Magnetic Anisotropy of KCoF_3 and KNiF_3

概要

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Magnetic anisotropy of single crystals KCoF_3 and KNiF_3was investigated the torque magneto-meter in the temperature range from 78° to 300°K. In the antiferromagnetic region, torque curves of these crystals when suspended along one of the cube edges can be expressed the formula T=C1H^2 sin 2θ-C_2H^4 sin 4θ, where H is the magnetic field intensity, θ the angle of rotation of H relative to one of the cubic axes, and C's are constants. In the case of KCoF_3 the 4θ-term was not observed, while in KNiF_3, the 4θ-term was rather dominant in all specimens when no external stress was applied. The amplitude of the 29-term is sensitive to the stress in both cases. The experimental results on KCoF_3 and KNiF_3 are well interpreted taking the antiferromagnetic spin axis to be parallel to the c-axis below their N6el temperatures. The origin of the 4θ-term which was observed in KNiF_3 is discussed, and it is concluded that this term arises from reversible movements of the antiferromagnetic domain walls existing in this compound.
社団法人日本物理学会の論文
1961-10-05