Magnetic Anisotropy of Au-Cr Alloys

概要

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Magnetic torque measurements in a (001) plane have been performed on the field-cooled single crystals of disordered Au-Cr alloys containing 4.4 to 23.5 at.%Cr. For the alloys with a long-range magnetic order, 15.7 to 23.5 at.%Cr, weak ferromagnetic torque with unidirectional anisotropy and rather strong antiferromagnetic torque with uniaxial anisotropy were simultaneously observed. The easy axis of the antiferromagnetic moments was along the cubic axis. The temperature dependence of the anisotropy of antiferromagnetic susceptibility ΔX displays a peak near the temperature at which the ferromagnetic moment M dissappears. For the alloys with a shortrange magnetic order, 4.4 to 12.1 at.%Cr, only a large ferromagnetic torque was observed. It was found that the abrupt increase in the amplitude of the ferromagnetic torque as the chromium concentration decreased came about because of a phase transition from magnetic long-range order to short-range order.
社団法人日本物理学会の論文
1972-03-05