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arXiv 1706.07559cond-mat.mtrl-sci
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X射线磁圆二色性测定Pt在Y-$_3$ Fe-PDMATHAAB O-$_{12}$上的诱导顺磁矩

Detection of induced paramagnetic moments in Pt on Y$_3$Fe$_5$O$_{12}$ via x-ray magnetic circular dichroism

Takashi Kikkawa, Motohiro Suzuki, Jun Okabayashi, Ken-ichi Uchida, Daisuke Kikuchi, Zhiyong Qiu, Eiji Saitoh

摘要:

用X射线磁圆二色性(XMCD)研究了低温高磁场下铁磁绝缘体$_3$ Fe $_5$ O $_{12}$(YIG)上超薄Pt膜的磁矩.我们观察到一个XMCD信号,由于在Pt $L_{3}$ -和$L_{2}$ -边缘的Pt膜的磁矩。通过元素特异性磁测量,我们发现即使当磁场远大于YIG的饱和磁场时,Pt $L_{3}$ -边缘处的XMCD信号也随着磁场的增加而逐渐增加。重要的是,所观察到的XMCD强度被发现是远远大于预期的强度从泡利顺磁性的Pt时,Pt膜连接到YIG。这些结果暗示了YIG上Pt中感生顺磁矩的出现,并解释了Pt/YIG系统中非常规霍尔效应的特征。

英文摘要:

Magnetic moments in an ultra-thin Pt film on a ferrimagnetic insulator Y$_3$Fe$_5$O$_{12}$ (YIG) have been investigated at high magnetic fields and low temperatures by means of X-ray magnetic circular dichroism (XMCD). We observed an XMCD signal due to the magnetic moments in a Pt film at the Pt $L_{3}$- and $L_{2}$-edges. By means of the element-specific magnetometry, we found that the XMCD signal at the Pt $L_{3}$-edge gradually increases with increasing the magnetic field even when the field is much greater than the saturation field of YIG. Importantly, the observed XMCD intensity was found to be much greater than the intensity expected from the Pauli paramagnetism of Pt when the Pt film is attached to YIG. These results imply the emergence of induced paramagnetic moments in Pt on YIG and explain the characteristics of the unconventional Hall effect in Pt/YIG systems.

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