| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
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|
|---|---|---|
| Page(s) | C8-643 - C8-644 | |
| DOI | https://doi.org/10.1051/jphyscol:19888291 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-643-C8-644
DOI: 10.1051/jphyscol:19888291
1 Institut für Werkstoffe der Elektrotechnik, Aachen University of Technology, 5100 Aachen, Templergraben 55, F.R.G.
2 Natuurkundig Laboratorium Universiteit van Amsterdam Valckenierstraat 65, 1018 XE Amsterdam, the Netherlands
J. Phys. Colloques 49 (1988) C8-643-C8-644
DOI: 10.1051/jphyscol:19888291
MEASUREMENTS ON VERY SMALL SINGLE CRYSTALS OF NdFeB USING A VIBRATING REED MAGNETOMETER
H. J. Richter1, K. A. Hempel1 et R. Verhoef21 Institut für Werkstoffe der Elektrotechnik, Aachen University of Technology, 5100 Aachen, Templergraben 55, F.R.G.
2 Natuurkundig Laboratorium Universiteit van Amsterdam Valckenierstraat 65, 1018 XE Amsterdam, the Netherlands
Abstract
Nd2Fe14B single crystals with magnetic moments ranging from 1.6 x 10-8 Acm2 to 9.5 x 10-7 Acm2 are measured using the ultra high sensitivity vibrating reed magnetometer. The hysteresis loops are compared to those of BaFe12Ol9 single crystals. It turns out that the magnetization reversa1 of the Nd2Fe14B samples is similar to that of BaFe12O19 single crystals if the ferrite samples are considerably bigger in size. This does not hold for bigger Nd2Fe14B particles where stronger domain wall pinning is observed. For very small grains of Nd2Fe14B there is still evidence of domain wall processes while for BaFe12O19 grains of the same size true single domain behaviour can be observed.