TY - JOUR
T1 - Analytic expression for magnetic activation energy
AU - Miura, Daisuke
AU - Sakuma, Akimasa
N1 - Publisher Copyright:
© 2019 The Japan Society of Applied Physics.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - We theoretically investigate the magnetic activation energy of permanent magnets. Practically, it is widely used in a phenomenological form as where is the activation energy in the absence of an external magnetic field is a real parameter, and is defined by the equation . We derive the general and direct expressions for these phenomenological parameters under the restriction of uniform rotation of magnetization and on the basis of the perturbative theory with respect to . Further, we apply our results to Nd2Fe14B magnets and confirm the validity of the proposed method by comparing with the Monte Carlo calculations.
AB - We theoretically investigate the magnetic activation energy of permanent magnets. Practically, it is widely used in a phenomenological form as where is the activation energy in the absence of an external magnetic field is a real parameter, and is defined by the equation . We derive the general and direct expressions for these phenomenological parameters under the restriction of uniform rotation of magnetization and on the basis of the perturbative theory with respect to . Further, we apply our results to Nd2Fe14B magnets and confirm the validity of the proposed method by comparing with the Monte Carlo calculations.
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U2 - 10.7567/1347-4065/aaffed
DO - 10.7567/1347-4065/aaffed
M3 - Article
AN - SCOPUS:85067791578
VL - 58
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 5
M1 - 058002
ER -