Huge quadratic magneto-optical Kerr effect and magnetization reversal in the Co2FeSi Heusler compound
Huge quadratic magneto-optical Kerr effect and magnetization reversal in the Co2FeSi Heusler compound
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DOI：
10.1088/0022-3727/40/6/s09
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发表时间：
2007-03-21
影响因子：
3.4
通讯作者：
Felser, C.
中科院分区：
文献类型：
--
作者：
Hamrle, J.;Blomeier, S.;Felser, C.
利用纵向和二次(QMOKE)磁光克尔效应研究了在MgO(100)衬底上生长的L2(1)结构的Co2FeSi(100)薄膜。这些薄膜表现出一个巨大的QMOKE信号，最大贡献高达30mdeg，这是迄今为止测量到的最大反射QMOKE信号。这个大数值是一个非常大的二阶或更高阶的自旋-轨道耦合的指纹。当薄膜厚度分别为22 nm和98 nm时，Co2FeSi(1 0 0)薄膜具有较大的矫直力，分别为35 0Oe和70Oe。尽管薄膜是外延的，但它们不提供分别超过1%和2%的各向异性和剩磁的角度依赖关系。
Co2FeSi( 1 0 0) films with L2(1) structure deposited onto MgO( 1 0 0) were studied using both the longitudinal and quadratic ( QMOKE) magneto-optical Kerr effect. The films exhibit a huge QMOKE signal with a maximum contribution of up to 30 mdeg, which is the largest QMOKE signal in reflection that has been measured thus far. This large value is a fingerprint of an exceptionally large spin - orbit coupling of second or higher order. The Co2FeSi( 1 0 0) films exhibit a rather large coercivity of 350 Oe and 70 Oe for film thicknesses of 22 nm and 98 nm, respectively. Despite the fact that the films are epitaxial, they do not provide an angular dependence of the anisotropy and the remanence in excess of 1% and 2%, respectively.