Magnetic Anisotropy Measurement of MnO Single Crystal

概要

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The magnetic anisotropy of MnO single crystal, grown by the Verneuil method, was measured using a torque balance. The results of the torque measurements at liquid air temperature could be summarized within experimental errors by a formula T = C_1H^2sin(2θ + ε_1) + C_2H^4sin(4θ + ε_2) + C_3H^6, where H is the applied field intensity, θ the angle of rotation of H relative to the crystal, and ε's and C's are constants which depend in a certain way on the kind of crystallographic axis of suspension. In the case where [111] is the direction of suspension, C_2 = 0. The C_3H^0 term changed its sigh when the rotation was made in the revere sense; thus it represents a rotational hysteresis term. Alternative theoretical interpretations of the new 4θ-term are presented: it arises either from a possible small anisotropy energy within the easy plane of magnetization, or from reversible movements of the walls which separate different antiferromagnetic domains. Discussion to favor the latter is given.
社団法人日本物理学会の論文
1960-03-05