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首页> 外文期刊>Physical review >Evolution of damping in ferromagneticonmagnetic thin film bilayers as a function of nonmagnetic layer thickness
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Evolution of damping in ferromagneticonmagnetic thin film bilayers as a function of nonmagnetic layer thickness

机译：铁磁性/非磁性薄膜双层中阻尼的变化与非磁性层厚度的关系

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摘要

The evolution of damping in Co/Pt, Co/Au, and Ni_(81)Fe_(19)/Pt bilayers was studied with increasing nonmagnetic (NM) heavy-metal layer thicknesses in the range 0.2 nm ≤ t_(NM) ≤ 10 nm, where t_(NM) is the NM layer thickness. Magnetization precession was measured in the time domain using time-resolved magneto-optical Kerr effect magnetometry. Fitting of the data with a damped sinusoidal function was undertaken in order to extract the phenomenological Gilbert damping coefficient α. For Pt-capped Co and Ni_(81)Fe_(19) layers a large and complex dependence of a on the Pt layer thickness was observed, while for Au capping no significant dependence was observed. It is suggested that this difference is related to the different localized spin-orbit interaction related to intermixing and to d-d hybridization of Pt and Au at the interface with Co or Ni_(81)Fe_(19). Also it was shown that damping is affected by the crystal structure differences in FM thin films and at the interface, which can modify the spin-diffusion length and the effective spin-mixing conductance. In addition to the intrinsic damping an extrinsic contribution plays an important role in the enhancement of damping when the Pt capping layer is discontinuous. The dependence of damping on the nonmagnetic layer thickness is complex but shows qualitative agreement with recent theoretical predictions.
机译：研究了在0.2 nm≤t_（NM）≤10范围内增加非磁性（NM）重金属层厚度时Co / Pt，Co / Au和Ni_（81）Fe_（19）/ Pt双层中阻尼的演变情况nm，其中t_（NM）是NM层厚度。使用时间分辨磁光克尔效应磁强计在时域中测量了磁化进动。为了提取现象学的吉尔伯特阻尼系数α，对数据进行了阻尼正弦函数拟合。对于Pt封盖的Co和Ni_（81）Fe_（19）层，观察到a对Pt层厚度的较大且复杂的依赖性，而对于Au封端，则未观察到明显的依赖性。有人认为，这种差异与与Co或Ni_（81）Fe_（19）交界处的Pt和Au的相互混合和d-d杂交有关的不同的局部自旋轨道相互作用有关。还表明阻尼受FM薄膜和界面处晶体结构差异的影响，这可以改变自旋扩散长度和有效的自旋混合电导率。当Pt覆盖层不连续时，除了固有阻尼外，外来贡献在增强阻尼方面也起着重要作用。阻尼对非磁性层厚度的依赖性很复杂，但与最近的理论预测在质量上吻合。

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  • 来源
    《Physical review》 |2016年第5期|054402.1-054402.6|共6页
  • 作者

    S. Azzawi; A. Ganguly; M. Tokac; R. M. Rowan-Robinson; J. Sinha; A. T. Hindmarch; A. Barman; D. Atkinson;

  • 作者单位

    Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom;

    Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, India;

    Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom;

    Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom;

    Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, India;

    Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom;

    Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, India;

    Centre for Materials Physics, Durham University, South Road, Durham DH1 3LE, United Kingdom;

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