Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets
- Author(s)
- J Fischbacher, Alexander Kovacs, Lukas Exl, Julian Kühnel, Eduard Mehofer, Hossein Sepehri-Amin, T. Ohkubo, K. Hono, Thomas Schrefl
- 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 Nd
2Fe
14B 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.
- Organisation(s)
- Department of Mathematics, Physics of Functional Materials, Research Group Scientific Computing
- External organisation(s)
- University for Continuing Education Krems, Research and Services Division of Materials Data and Integrated System
- Journal
- Scripta Materialia
- Volume
- 154
- Pages
- 253-258
- No. of pages
- 6
- ISSN
- 1359-6462
- DOI
- https://doi.org/10.1016/j.scriptamat.2017.11.020
- Publication date
- 11-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Keywords
- ASJC Scopus subject areas
- Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Metals and Alloys, Materials Science(all)
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/searching-the-weakest-link-demagnetizing-fields-and-magnetization-reversal-in-permanent-magnets(e7e8bcdf-f156-4299-a0c2-7c095e9c9876).html