Title :
Time Dependence of Magnetic Anisotropy at Finite Temperature for Homogeneous and Composite Media
Author :
Huang, Pin-Wei ; Chen, Xi ; Victora, R.H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA
Abstract :
A simple torque-based method for calculating the transient behavior of temperature-dependent magnetic anisotropy is introduced. Using this method we obtain several physical quantities at finite temperature, including effective anisotropy, anisotropy field, and their fluctuations, that are crucial to heat-assisted magnetic recording (HAMR). We show that use of a composite grain that includes a high Curie temperature soft layer reduces the anisotropy fluctuations.
Keywords :
Curie temperature; composite materials; fluctuations; magnetic anisotropy; magnetic recording; soft magnetic materials; anisotropy field; composite grain media; effective anisotropy; fluctuations; heat-assisted magnetic recording; high-Curie temperature; homogeneous media; simple torque-based method; soft layer; temperature-dependent magnetic anisotropy; Anisotropic magnetoresistance; Heat-assisted magnetic recording; Jitter; Perpendicular magnetic anisotropy; Torque; Anisotropy; Landau-Liftshitz-Gilbert; composite media; heat-assisted magnetic recording;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2012.2196991
