Bibliographic Details
| Title: |
Barkhausen jumps and magnetic viscosity in NdFeB magnets |
| Authors: |
LoBue, M. lobue@ien.it, Basso, V.1, Beatrice, G.1, Bertotti, C.1, Durin, G.1, Sasso, C.P.1 |
| Source: |
Journal of Magnetism & Magnetic Materials. Apr2005, Vol. 290-291, p1184-1187. 4p. |
| Subjects: |
Noise, Magnetization, Viscosity, Ferromagnetism |
| Abstract: |
Abstract: We present the analysis of Barkhausen noise measured on a Nd–Fe–B sintered sample during viscosity experiments at constant applied field H. The measured jump sizes give direct evidence that the dominant magnetization process is the reversal of a single or of a small group of grains. The Barkhausen noise average amplitude allows to evaluate the viscosity coefficient S and the related activation volume . We found nm which is comparable to the domain wall width, in agreement with previous interpretations. The Barkhausen jump sizes show a power-law distribution independent of the time elapsed from the beginning of the relaxation. This fact validates the interpretation of the observed relaxations as due to thermal activation over a distribution of energy barriers. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
