Magnetic Anisotropy of KCoF<SUB>3</SUB> and KNiF<SUB>3</SUB>

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公開日
1961
DOI
  • 10.1143/jpsj.16.1934
公開者
一般社団法人 日本物理学会

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説明

Magnetic anisotropy of single crystals KCoF3 and KNiF3 was investigated by 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 by the formula<BR>T=C1H2sin2θ−C2H4sin4θ,<BR>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 KCoF3 the 4θ-term was not observed, while in KNiF3 the 4θ-term was rather dominant in all specimens when no external stress was applied. The amplitude of the 2θ-term is sensitive to the stress in both cases. The experimental results on KCoF3 and KNiF3 are well interpreted by taking the antiferromagnetic spin axis to be parallel to the c-axis below their Néel temperatures. The origin of the 4θ-term which was observed in KNiF3 is discussed, and it is concluded that this term arises from reversible movements of the antiferromagnetic domain walls existing in this compound.

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