Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets

J. Fischbacher, A. Kovacs, L. Exl, J. Kühnel, E. Mehofer, H. Sepehri-Amin, T. Ohkubo, K. Hono, T. Schrefl

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd2Fe14B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalScripta Materialia
Volume154
DOIs
Publication statusPublished - 2018 Sep
Externally publishedYes

Keywords

  • Grain boundary diffusion
  • Micromagnetism
  • Permanent magnet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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    Fischbacher, J., Kovacs, A., Exl, L., Kühnel, J., Mehofer, E., Sepehri-Amin, H., Ohkubo, T., Hono, K., & Schrefl, T. (2018). Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets. Scripta Materialia, 154, 253-258. https://doi.org/10.1016/j.scriptamat.2017.11.020