Electric-field control of spin accumulation direction for spin-orbit torques
Electric-field control of spin accumulation direction for spin-orbit torques
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DOI：
10.1038/s41467-018-08274-8
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发表时间：
2019-01-16
影响因子：
16.6
通讯作者：
Yang, Hyunsoo
中科院分区：
文献类型：
--
作者：
Mishra, Rahul;Mahfouzi, Farzad;Yang, Hyunsoo
电场是一种高效节能的工具，可以用来控制自旋轨道转矩。虽然在不同的材料中，电场可以在一定程度上调节重金属/铁磁体异质结构中电流诱导的自旋积累量，但其方向的控制至今仍是难以捉摸的。在这里，我们报道了在氧化盖SOT器件中使用电场可以动态控制HM/FM界面上电流诱导自旋积累的方向和数量。外加电场传输氧离子并调节HM/FM界面化学，导致自旋霍尔和界面扭矩之间的相互作用，从而促进对sot方向和大小的非易失性和可逆控制。我们的电场控制自旋轨道电子学装置可以被编程为具有正自旋霍尔角或负自旋霍尔角的SOT系统。
Electric field is an energy-efficient tool that can be leveraged to control spin-orbit torques (SOTs). Although the amount of current-induced spin accumulation in a heavy metal (HM)/ferromagnet (FM) heterostructure can be regulated to a certain degree using an electric field in various materials, the control of its direction has remained elusive so far. Here, we report that both the direction and amount of current-induced spin accumulation at the HM/FM interface can be dynamically controlled using an electric field in an oxide capped SOT device. The applied electric field transports oxygen ions and modulates the HM/FM interfacial chemistry resulting in an interplay between the spin Hall and the interfacial torques which in turn facilitates a non-volatile and reversible control over the direction and magnitude of SOTs. Our electric-field controlled spin-orbitronics device can be programmed to behave either like the SOT systems with a positive spin Hall angle or a negative spin Hall angle.