Scattering theory of Gilbert damping
Scattering theory of Gilbert damping
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DOI：
10.1103/physrevlett.101.037207
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发表时间：
2008-07-18
影响因子：
8.6
通讯作者：
Bauer, Gerrit E. W.
中科院分区：
文献类型：
--
作者：
Brataas, Arne;Tserkovnyak, Yaroslav;Bauer, Gerrit E. W.
用散射理论研究了与热液接触的单畴铁磁体的磁化动力学。我们恢复了Landau-Liftshitz-Gilbert方程，并用散射矩阵表示了有效场和Gilbert阻尼张量。磁能量耗散等于随时间磁化泵出系统的能量电流，自旋弛豫诱导的体积和自旋泵送产生的界面贡献是可分离的。在线性响应中，Gilbert阻尼张量的散射理论与Kubo形式等价。
The magnetization dynamics of a single domain ferromagnet in contact with a thermal bath is studied by scattering theory. We recover the Landau-Liftshitz-Gilbert equation and express the effective fields and Gilbert damping tensor in terms of the scattering matrix. Dissipation of magnetic energy equals energy current pumped out of the system by the time-dependent magnetization, with separable spin-relaxation induced bulk and spin-pumping generated interface contributions. In linear response, our scattering theory for the Gilbert damping tensor is equivalent with the Kubo formalism.