太赫兹频率下共振增强声子交换磁振子相互作用的研究

IF 2.6 4区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Magnetochemistry Pub Date : 2023-07-17 DOI:10.3390/magnetochemistry9070184
Tudor-Gabriel Mocioi, Antonia Ghita, V. Temnov
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引用次数: 2

摘要

使用有效的实验参数,我们量化了独立铁磁镍薄膜中交换磁振子的共振声子驱动进动的大小及其厚度L。磁振子振荡器的声学驱动方程的解析解显示出峰值磁化进动对薄膜厚度的非单调依赖性。这可以用多个前置因子在总磁化动力学表达式中的不同L依赖性来解释。根据声学和磁性(Gilbert)阻尼常数的比值,磁化进动被声子或磁振子共振的Q因子放大。对于较薄的膜,声子模振幅的增加也被发现是显著的。关注由p=1和p=2的两个第一声本征模激发的磁化动力学,我们预测了镍膜的最佳厚度,以在合理低的外部磁场值下在多个100GHz频率下实现大振幅磁化进动。通过将研究扩展到Ni-Si双层的情况,我们表明这些共振在更高的频率下是可以实现的,接近太赫兹范围。
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Towards Resonantly Enhanced Acoustic Phonon-Exchange Magnon Interactions at THz Frequencies
Using valid experimental parameters, we quantify the magnitude of resonantly phonon-driven precession of exchange magnons in freestanding ferromagnetic nickel thin films on their thickness L. Analytical solutions of acoustically driven equations for magnon oscillators display a nonmonotonous dependence of the peak magnetization precession on the film thickness. It is explained by different L-dependence of multiple prefactors entering in the expression for the total magnetization dynamics. Depending on the ratio of acoustic and magnetic (Gilbert) damping constants, the magnetization precession is shown to be amplified by a Q-factor of either the phonon or the magnon resonance. The increase in the phonon mode amplitude for thinner membranes is also found to be significant. Focusing on the magnetization dynamics excited by the two first acoustic eigenmodes with p=1 and p=2, we predict the optimum thicknesses of nickel membranes to achieve large amplitude magnetization precession at multi 100 GHz frequencies at reasonably low values of an external magnetic field. By extending the study to the case of Ni-Si bilayers, we show that these resonances are achievable at even higher frequencies, approaching the THz range.
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来源期刊
Magnetochemistry
Magnetochemistry Chemistry-Chemistry (miscellaneous)
CiteScore
3.90
自引率
11.10%
发文量
145
审稿时长
11 weeks
期刊介绍: Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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