Title :
Effect of thermal fluctuation on reversal field of magnetic fine particle with surface anisotropy
Author :
Nakatani, Y. ; Hayashi, N. ; Uesaka, Y. ; Fukushima, H. ; Kitakami, O. ; Shimada, Y.
Author_Institution :
Univ. of Electro-Commun., Tokyo, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
The magnetization reversal of a nanometer size ferromagnetic particle with surface anisotropy is investigated by micromagnetic computer simulation. Two kinds of calculations were performed: calculations with and without thermal fluctuation. In the case without thermal fluctuation a surface anisotropy of several ergs/cm2 was found to increase the magnetization reversal field of the particle by a factor of ten as compared with the case without surface anisotropy. The introduction of surface anisotropy was also found to increase the reversal field, and hence, improve thermal stability
Keywords :
magnetic anisotropy; magnetic particles; magnetic recording noise; magnetisation reversal; magnetic fine particle; magnetisation reversal field; micromagnetic computer simulation; nanometer size ferromagnetic particle; surface anisotropy; thermal fluctuation; Anisotropic magnetoresistance; Computer simulation; Fluctuations; Magnetic anisotropy; Magnetic particles; Magnetic recording; Magnetization reversal; Micromagnetics; Perpendicular magnetic anisotropy; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
