Die u:cris Detailansicht:
Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets
- Autor(en)
- J Fischbacher, Alexander Kovacs, Lukas Exl, Julian Kühnel, Eduard Mehofer, Hossein Sepehri-Amin, T. Ohkubo, K. Hono, Thomas Schrefl
- Abstrakt
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(en)
- Institut für Mathematik, Physik Funktioneller Materialien, Forschungsgruppe Scientific Computing
- Externe Organisation(en)
- Universität für Weiterbildung Krems, National Institute for Materials Science
- Journal
- Scripta Materialia
- Band
- 154
- Seiten
- 253-258
- Anzahl der Seiten
- 6
- ISSN
- 1359-6462
- DOI
- https://doi.org/10.1016/j.scriptamat.2017.11.020
- Publikationsdatum
- 11-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103018 Materialphysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Metals and Alloys, Allgemeine Materialwissenschaften
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/e7e8bcdf-f156-4299-a0c2-7c095e9c9876