Muduli P K, Rice W C, He L, Collins B A, Chu Y S, Tsui F
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599, USA.
J Phys Condens Matter. 2009 Jul 22;21(29):296005. doi: 10.1088/0953-8984/21/29/296005. Epub 2009 Jul 3.
Magnetic anisotropy, magnetization reversal and the magnetooptic Kerr effect in Co(x)Mn(y)Ge(z) have been studied over a range of compositions between 0 and 50 at.% of Ge and between 1 and 3 in the Co to Mn atomic ratio, including the Heusler alloy Co(2)MnGe. A strong quadratic magnetooptic Kerr effect has been observed within a narrow region of composition centered around the Co to Mn atomic ratio of 2, which has been used to probe and quantify the magnetic anisotropy and magnetization reversal of the system. The anisotropy is sixfold with a weak uniaxial component, and it exhibits sensitive dependence on composition, especially on the atomic ratio between Co and Mn. The magnetization reversal process is consistent with the single-domain Stoner-Wohlfarth model.
在钴（x）锰（y）锗（z）中，研究了锗含量在0至50原子百分比之间，钴与锰原子比在1至3之间的一系列成分下的磁各向异性、磁化反转和磁光克尔效应，其中包括赫斯勒合金Co₂MnGe。在钴与锰原子比约为2的狭窄成分区域内观察到了强烈的二次磁光克尔效应，该效应已被用于探测和量化该体系的磁各向异性和磁化反转。各向异性为六重，具有较弱的单轴分量，并且对成分表现出敏感依赖性，特别是对钴和锰之间的原子比。磁化反转过程与单畴斯托纳 - 沃尔法特模型一致。
