Compositional effect on auto-oscillation behavior of Ni 100 −xFex/Pt spin Hall nano-oscillators

M. Haidar, H. Mazraati, P. Dürrenfeld, H. Fulara, M. Ranjbar, J. Åkerman
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引用次数: 10

Abstract

We demonstrate the compositional effect on the magnetodynamic and auto-oscillations properties of Ni100-xFex/Pt (x= 10 to 40) nanoconstriction based spin Hall nano-oscillators. Using spin-torque ferromagnetic resonance (ST-FMR) performed on microstrips, we measure a significant reduction in both damping and spin Hall efficiency with increasing Fe content, which lowers the spin pumping contribution. The strong compositional effect on spin Hall efficiency is primarily attributed to the increased saturation magnetization in Fe-rich devices. As a direct consequence, higher current densities are required to drive spin-wave auto-oscillations at higher microwave frequencies in Fe-rich nano-constriction devices. Our results establish the critical role of the compositional effect in engineering the magnetodynamic and auto-oscillation properties of spin Hall devices for microwav eand magnonic applications.
组分对Ni 100−xFex/Pt自旋霍尔纳米振荡器自振荡行为的影响
我们证明了成分对Ni100-xFex/Pt (x= 10 ~ 40)纳米收缩自旋霍尔振荡器的磁动力和自振荡特性的影响。利用在微带上进行的自旋转矩铁磁共振(ST-FMR),我们测量到随着铁含量的增加,阻尼和自旋霍尔效率都显著降低,这降低了自旋泵浦的贡献。富铁器件的饱和磁化强度增加,对自旋霍尔效率产生了强烈的影响。直接的结果是,在富铁纳米收缩器件中,需要更高的电流密度来驱动高微波频率下的自旋波自振荡。我们的研究结果确立了组分效应在工程中对微波和磁振应用的自旋霍尔器件的磁动力和自振荡特性的关键作用。
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