Antiferromagnetic interlayer exchange coupling and large spin Hall effect in multilayer systems with Pt/Ir/Pt and Pt/Ir layers
Antiferromagnetic interlayer exchange coupling and large spin Hall effect in multilayer systems with Pt/Ir/Pt and Pt/Ir layers
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DOI：
10.1103/physrevb.104.064439
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发表时间：
2021-08
影响因子：
3.7
通讯作者：
Yoshiaki Saito;N. Tezuka;S. Ikeda;T. Endoh
中科院分区：
文献类型：
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作者：
Yoshiaki Saito;N. Tezuka;S. Ikeda;T. Endoh
我们研究了Pt/Ir/Pt和Pt/Ir多层膜作为合成反铁磁（AF）层非磁性间隔层的候选材料，为AF自旋电子学的系统研究提供了依据。在这些系统中，我们观察到(i)被Co层夹在Pt/Ir/Pt和Pt/Ir非磁性间隔层中的AF层间交换耦合，以及（ii） Pt/Ir多层重金属系统中的大自旋霍尔电导率，这是实现低功耗自旋轨道转矩切换所必需的。在Co/非磁性间隔层/Co与Pt/Ir/Pt和Pt/Ir非磁性间隔层中，AF层间交换耦合的总厚度[ttotal=tPt(Ptthickness)+tIr(Irthickness)]范围较宽。此外，还观察到Pt/Ir多层重金属的自旋霍尔角大，电阻率低。这些结果表明，Pt/Ir/Pt和Pt/Ir为非磁性间隔层，使我们能够在合成AF耦合层体系中实现AF层间交换耦合，并通过自旋霍尔效应产生大的自旋轨道转矩。
We investigated Pt/Ir/Pt and Pt/Ir multilayers as candidates of nonmagnetic spacer layers in synthetic antiferromagnetic (AF) layers, which are available for the systematic study on AF spintronics. In these systems, we observed (i) AF interlayer exchange coupling in Pt/Ir/Pt and Pt/Ir nonmagnetic spacer layers sandwiched by Co layers and (ii) large spin Hall conductivity in Pt/Ir multilayer heavy-metal systems which is essential to achieve low power consumption spin-orbit torque switching. We found that total nonmagnetic spacer layer thickness [ttotal=tPt(Ptthickness)+tIr(Irthickness)] range in which AF interlayer exchange coupling is observed is wide in Co/nonmagnetic spacer layer/Co with Pt/Ir/Pt and Pt/Ir nonmagnetic spacer layers. Moreover, the large spin Hall angle ofand low resistivity ofin Pt/Ir multilayer heavy metal are observed. These results indicate that Pt/Ir/Pt and Pt/Ir are nonmagnetic spacer layers allowing us to achieve the AF interlayer exchange coupling and generation of large spin-orbit torque via spin Hall effect in synthetic AF coupling layer system.