Efficient spin current generation and suppression of magnetic damping due to fast spin ejection from nonmagnetic metal/indium-tin-oxide interfaces
Efficient spin current generation and suppression of magnetic damping due to fast spin ejection from nonmagnetic metal/indium-tin-oxide interfaces
复制标题
由于非磁性金属/氧化铟锡界面的快速自旋喷射，有效产生自旋电流并抑制磁阻尼
DOI：
10.1063/1.5050848
复制
发表时间：
2018
期刊：
影响因子：
6.1
通讯作者：
Y. Otani
中科院分区：
文献类型：
--
作者：
K. Kondou;Hanshen Tsai;H. Isshiki;Y. Otani
氧化铟锡(ITO)是一种透明电极材料，具有较小的自旋霍尔效应。然而，通过制备非磁性金属(NM：Cu或Ag)/ITO界面，我们通过阻尼调制和自旋泵浦测量，观察到了由于Edelstein效应而产生的有效的电荷-自旋相互转换。NM/ITO界面电荷-自旋转换的自旋电流电导率估计大于铂和β-Ta。此外，Ag/ITO界面的自旋-电荷转换系数λ为0.35 nm，与具有较大拉什巴自旋分裂的Ag/Bi界面相当。这些实验结果表明，在界面上实现有效的自旋-电荷相互转化并不需要像铋这样的重元素。结合互转换效应的实验结果，我们发现界面的自旋喷射时间与动量弛豫时间一样快。结果，我们不仅实现了高效的自旋电流产生，而且还抑制了接触的铁磁层中的磁阻尼力。这些发现将有助于我们理解界面电荷-自旋转换的物理机制，并为低功耗自旋电子器件的自旋电流发生器的材料研究提供一个新的视角。ITO是一种透明电极材料，具有很小的自旋霍尔效应。然而，通过制备非磁性金属(NM：Cu或Ag)/ITO界面，我们通过阻尼调制和自旋泵浦测量，观察到了由于Edelstein效应而产生的有效的电荷-自旋相互转换。NM/ITO界面电荷-自旋转换的自旋电流电导率估计大于铂和β-Ta。此外，Ag/ITO界面的自旋-电荷转换系数λ为0.35 nm，与具有较大拉什巴自旋分裂的Ag/Bi界面相当。这些实验结果表明，在界面上实现有效的自旋-电荷相互转化并不需要像铋这样的重元素。结合互转换效应的实验结果，我们发现界面的自旋喷射时间与动量弛豫时间一样快。因此，我们不仅实现了高效的自旋电流产生，而且还实现了自旋电流的持续增长。
Indium-tin-oxide (ITO), known as transparent electrode material, shows small spin Hall effect. However, by preparing the nonmagnetic metal (NM: Cu or Ag)/ITO interfaces, we observed an efficient charge-spin interconversion due to the Edelstein effect by means of damping modulation and spin pumping measurements. The estimated spin current conductivity for charge-to-spin conversion in NM/ITO interfaces is larger than Pt and β-Ta. Furthermore, the spin-to-charge conversion coefficient λ in Ag/ITO interfaces becomes 0.35 nm, which is comparable with that of the Ag/Bi interface with large Rashba spin splitting. These experimental results imply that a heavy element like Bi is not necessary to realize an efficient spin-charge interconversion at the interface. By the combination of the experimental results of the interconversion effect, we found that the spin ejection time from the interface is as fast as the momentum relaxation time. As a result, we realized not only efficient spin current generation but also suppression of magnetic damping in the contacted ferromagnetic layer. These findings will help us to understand the physics of interfacial charge-spin conversion and provide a new perspective to material research of spin current generator for low-consumption spintronics devices.Indium-tin-oxide (ITO), known as transparent electrode material, shows small spin Hall effect. However, by preparing the nonmagnetic metal (NM: Cu or Ag)/ITO interfaces, we observed an efficient charge-spin interconversion due to the Edelstein effect by means of damping modulation and spin pumping measurements. The estimated spin current conductivity for charge-to-spin conversion in NM/ITO interfaces is larger than Pt and β-Ta. Furthermore, the spin-to-charge conversion coefficient λ in Ag/ITO interfaces becomes 0.35 nm, which is comparable with that of the Ag/Bi interface with large Rashba spin splitting. These experimental results imply that a heavy element like Bi is not necessary to realize an efficient spin-charge interconversion at the interface. By the combination of the experimental results of the interconversion effect, we found that the spin ejection time from the interface is as fast as the momentum relaxation time. As a result, we realized not only efficient spin current generation but also su...
影响因子：
16.6
作者：
通讯作者：
--
影响因子：
41.2
作者：
Demidov, Vladislav E.;Urazhdin, Sergei;Demokritov, Sergej O.
通讯作者：
Demokritov, Sergej O.
影响因子：
44.1
作者：
Sinova, Jairo;Valenzuela, Sergio O.;Jungwirth, T.
通讯作者：
Jungwirth, T.