Electronic Structure and Magnetic Properties of Mn-Substituted Fe-Pt

Jihoon Park, Yang Ki Hong, Chang Dong Yeo, Seong Gon Kim, David S. Kuo, Li Gao, Jan Ulrich Thiele

Research output: Contribution to journalArticle

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 Tc for Fe0.9375Mn0.0625Pt were calculated to be 942 eμcm3, 8.24 × 106J/m3 , 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 Ms and a K of 822 eμcm3 and 6.29 × 106 Jm3 at 300 K, respectively. These values meet the required Ms and K of 800 eμcm3 and 5.00 × 106Jm3 for achieving 4 Tb/in2 heat-assisted magnetic recording media (HAMR).

Original languageEnglish
Article number7372441
JournalIEEE Transactions on Magnetics
Volume52
Issue number7
DOIs
StatePublished - Jul 2016

Keywords

  • FePt
  • Magnetic properties
  • Mn substitution
  • first-principles calculation

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    Park, J., Hong, Y. K., Yeo, C. D., Kim, S. G., Kuo, D. S., Gao, L., & Thiele, J. U. (2016). Electronic Structure and Magnetic Properties of Mn-Substituted Fe-Pt. IEEE Transactions on Magnetics, 52(7), [7372441]. https://doi.org/10.1109/TMAG.2015.2511757