Thermally activated coercivity in core-shell permanent magnets

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 ou...

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Bibliographic Details
Published in:Journal of applied physics 2015-05, Vol.117 (17)
Main Authors: Bance, S., Fischbacher, J., Schrefl, T.
Format: Article
Language:English
Subjects:
Coercivity
Computer simulation
Finite element method
Grain boundaries
Magnetic properties
Magnetism
Permanent magnets
Temperature dependence
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4916542