Title :
Damping criteria of magnetization in ferromagnetic ellipsoids
Author :
Sun, N.X. ; Wang, S.X.
Author_Institution :
Hitachi Global Storage Technol., San Jose, CA, USA
Abstract :
The critical damping constant of the magnetization of a uniformly magnetized ferromagnetic ellipsoid can be expressed by a simple formula based upon the small signal solution of the Landau-Lifshitz-Gilbert equation. It is predicted from the damping criteria that the damping condition of the magnetization in a uniformly magnetized ferromagnetic ellipsoid can be controlled by adjusting the damping constant, shape, anisotropy field, and/or external magnetic bias field, which is confirmed experimentally in thin-film geometry.
Keywords :
damping; ferromagnetic materials; magnetic anisotropy; magnetisation; Landau-Lifshitz-Gilbert equation; anisotropy field; critical damping constant; damping magnetization criterion; ferromagnetic resonance; magnetic bias field; magnetized ferromagnetic ellipsoid; soft magnetic films; thin-film geometry; Anisotropic magnetoresistance; Damping; Ellipsoids; Equations; Geometry; Magnetic anisotropy; Magnetic films; Magnetization; Perpendicular magnetic anisotropy; Shape control;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.821185
