Amplification and stabilization of large-amplitude propagating spin waves by parametric pumping
Amplification and stabilization of large-amplitude propagating spin waves by parametric pumping
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DOI：
10.1063/1.5019357
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发表时间：
2018-01
影响因子：
4
通讯作者：
R. Verba;M. Carpentieri;G. Finocchio;V. Tiberkevich;A. Slavin
中科院分区：
文献类型：
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作者：
R. Verba;M. Carpentieri;G. Finocchio;V. Tiberkevich;A. Slavin
通过解析和微磁学模拟研究了局域参量泵浦与不同振幅自旋波在铁磁纳米线中传播的相互作用。结果表明，由于非线性4-磁振子过程的影响，自旋波的参量放大效率随着自旋波振幅的增加而降低。在自旋波振幅的一定范围内，参量放大器充当自旋波振幅的稳定器，因为其作用显著地减小自旋波振幅在某一平均值附近的扩展。与自旋波平均自由程相比，泵浦局域化区的相对长度越大，泵浦强度越高，稳定效应越明显。相反，使用相对较短的泵浦局域化区可以有效地放大大振幅的非线性自旋波。研究分析和微磁模拟。结果表明，由于非线性4-磁振子过程的影响，自旋波的参量放大效率随着自旋波振幅的增加而降低。在自旋波振幅的一定范围内，参量放大器充当自旋波振幅的稳定器，因为其作用显著地减小自旋波振幅在某一平均值附近的扩展。与自旋波平均自由程相比，泵浦强度越高，泵浦局域区的相对长度越大，稳定效应越明显，相反，使用相对较短的泵浦局域区可以有效地放大大振幅的非线性自旋波。
The interaction of a localized parametric pumping with spin waves of different amplitudes, propagating in a ferromagnetic nanowire, is studied analytically and by micromagnetic simulations. It is shown that parametric amplification of spin waves by localized pumping becomes less efficient with an increase in the spin wave amplitude due to the influence of nonlinear 4-magnon processes. In a certain range of spin wave amplitudes, the parametric amplifier acts as a stabilizer of the spin wave amplitude, as its action significantly reduces the spread of the spin wave amplitude in the vicinity of a certain mean value. The stabilization effect becomes more pronounced for higher pumping strength and larger relative lengths of the pumping localization region, compared to the spin wave mean free path. In contrast, the use of relatively short pumping localization regions allows one to efficiently amplify large-amplitude nonlinear spin waves.The interaction of a localized parametric pumping with spin waves of different amplitudes, propagating in a ferromagnetic nanowire, is studied analytically and by micromagnetic simulations. It is shown that parametric amplification of spin waves by localized pumping becomes less efficient with an increase in the spin wave amplitude due to the influence of nonlinear 4-magnon processes. In a certain range of spin wave amplitudes, the parametric amplifier acts as a stabilizer of the spin wave amplitude, as its action significantly reduces the spread of the spin wave amplitude in the vicinity of a certain mean value. The stabilization effect becomes more pronounced for higher pumping strength and larger relative lengths of the pumping localization region, compared to the spin wave mean free path. In contrast, the use of relatively short pumping localization regions allows one to efficiently amplify large-amplitude nonlinear spin waves.