Abstract
Micromagnetic simulations of magnetization reversals of Nd-Fe-B anisotropic magnets with exchange-coupled grains demonstrate that the local demagnetization factor decreases as the grain size is reduced. This explains the higher coercivity and the lower temperature dependence of coercivity in magnets with smaller grain sizes. When a fraction of Nd2Fe14B grains become a single domain state for average grain sizes <1 μm, a higher magnetic field is needed to magnetize them, giving rise to a two-step initial magnetization curve.
Original language | English |
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Pages (from-to) | 29-32 |
Number of pages | 4 |
Journal | Scripta Materialia |
Volume | 89 |
DOIs | |
Publication status | Published - 2014 Oct 15 |
Externally published | Yes |
Keywords
- Coercivity
- Demagnetization field
- Micromagnetic simulations
- Nd-Fe-B sintered magnets
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys