Thermally activated coercivity in core-shell permanent magnets.
- Resource Type
- Article
- Authors
- Bance, S.; Fischbacher, J.; Schrefl, T.
- Source
- Journal of Applied Physics. 2015, Vol. 117 Issue 17, p17A733-1-17A733-4. 4p. 1 Color Photograph, 1 Diagram, 3 Charts, 2 Graphs.
- Subject
- *PERMANENT magnets
*MAGNETIC materials
*MAGNETICS
*MAGNETISM
*TEMPERATURE
- Language
- ISSN
- 0021-8979
Finite element micromagnetic simulations are used to compute the temperature-dependent hysteresis properties of Nd2Fe14B permanent magnets in order to assess the influence of a hard (Dy,Nd)2Fe14B shell. The simulations show that the 4 nm thick shell cancels out the reduction in coercivity from an outer defect layer, which is known to exist at the grain boundaries in NdFeB permanent magnets. Activation volumes are computed and shown to depend on the structure's configuration as well as the temperature. [ABSTRACT FROM AUTHOR]