Element-specific magnetization reversal in Fe/Ce multilayers:: a study by X-ray magnetic circular dichroism and the magneto-optic Kerr effect
Element-specific magnetization reversal in Fe/Ce multilayers:: a study by X-ray magnetic circular dichroism and the magneto-optic Kerr effect
复制标题
Fe/Ce 多层膜中元素特定磁化反转：X 射线磁圆二色性和磁光克尔效应的研究
DOI：
10.1016/s0304-8853(00)00513-8
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发表时间：
2000
影响因子：
2.7
通讯作者：
S. Pascarelli
中科院分区：
文献类型：
--
作者：
M. Münzenberg;M. Arend;W. Felsch;S. Pizzini;A. Fontaine;T. Neisius;S. Pascarelli
Fe/Ce多层膜是软磁的，有少量的矫顽场。在这个人工体系中，Ce的5d巡回电子通过与Fe的自旋分裂3d态杂化而被磁极化。为了深入了解磁化反转过程，利用X射线磁性圆二色谱的元素选择性测量了Ce-5d电子的磁化强度随外加磁场的变化。与磁光Kerr效应研究的磁化曲线相比，Ce-5d有序磁矩的磁滞回线中的矫顽力降低了50%。我们认为这是磁扰动界面上的效应，或者是最近的X射线共振磁散射实验探测到的Ce层复杂的非共线磁性结构的影响。并与Fe/La/Ce/La和Fe/CeH_2−δ多层膜的X射线二向色性和克尔磁滞回线进行了比较。这些系统的磁性更强，而且它们的矫顽力是相同的。
Fe/Ce multilayers are magnetically soft with coercive fields of a few Oersteds. In this artificial system, the itinerant 5d electrons of Ce are magnetically polarized by hybridization with the spin–split 3d states of Fe. To obtain an insight into the magnetization reversal process, the element selectivity of X-ray magnetic circular dichroism was used to measure the magnetization of the Ce-5d electrons as a function of an applied magnetic field. Comparison with the magnetization curves studied by the magneto-optic Kerr effect, which averages over the whole system, revealed that the coercivity in the hysteresis of the ordered Ce-5d moments is reduced by 50%. We propose that this is an effect of the magnetically disturbed interface or of the complex non-collinear magnetic structure of the Ce layers detected by recent experiments of X-ray resonant magnetic scattering. The results are compared to the X-ray dichroic and Kerr hysteresis loops of the multilayers Fe/La/Ce/La and Fe/CeH2−δ. These systems are magnetically harder and their coercivities are identical.