Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816453
