Title :
Angular variation of coercivity in thin-film media by micromagnetic model
Author :
Lu, Pu-Ling ; Charap, Stanley H.
Author_Institution :
Dept. of Electr. & Comput. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA
fDate :
3/1/1992 12:00:00 AM
Abstract :
A computer micromagnetic simulation model is employed to study the angular variation of coercivity (out of plane) in thin-film media. Each grain of the film is uniformly magnetized and switches coherently according to the S-W model. The M-H hysteresis loops for applied fields at different angles to the film plane are obtained for various magnetostatic interaction parameters, quantum exchange constants, and easy axis distributions. The angular variation of the coercivity curve exhibits a peak if there is magnetostatic interaction among the grains and qualitatively follows the experimental results well. The peak in the angular variation of coercivity is seen to result from the demagnetizing field. The rotational hysteresis process is also investigated by means of this model
Keywords :
coercive force; digital simulation; magnetic hysteresis; magnetic recording; magnetic thin films; magnetisation; physics computing; CoCr films; M-H hysteresis loops; S-W model; coercivity angular variation; computer micromagnetic simulation model; demagnetizing field; magnetostatic interaction parameters; quantum exchange constants; recording media; rotational hysteresis process; thin-film media; Coercive force; Computational modeling; Computer simulation; Demagnetization; Hysteresis; Magnetic switching; Magnetostatics; Micromagnetics; Switches; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
