arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.00348cond-mat.supr-conphysics.app-ph
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邻近耦合超导/铁磁/超导多层膜的磁化动力学

Magnetization dynamics in proximity-coupled superconductor/ferromagnet/superconductor multilayers

I. A. Golovchanskiy, N. N. Abramov, V. S. Stolyarov, V. I. Chichkov, M. Silayev, I. V. Shchetinin, A. A. Golubov, V. V. Ryazanov, A. V. Ustinov, M. Yu. Kupriyanov

摘要:

在这项工作中,磁化动力学研究在超导体/铁磁体/超导体三层膜在一个宽的频率,字段和温度范围内使用宽带铁磁共振测量技术。结果表明,在存在的超导层和超导接近在两个超导体/铁磁界面的铁磁共振出现了巨大的位移到更高的频率。这种现象是鲁棒的,基本上是长范围的:它已被观察到的一组样品的铁磁层的厚度范围从几十到几百纳米。共振频移的特征在于邻近感生的磁各向异性:由正的面内单轴各向异性和由磁化下降。位移和相应的单轴各向异性随铁磁层厚度的增加而增加。例如,对于350 nm厚的铁磁层,实验测得其各向异性达到0.27 T,而预测值约为0.4 T,这使其成为迄今报道的各向异性最高、自然谐振频率最高的铁磁薄膜结构。各种方案的超导性引起的磁各向异性进行了讨论。因此,这一现象的起源仍不清楚。提出了利用邻近诱导各向异性进行自旋波谱操纵的一种方法。

英文摘要:

In this work, magnetization dynamics is studied in superconductor/ferromagnet/superconductor three-layered films in a wide frequency, field, and temperature ranges using the broad-band ferromagnetic resonance measurement technique. It is shown that in presence of both superconducting layers and of superconducting proximity at both superconductor/ferromagnet interfaces a massive shift of the ferromagnetic resonance to higher frequencies emerges. The phenomenon is robust and essentially long-range: it has been observed for a set of samples with the thickness of ferromagnetic layer in the range from tens up to hundreds of nanometers. The resonance frequency shift is characterized by proximity-induced magnetic anisotropies: by the positive in-plane uniaxial anisotropy and by the drop of magnetization. The shift and the corresponding uniaxial anisotropy grow with the thickness of the ferromagnetic layer. For instance, the anisotropy reaches 0.27~T in experiment for a sample with 350~nm thick ferromagnetic layer, and about 0.4~T in predictions, which makes it a ferromagnetic film structure with the highest anisotropy and the highest natural resonance frequency ever reported. Various scenarios for the superconductivity-induced magnetic anisotropy are discussed. As a result, the origin of the phenomenon remains unclear. Application of the proximity-induced anisotropies in superconducting magnonics is proposed as a way for manipulations with a spin-wave spectrum.

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