Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface
Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface
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DOI：
10.1103/physrevb.99.134421
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发表时间：
2019-04-15
影响因子：
3.7
通讯作者：
Hayashi, Masamitsu
中科院分区：
文献类型：
--
作者：
Ishikuro, Yuto;Kawaguchi, Masashi;Hayashi, Masamitsu
研究了含Ir和Co界面的异质结的自旋矩效率和Dzyaloshinskii-Moriya相互作用，利用电流引起的反常Hall环的位移确定了[Pt/Co/X]多层膜（X = Ir，Cu）以及Ir/Co和Pt/Ir/Co参比膜的自旋矩效率和Dzyaloshinski-Moriya相互作用.我们发现有效自旋霍尔角和自旋扩散长度的Jr是类似于0.01和小于类似于1 nm，分别。短的自旋扩散长度和高导电性使Jr成为有效的自旋吸收层。这样的自旋下沉层可以用于控制异质结构中的自旋电流的流动并且在磁性层上引起足够的自旋轨道扭矩。发现Jr和Co界面的DMI在类似于1.4至类似于2.2 mJ/m（2）的范围内，与Pt和Co界面的量级相似。Ir/Co和Pt/Co界面具有相同的双折射符号，导致[Pt/Co/Ir]多层膜的双折射比[Pt/Co/Cu]多层膜的双折射降低。这些结果表明，Jr层在定义薄膜异质结构中的自旋轨道力矩和手征磁性方面发挥着独特的作用。
We studied the spin torque efficiency and the Dzyaloshinskii-Moriya interaction (DMI) of heterostructures that contain interface(s) of Jr and Co. The current-induced shifts of the anomalous Hall loops were used to determine the spin torque efficiency and DMI of [Pt/Co/X] multilayers (X = Jr, Cu) as well as Ir/Co and Pt/Ir/Co reference films. We find the effective spin Hall angle and the spin-diffusion length of Jr to be similar to 0.01 and less than similar to 1 nm, respectively. The short spin-diffusion length and the high conductivity make Jr an efficient spin sink layer. Such spin sink layer can be used to control the flow of spin current in heterostructures and to induce sufficient spin-orbit torque on the magnetic layer. The DMI of the Jr and Co interface is found to be in the range of similar to 1.4 to similar to 2.2 mJ/m(2), similar in magnitude to that of the Pt and Co interface. The Ir/Co and Pt/Co interfaces possess the same sign of DMI, resulting in a reduced DMI for the [Pt/Co/Ir] multilayers compared to that of the [Pt/Co/Cu] multilayers. These results show the unique role that the Jr layer plays in defining spin-orbit torque and chiral magnetism in thin-film heterostructures.