论文标题
通过旋转泵送在溅射的polycrystalline bi $ _x $ se $ _ {1-x} $中的旋转转换转换
Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi$_x$Se$_{1-x}$
论文作者
论文摘要
拓扑材料引起了人们的兴趣，因为有望根据有效的自旋轨道扭矩开关或旋转轨道磁性状态读出获得低功率和快速存储器设备。尤其是，溅射的多晶bi $ _x $ se $ _ {1-x} $是为此目的带来更大潜力的材料之一，因为它相对容易制造，并且据报道具有很高的自旋霍尔角。我们使用从连续的薄膜薄膜中的铁磁共振来研究BI $ _x $ se $ _ {1-x} $的旋转电荷转换。我们特别强调系统的界面特性。我们的结果表明，bi $ _x $ se $ _ {1-x} $的旋转厅角度与PT的符号相反。相比之下，由旋转转换产生的电荷电流低于PT。我们将其归因于bi $ _x $ se $ _ {1-x} $和Permalloy的扩散以及该效果产生的化学成分的变化，这是系统的内在特征，在许多其他研究中都不考虑。
Topological materials are of high interest due to the promise to obtain low power and fast memory devices based on efficient spin-orbit torque switching or spin-orbit magnetic state read-out. In particular, sputtered polycrystalline Bi$_x$Se$_{1-x}$ is one of the materials with more potential for this purpose since it is relatively easy to fabricate and has been reported to have a very high spin Hall angle. We study the spin-to-charge conversion in Bi$_x$Se$_{1-x}$ using the spin pumping technique coming from the ferromagnetic resonance in a contiguous permalloy thin film. We put a special emphasis on the interfacial properties of the system. Our results show that the spin Hall angle of Bi$_x$Se$_{1-x}$ has an opposite sign to the one of Pt. The charge current arising from the spin-to-charge conversion is, in contrast, lower than Pt by more than one order of magnitude. We ascribe this to the interdiffusion of Bi$_x$Se$_{1-x}$ and permalloy and the changes in chemical composition produced by this effect, which is an intrinsic characteristic of the system and is not considered in many other studies.
