Interfacial Dzyaloshinskii-Moriya interaction, surface anisotropy energy, and spin pumping at spin orbit coupled Ir/Co interface
Interfacial Dzyaloshinskii-Moriya interaction, surface anisotropy energy, and spin pumping at spin orbit coupled Ir/Co interface
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DOI：
10.1063/1.4945685
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发表时间：
2016-04-04
影响因子：
4
通讯作者：
You, Chun-Yeol
中科院分区：
文献类型：
--
作者：
Kim, Nam-Hui;Jung, Jinyong;You, Chun-Yeol
通过布里渊光散射实验研究了Ir/Co界面的Dzyaloshinskiii-Moriya相互作用、表面各向异性能和自旋泵浦。与以前的报道相反，我们认为，在Ir/Co界面的iPhase的符号是相同的情况下的Pt/Co界面。我们还发现，尽管Ir具有很强的自旋轨道耦合（SOC），但Ir/Co体系的饱和磁化强度和垂直磁各向异性（PMA）能都得到了显著的提高，表明Ir/Co体系中的SOC对Ir/Co体系的饱和磁化强度和垂直磁各向异性（PMA）能有不同的影响.最后，我们确定了Ir/Co界面处的自旋泵浦效应，并且对于1.5 nm厚的Co，它将吉尔伯特阻尼常数从0.012增加到0.024。（C）2016 AIP Publishing LLC。
The interfacial Dzyaloshinskii-Moriya interaction (iDMI), surface anisotropy energy, and spin pumping at the Ir/Co interface are experimentally investigated by performing Brillouin light scattering. Contrary to previous reports, we suggest that the sign of the iDMI at the Ir/Co interface is the same as in the case of the Pt/Co interface. We also find that the magnitude of the iDMI energy density is relatively smaller than in the case of the Pt/Co interface, despite the large strong spin-orbit coupling (SOC) of Ir. The saturation magnetization and the perpendicular magnetic anisotropy (PMA) energy are significantly improved due to a strong SOC. Our findings suggest that an SOC in an Ir/Co system behaves in different ways for iDMI and PMA. Finally, we determine the spin pumping effect at the Ir/Co interface, and it increases the Gilbert damping constant from 0.012 to 0.024 for 1.5 nm-thick Co. (C) 2016 AIP Publishing LLC.