Thermal activation in permanent magnets
Simon Bance, Johann Fischbacher, Alexander Kovacs, Harald Oezelt,, Franz Reichel, Thomas Schrefl
TL;DR
This paper investigates how thermal fluctuations influence the coercive field of permanent magnets, quantifying the reduction in coercivity due to temperature effects through micromagnetic simulations and validating with experimental data.
Contribution
It introduces a finite element micromagnetic simulation approach to quantify thermal activation effects on coercivity, extending understanding beyond temperature-dependent anisotropy.
Findings
Thermal fluctuations lower coercivity in permanent magnets.
Simulation results agree with experimental data.
Thermal activation contributes significantly to coercivity decay.
Abstract
The coercive field of permanent magnets decays with temperature. At non-zero temperature the system can overcome a finite energy barrier through thermal fluctuations. Using finite element micromagnetic simulations, we quantify this effect, which reduces coercivity in addition to the decrease of the coercive field associated with the temperature dependence of the anisotropy field, and validate the method through comparison with existing experimental data.
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