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

Volume

28

Issue

2

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

986

Lastpage

989

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.123848

Filename

123848