Details

Autor(en) / Beteiligte

• Bance, S.
• Seebacher, B.
• Schrefl, T.
• Exl, L.
• Winklhofer, M.
• Hrkac, G.
• Zimanyi, G.
• Shoji, T.
• Yano, M.
• Sakuma, N.
• Ito, M.
• Kato, A.
• Manabe, A.

Titel

Grain-size dependent demagnetizing factors in permanent magnets

Ist Teil von

• Journal of applied physics, 2014-12, Vol.116 (23)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2014

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• The coercive field of permanent magnets decreases with increasing grain size. The grain size dependence of coercivity is explained by a size dependent demagnetizing factor. In Dy free Nd2Fe14B magnets, the size dependent demagnetizing factor ranges from 0.2 for a grain size of 55 nm to 1.22 for a grain size of 8300 nm. The comparison of experimental data with micromagnetic simulations suggests that the grain size dependence of the coercive field in hard magnets is due to the non-uniform magnetostatic field in polyhedral grains.