期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 677, 期 -, 页码 139-142出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.03.160
关键词
Coercivity; Nd-Fe-B; Permanent magnets; Small-angle neutron scattering
资金
- National Research Fund of Luxembourg [INTER/DFG/12/07]
- University of Luxembourg (INTERFACE project)
Isotropic Nd-Fe-B-based sintered magnets, before and after a (Tb-doped) grain-boundary diffusion process, have been investigated by means of magnetic-field-dependent small-angle neutron scattering. Compared to the untreated sample, we found a reduced correlation length in the grain boundary diffused sample which, in an applied-field range of 8.5 T, varies between 30 and 35 nm - about 15% smaller than in the untreated specimen. This observation is related to the increased magnetic anisotropy field of the nucleation sites for magnetization reversal, and may be explained by a reduction in the effective defect size responsible for the magnetic inhomogeneities. (C) 2016 Elsevier B.V. All rights reserved.
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