Current-Induced Spin Torques on Single GdFeCo Magnetic Layers
Current-Induced Spin Torques on Single GdFeCo Magnetic Layers
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DOI：
10.1002/adma.202007047
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发表时间：
2021-02-19
影响因子：
29.4
通讯作者：
Rojas-Sanchez, Juan-Carlos
中科院分区：
文献类型：
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作者：
Cespedes-Berrocal, David;Damas, Heloise;Rojas-Sanchez, Juan-Carlos
自旋电子学利用自旋轨道耦合（SOC）来产生自旋电流，自旋力矩，以及在缺乏反转对称性的情况下，Rashba和Dzyaloshinskiii-Moriya相互作用。基于3d金属（如Fe和Co）的广泛使用的磁性材料具有小的SOC。为了克服这个缺点，通常的做法是利用5d重金属（HMs）（如Pt）的叠层的大SOC来产生自旋电流，并进而在磁性层上施加自旋扭矩。在这里，引入了一类新的材料架构，不包括高性能自旋电子学操作的5D HM。非常强的电流感应扭矩施加在单一的亚铁磁GdFeCo层，由于大SOC的Gd 5d状态和反转对称性破缺主要由接口工程的组合，证明。这些“自转矩”增强周围的磁化补偿温度，可以通过调整GdFeCo层外的自旋吸收进行调谐。在其他测量中，从GdFeCo的非常大的自旋电流的发射，80%（20%）的自旋反常霍尔效应（自旋霍尔效应）对称性被确定。这种材料平台开辟了在单个磁性层上施加“自转矩”以及从磁性层产生自旋电流的新视角。
Spintronics exploit spin-orbit coupling (SOC) to generate spin currents, spin torques, and, in the absence of inversion symmetry, Rashba and Dzyaloshinskii-Moriya interactions. The widely used magnetic materials, based on 3d metals such as Fe and Co, possess a small SOC. To circumvent this shortcoming, the common practice has been to utilize the large SOC of nonmagnetic layers of 5d heavy metals (HMs), such as Pt, to generate spin currents and, in turn, exert spin torques on the magnetic layers. Here, a new class of material architectures is introduced, excluding nonmagnetic 5d HMs, for high-performance spintronics operations. Very strong current-induced torques exerted on single ferrimagnetic GdFeCo layers, due to the combination of large SOC of the Gd 5d states and inversion symmetry breaking mainly engineered by interfaces, are demonstrated. These "self-torques" are enhanced around the magnetization compensation temperature and can be tuned by adjusting the spin absorption outside the GdFeCo layer. In other measurements, the very large emission of spin current from GdFeCo, 80% (20%) of spin anomalous Hall effect (spin Hall effect) symmetry is determined. This material platform opens new perspectives to exert "self-torques" on single magnetic layers as well as to generate spin currents from a magnetic layer.