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arXiv 2109.05045cond-mat.mes-hall
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掺镓钇铁石榴石中自旋波色散和双稳态的电学谱

Electrical spectroscopy of the spin-wave dispersion and bistability in gallium-doped yttrium iron garnet

Joris J. Carmiggelt, Olaf C. Dreijer, Carsten Dubs, Oleksii Surzhenko, Toeno van der Sar

摘要:

钇铁石榴石(YIG)是一种磁绝缘体,具有创纪录的低阻尼,允许自旋波在宏观距离上传输。用镓离子掺杂YIG极大地降低了退磁场并引入了垂直磁各向异性,这导致各向同性自旋波色散,这有利于自旋波动光学和自旋波转向。在这里,我们使用电子光谱的特征分散的镓掺杂的YIG(Ga:YIG)薄膜。我们确定的磁各向异性参数从铁磁共振频率和使用传播自旋波谱的Damon-Eshbach配置,以检测小自旋波磁场的这种弱磁体在很宽的波矢范围内,使提取的交换常数$α=1.3(2)\times10^{-12}$ J/m。自旋波的频率随着驱动功率的增加而移动,这最终导致自旋波模式的折叠。我们的研究结果揭示了各向同性自旋波输运在Ga:YIG和突出的潜力,电子光谱映射出的色散和双稳态传播自旋波在磁体具有低饱和磁化强度。

英文摘要:

Yttrium iron garnet (YIG) is a magnetic insulator with record-low damping, allowing spin-wave transport over macroscopic distances. Doping YIG with gallium ions greatly reduces the demagnetizing field and introduces a perpendicular magnetic anisotropy, which leads to an isotropic spin-wave dispersion that facilitates spin-wave optics and spin-wave steering. Here, we characterize the dispersion of a gallium-doped YIG (Ga:YIG) thin film using electrical spectroscopy. We determine the magnetic anisotropy parameters from the ferromagnetic resonance frequency and use propagating spin wave spectroscopy in the Damon-Eshbach configuration to detect the small spin-wave magnetic fields of this ultrathin weak magnet over a wide range of wavevectors, enabling the extraction of the exchange constant $α=1.3(2)\times10^{-12}$ J/m. The frequencies of the spin waves shift with increasing drive power, which eventually leads to the foldover of the spin-wave modes. Our results shed light on isotropic spin-wave transport in Ga:YIG and highlight the potential of electrical spectroscopy to map out the dispersion and bistability of propagating spin waves in magnets with a low saturation magnetization.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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