Weak ferromagnetism in NiCO3
1985; American Institute of Physics; Volume: 57; Issue: 8 Linguagem: Inglês
10.1063/1.335118
ISSN1520-8850
AutoresR. Plumier, M. Sougi, M. Lecomte, R. Saint‐James,
Tópico(s)Characterization and Applications of Magnetic Nanoparticles
ResumoMagnetization curves and neutron diffraction experiments performed at various temperatures on a powdered specimen of NiCO3 point out a Curie temperature TC =24.25 K. Down to 20 K, the spontaneous magnetization follows a (TC −T)1/2 relation. No good agreement exists between the observed and calculated dependencies of the magnetization on T and H on both sides of TC when the calculated values are obtained from an extension correct up to terms in H3 of Dzyaloshinsky’s theory of weak ferromagnetism. On the other hand, the relation m(T,H)= f(H)e−1/2(TC−T) is found to give excellent agreement with the experiments at T<TC and in a range ΔT/TC ≂20%.
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