Determination of spin pumping effect in {CoFeB}/{Ir} bilayer
Determination of spin pumping effect in {CoFeB}/{Ir} bilayer
复制标题
{CoFeB}/{Ir}双层中自旋泵浦效应的测定
DOI：
10.1016/j.jmmm.2019.165971
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发表时间：
2020
影响因子：
2.7
通讯作者：
He Wei
中科院分区：
文献类型：
--
作者：
Sun Rui;Li Yan;Xie Z.K.;Li Yang;Zhao Xiao-Tian;Liu Wei;Zhang Z.D.;Zhu T.;Cheng Zhao-Hua;He Wei
利用宽带铁磁共振测量技术研究了CoFeB/Ir双层膜的自旋抽运效应。随着重金属Ir层厚度的增加，8 nm CoFeB薄膜的吉尔伯特阻尼因子从7 × 10− 3增加到1.1 × 10−2，自旋泵效应引起的附加阻尼因子很快达到饱和值.根据自旋抽运理论，得到了CoFeB/Ir的自旋混合电导和Ir的自旋扩散长度。自旋混合电导为2.14 × 1019 m −2。此外，自旋扩散长度仅为1.34 nm，与重金属Pt相比相当短。我们的研究结果揭示了重金属Ir中存在强的自旋轨道耦合，这可能是一种潜在的自旋电子器件材料。
The spin pumping effect of CoFeB/Ir bilayers has been investigated via the broadband ferromagnetic resonance measurement. With increasing the thickness of heavy metal Ir layer, the Gilbert damping factor of 8 nm CoFeB film increases from 7 × 10−3to 1.1 × 10−2, and the additional damping factors induced by the spin pumping effect quickly reaches its saturation value. According to the spin pumping theory, the spin mixing conductance of CoFeB/Ir and the spin diffusion length of Ir were obtained. The spin mixing conductance is 2.14 × 1019m−2. Furtherly, the spin diffusion length is only 1.34 nm, which is quite shorter compared with the heavy metal Pt. Our results reveal the existence of the strong spin-orbit coupling in the heavy metal Ir, which can be a potential material for the application in spintronic devices.