Time-resolved study of nonlinear three-magnon processes in yttrium iron garnet films

Time-resolved study of nonlinear three-magnon processes in yttrium iron garnet films
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钇铁石榴石薄膜中非线性三磁振子过程的时间分辨研究

DOI:
10.1103/physrevb.99.024429
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发表时间:
2019
期刊:
影响因子:
3.7
通讯作者:
Buchanan, Kristen S.
Buchanan, Kristen S.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, H. J. Jason;Riley, Grant A.;Ordóñez-Romero, César L.;Kalinikos, Boris A.;Buchanan, Kristen S.

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在这项工作中,时间方面的两个非线性自旋波过程,即,三磁振子分裂和汇合,在钇铁石榴石膜进行了研究。三磁振子分裂是指一个磁振子在微波泵浦频率下转换成两个磁振子,每个磁振子的频率都很接近,而汇合是指两个分裂的磁振子随后组合成一个频率。时间分辨布里渊散射测量证实,这些过程发生在靠近驱动天线(远离),这是预期的。然而,数据表明,具有较大群速度的磁振子更有可能发生汇合,这是现有理论所不能预测的。了解分裂和汇合过程的细节可能对短波长自旋波用于自旋电子器件具有重要意义。
In this work, the temporal aspects of two nonlinear spin-wave processes, i.e., three-magnon splitting and confluence, were investigated in a yttrium iron garnet film. Three-magnon splitting involves the conversion of a magnon at the microwave pumping frequencyinto two magnons, each with a frequency near, while confluence refers to the subsequent combination of two of the split magnons into one with frequency. Time-resolved Brillouin scattering measurements confirm that these processes occur close to the driving antenna (away), which is expected. The data indicate, however, that magnons with larger group velocities are more likely to undergo confluence, which is not predicted by existing theory. Understanding the details of the splitting and confluence processes may have important implications for the use of short-wavelength spin waves for spintronic devices.
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影响因子: 4
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