1. Electronic Structure and Magnetic Properties of Mn-Substituted Fe–Pt.
- Author
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Park, Jihoon, Hong, Yang-Ki, Yeo, Chang-Dong, Kim, Seong-Gon, Kuo, David S., Gao, Li, and Thiele, Jan-Ulrich
- Subjects
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MAGNETIC properties of manganese compounds , *ELECTRONIC structure , *SUBSTITUTION reactions , *IRON compounds , *DENSITY functional theory , *MAGNETIC recorders & recording - Abstract
We have calculated the electronic structures of FePt and Fe0.9375Mn0.0625Pt using first principle calculations based on density functional theory within the local-spin-density approximation (LSDA). The Curie temperature ( Tc) was calculated by a simple model based on the mean field approximation. A supercell structure, containing eight unit cells, was used to calculate the density of states. The saturation magnetization ( Ms) and magnetocrystalline anisotropy constant ( K ) at 0 K, and T_{c} for Fe0.9375Mn0.0625Pt were calculated to be 942 emu/cm3, 8.24 \times 10^{6} J/ \textm^3 , and 590 K, respectively. The temperature-dependent M(T) and K(T) of Fe0.9375Mn0.0625Pt were calculated using the Brillouin function and Callen–Callen experimental relation, respectively, to obtain an M_{s} and a K of 822 emu/cm3 and 6.29 \times 10^6 J/ \textm^3 at 300 K, respectively. These values meet the required Ms and $K$ of 800 emu/cm3 and 5.00 \times 10^{6} J/ \text{m}^{3} for achieving 4 Tb/in2 heat-assisted magnetic recording media (HAMR). [ABSTRACT FROM PUBLISHER]
- Published
- 2016
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