Geometrical analysis of precessional switching and relaxation in uniformly magnetized bodies

Author

Bertotti, Giorgio ; Mayergoyz, Isaak D. ; Serpico, Claudio ; D´Aquino, Massimiliano

Author_Institution

Inst. Elettrotecnico Nazionale, Torino, Italy

Volume

39

Issue

5

fYear

2003

Firstpage

2501

Lastpage

2503

Abstract

Precessional switching and relaxation in a single-domain particle or film is studied by using the Landau-Lifshitz-Gilbert equation. The analysis of the switching process is based on the explicit knowledge of two integrals of motion for the magnetization dynamics in the conservative case. The knowledge of these integrals of motions enables one to carry out the geometrical analysis of the system and give the complete phase portrait. The relaxation process which occurs after the magnetization is reversed is analyzed by using geometrical methods and it is showed that the dynamical system exhibits entanglement of separatrices and riddled basins of attraction.

Keywords

magnetic particles; magnetic relaxation; magnetic switching; magnetic thin films; magnetisation reversal; spin dynamics; Landau-Lifshitz-Gilbert equation; dynamical system; entanglement; film; geometrical analysis; integrals of motion; magnetization dynamics; phase portrait; precessional switching; relaxation; riddled basins of attraction; separatrices; single-domain particle; uniformly magnetized bodies; Anisotropic magnetoresistance; Integral equations; Magnetic analysis; Magnetic anisotropy; Magnetic films; Magnetic separation; Magnetic switching; Motion analysis; Perpendicular magnetic anisotropy; Saturation magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.816453

Filename

1233123