Temperature variation of domain structure and magnetization in NdFeB magnets
1987; American Institute of Physics; Volume: 61; Issue: 8 Linguagem: Inglês
10.1063/1.338748
ISSN1520-8850
Autores Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoThe domain structure of cast NdFeB magnets has been observed using the Kerr effect, both at room temperature and at temperatures up to the Curie point. The domain structure is typical of strongly uniaxial materials, and no substantial changes in domain size or domain structure are found up to the Curie point. The value of the Curie point has been determined from differential scanning calorimeter measurements over a range of heating and cooling rates, and also from a direct measurement of magnetization at 10 kOe versus temperature. The former method gives an extrapolated value of TC =307.5 °C, and the latter method gives TC =321 °C. The difference is attributed to the fact that one measurement is made at zero field and the other at 10 kOe.
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