Analytic expression for magnetic activation energy

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1 Citation (Scopus)


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.

Original languageEnglish
Article number058002
JournalJapanese journal of applied physics
Issue number5
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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