Selinsky Rachel S, Keavney David J, Bierman Matthew J, Jin Song
Appl Phys Lett. 2009 Nov 16;95(20):202501. doi: 10.1063/1.3251777.
A soft x-ray absorption and x-ray magnetic circular dichroism (XMCD) study of the ferromagnetism in solution-grown EuS nanocrystals (NCs) is reported. The absorption edges of Eu M(5) and M(4), S K, O K, and P K were probed to determine elementally specific contributions to the magnetism of EuS NCs. Differential spin absorption was observed by XMCD at the Eu M(5,4) edges confirming the presence of a magnetic moment on the Eu(2+) 4f shell. No dichroic signal was observed for S, O, or P. Vibrating sample magnetometry of ensembles of NCs shows ferromagnetic properties consistent with the XMCD studies.
报道了对溶液生长的硫化铕纳米晶体（NCs）中铁磁性的软X射线吸收和X射线磁圆二色性（XMCD）研究。探测了Eu M(5)和M(4)、S K、O K和P K的吸收边，以确定对EuS NCs磁性的元素特异性贡献。通过XMCD在Eu M(5,4)边观察到了自旋吸收差异，证实了Eu(2+) 4f壳层上存在磁矩。未观察到S、O或P的二色性信号。NCs集合体的振动样品磁强计显示出与XMCD研究一致的铁磁性质。
