Li Yan, Zheng Dongxing, Liu Chen, Zhang Chenhui, Fang Bin, Chen Aitian, Ma Yinchang, Manchon Aurélien, Zhang Xixiang
Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Aix-Marseille Université, CNRS, CINaM, Marseille 13288, France.
ACS Nano. 2022 May 24;16(5):8181-8189. doi: 10.1021/acsnano.2c01788. Epub 2022 May 13.
Insulating compensated ferrimagnets, especially hosting room-temperature compensation points, are considered promising candidates for developing ultra-high-density and ultrafast magnonic devices owing to combining the characteristics of both ferromagnets and antiferromagnets. These intriguing features become outstanding close to their compensation points. However, their spin-orbit torque (SOT)-induced magnetization switching, particularly in the vicinity of the compensation points, remains unclear. Herein, we systematically investigated the SOT in insulating compensated ferrimagnetic GdFeO/Pt heterostructures with perpendicular magnetic anisotropy. A nearly room-temperature compensation point ( ∼ 297 K) was consistently identified by the magnetization curves, spin Hall-induced anomalous Hall effect, and spin Hall magnetoresistance measurements. Moreover, using 100 ns duration pulsed current, deterministic current-induced magnetization switching below and above , even at 294 and 301 K, was achieved with opposite switching polarity. It is found that a large current is required to switch the magnetization in the vicinity of , although the effective SOT field increases close to . Our finding provides alternative opportunities for exploring ultrafast room-temperature magnon-based devices.
绝缘补偿亚铁磁体，尤其是具有室温补偿点的亚铁磁体，由于兼具铁磁体和反铁磁体的特性，被认为是开发超高密度和超快磁振子器件的有前途的候选材料。这些引人入胜的特性在接近其补偿点时变得尤为突出。然而，它们的自旋轨道扭矩（SOT）诱导的磁化翻转，特别是在补偿点附近，仍然不清楚。在此，我们系统地研究了具有垂直磁各向异性的绝缘补偿亚铁磁体GdFeO/Pt异质结构中的SOT。通过磁化曲线、自旋霍尔诱导的反常霍尔效应和自旋霍尔磁阻测量，一致确定了一个接近室温的补偿点（约297 K）。此外，使用持续时间为100 ns的脉冲电流，即使在294 K和301 K时，在补偿点上下都实现了具有相反翻转极性的确定性电流诱导磁化翻转。结果发现，尽管有效SOT场在接近补偿点时会增加，但在补偿点附近切换磁化仍需要较大的电流。我们的发现为探索基于超快室温磁振子的器件提供了新的机会。
