Title :
Thermal reversal of elongated ferromagnetic particles misoriented to the applied field
Author :
Goll, Dagmar ; Bertram, H. Neal
fDate :
7/1/2004 12:00:00 AM
Abstract :
The energy barrier to be overcome for thermal reversal, the reversal mode and the effective particle volume involved are determined by the saddle points of the energy surface. We investigate the influence of field misorientation, exchange-coupling and magnetostatic interaction for a 2:1 aspect ratio particle discretized into two subunits. Typically, increasing the field angle from 0° to 45° enhances the effective volume in both cases by more than 20%.
Keywords :
diffusion barriers; exchange interactions (electron); ferromagnetic materials; magnetic particles; magnetisation reversal; magnetostatics; effective particle volume; elongated ferromagnetic particles; energy barrier; energy surface; exchange-coupling effect; field angle; field misorientation; magnetostatic interaction; reversal mode; thermal reversal; Anisotropic magnetoresistance; Crystallization; Energy barrier; Magnetic anisotropy; Magnetic recording; Magnetization reversal; Magnetostatics; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature distribution; Elongated ferromagnetic particles; field misorientation; thermal reversal;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.830623
