We calculate the electronic structures of FePt and Fe0.5Mn0.5Pt using first-principles calculations based on density functional theory within the local-spin-density approximation. The Curie temperature (Tc) was calculated by mean field approximation. Composition dependence of the Cure temperature (Tc(x)) of Fe1−xMnxPt was used to identify a composition to meet the desired Tc in the range of 600–650 K. The identified composition (0.0294 ≤ x ≤ 0.0713) gives saturation magnetization (Ms) in the range of 1041–919 emu/cm3 and magnetocrystalline anisotropy constant (K) in the range of 9.96–8.36 × 106 J/m3 at 0 K. Temperature dependent M(T) and K(T) of Fe1−xMnxPt (0.0294 ≤ x ≤ 0.0713) were calculated using the Brillouin function and Callen-Callen experimental relation, respectively. Fe1−xMnxPt (0.0294 ≤ x ≤ 0.0713) shows 930–800 emu/cm3 of Ms and 7.18–5.61 × 106 J/m3 of K at 300 K, thereby satisfying desired magnetic properties for heat-assisted magnetic recording media to achieve 4 Tb/in.2 areal density.
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7 February 2015
Research Article|
February 05 2015
Magnetic properties of Fe-Mn-Pt for heat assisted magnetic recording applications
Jihoon Park;
Jihoon Park
1Department of Electrical and Computer Engineering and MINT Center,
The University of Alabama
, Tuscaloosa, Alabama 35487, USA
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Yang-Ki Hong;
Yang-Ki Hong
a)
1Department of Electrical and Computer Engineering and MINT Center,
The University of Alabama
, Tuscaloosa, Alabama 35487, USA
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Seong-Gon Kim;
Seong-Gon Kim
2Department of Physics & Astronomy and Center for Computational Sciences,
Mississippi State University
, Mississippi State, Mississippi 39792, USA
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Li Gao;
Li Gao
3
Seagate Technology LLC
, 47050 Kato Road, Fremont, California 94538, USA
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Jan-Ulrich Thiele
Jan-Ulrich Thiele
3
Seagate Technology LLC
, 47050 Kato Road, Fremont, California 94538, USA
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a)
E-mail: ykhong@eng.ua.edu
J. Appl. Phys. 117, 053911 (2015)
Article history
Received:
November 23 2014
Accepted:
January 26 2015
Citation
Jihoon Park, Yang-Ki Hong, Seong-Gon Kim, Li Gao, Jan-Ulrich Thiele; Magnetic properties of Fe-Mn-Pt for heat assisted magnetic recording applications. J. Appl. Phys. 7 February 2015; 117 (5): 053911. https://doi.org/10.1063/1.4907570
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