Thermal Control of the Intrinsic Magnetic Damping in a Ferromagnetic Metal,Physical Review Applied

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Thermal Control of the Intrinsic Magnetic Damping in a Ferromagnetic Metal
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-21 , DOI: 10.1103/physrevapplied.16.014051
José Holanda ₁ , O. Alves Santos ₂ , Sergio M. Rezende ₃

Affiliation

We report experiments on the control of intrinsic magnetic damping by thermal torque effects produced by the spin Seebeck effect and the anomalous Nernst effect in a thin layer of a ferromagnetic metal (Permalloy (Py),

{Ni}_{81} {Fe}_{19}

). Damping is measured in ferromagnetic resonance (FMR) experiments on a sample excited by microwave radiation and detected by the dc-voltage-generated spin rectification and magnonic charge pumping in the Py film. Application of a temperature gradient in the longitudinal configuration increases or decreases the dc-voltage line width, depending on the sign of the thermal gradient, demonstrating that the magnetic damping in Py is controlled by currents generated by thermal effects. The absolute values of the line-width changes in Py may reach 1 order of magnitude larger than in the ferrimagnetic insulator yttrium iron garnet. The large change in magnetic damping is interpreted as a superposition of different phenomena in the same metallic ferromagnet.

中文翻译：

铁磁金属中本征磁阻尼的热控制

我们报告了通过自旋塞贝克效应和铁磁金属薄层（坡莫合金（Py）中的异常能斯特效应产生的热扭矩效应）控制固有磁阻尼的实验，

你_{81} 铁_{19}

）。阻尼是在铁磁共振 (FMR) 实验中对由微波辐射激发的样品进行测量的，并通过直流电压产生的自旋整流和 Py 膜中的磁子电荷泵检测。在纵向配置中应用温度梯度会增加或减少直流电压线宽度，具体取决于热梯度的符号，这表明 Py 中的磁阻尼受热效应产生的电流控制。Py 中线宽变化的绝对值可能比亚铁磁绝缘体钇铁石榴石大 1 个数量级。磁阻尼的巨大变化被解释为同一金属铁磁体中不同现象的叠加。

更新日期：2021-07-21

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