Field-Dependent Prefactor of the Thermal Relaxation Rate in Single-Domain Magnetic Particles
Journal
Physical Review B
Journal Volume
48
Journal Issue
21
Pages
15823-15828
Date Issued
1993
Author(s)
Abstract
Within a model of the coherent rotation, we assume underdamped dynamics of magnetization in single-domain ferromagnetic particles and calculate the prefactor f0(h) of the thermal decay rate as a function of the applied field h. Four different models of dissipative coupling are considered. As opposed to the previously reported temperature dependence of the prefactor, the field dependence is remarkably independent of the chosen coupling mode. The prefactor f0(h) drops off sharply as h approaches the nucleation field and significantly enhances the coercivity whose model calculation, together with that of the switching-field distribution, is carried out. © 1993 The American Physical Society.
SDGs
Type
journal article