storage Research Laboratory, Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Thailand
2KKU-Seagate Cooperation & EMC/EMI Research Laboratory, Department of Electrical Engineering, Faculty of Engineering, Khon Kaen University, Thailand

Received 16 December 2014; Accepted 13 January 2015

Academic Editor: Pavel Lejcek

Copyright © 2015 Warunee Tipcharoen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Exchange coupled composite bit patterned media (ECC-BPM) are one candidate to solve the trilemma issues, overcome superparamagnetic limitations, and obtain ultrahigh areal density. In this work, the ECC continuous media and ECC-BPM of Fe/L10-FePt/Fe trilayer schemes are proposed and investigated based on the Landau-Lifshitz-Gilbert equation. The switching field, , of the hard phase in the proposed continuous ECC trilayer media structure is reduced below the maximum write head field at interlayer exchange coupling between hard and soft phases, , higher than 20 pJ/m and its value is lower than that for continuous L10-FePt single layer media and L10-FePt/Fe bilayer. Furthermore, the of the proposed ECC-BPM is lower than the maximum write head field with exchange coupling coefficient between neighboring dots of 5 pJ/m and over 10 pJ/m. Therefore, the proposed ECC-BPM trilayer has the highest potential and is suitable for ultrahigh areal density magnetic recording technology at ultrahigh areal density. The results of this work may be gainful idea for nanopatterning in magnetic media nanotechnology.