First-Principles Study on the Magnetic Damping of Transition Metals in the Presence of Spin Fluctuation

Dai Ozaki; Daisuke Miura; Akimasa Sakuma

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First-Principles Study on the Magnetic Damping of Transition Metals in the Presence of Spin Fluctuation

机译：自旋涨落下过渡金属磁阻尼的第一性原理研究

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We calculated, from first principles, the Landau frequency λ to investigate the effects of spin fluctuation on the magnetic damping of Fe and Ni metals as well as L1₀-type ordered alloys, namely, FePt, CoPt, FePd, and MnAl, assuming random arrangements of spins as an effect of thermal activation through coherent potential approximation and the tight-binding linear muffin-tin orbital method. The results show that the λ of these systems are similar to conductivity in the weak spin fluctuation region and resistivity in the strong fluctuation region as well as in the lattice vibration system. Qualitatively, this behavior is consistent with the experimental results for temperature dependence of the λ of Fe and Ni metals. For L1₀-type alloys, the magnitude of the magnetic damping is in the following (decreasing) order: CoPt, FePt, FePd, and MnAl.

机译：我们从第一原理中计算出Landau频率λ，以研究自旋涨落对Fe和Ni金属以及L1 _{0 型有序合金FePt，CoPt， FePd和MnAl，假定自旋的随机排列是通过相干势近似和紧密结合的线性松饼-锡轨道方法对热激活的影响。结果表明，这些系统的λ与弱自旋起伏区域的电导率相似，在强起伏区域以及晶格振动系统中的电阻率相似。定性地，此行为与Fe和Ni金属的λ的温度依赖性的实验结果一致。对于L1 _{0 型合金，磁阻尼的大小按以下（递减）顺序：CoPt，FePt，FePd和MnAl。}}

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《IEEE Transactions on Magnetics》 |2017年第11期|1-4|共4页
作者
Dai Ozaki; Daisuke Miura; Akimasa Sakuma;
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正文语种 eng
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关键词
Magnetomechanical effects; Magnetization; Damping; Scattering; Iron; Temperature dependence;

机译：磁机械效应;磁化;阻尼;散射;铁;温度依赖性;

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First-Principles Study on the Magnetic Damping of Transition Metals in the Presence of Spin Fluctuation

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