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在表面声波腔共振器中合成反铁磁体的磁 - 声波合
Hiroki Matsumoto1, Isamu Yasuda1, Motoki Asano2
1Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan.
Nano letters
|April 25, 2024
概括
合成反铁磁铁 (SAF) 允许使用表面声波 (SAW) 共振器研究磁声声合. 这项研究量化了合强度,揭示了SAF是此类调查的理想平台.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子声学 量子声学是一种
- 材料科学 材料科学 材料科学
背景情况:
- 研究磁兴奋 (magnons) 和声波 (phonons) 之间的相互作用对于开发先进的自旋和量子设备至关重要.
- 表面声波 (SAWs) 提供了一个有前途的途径,以调解和检测这些相互作用,因为他们的有限的性质和可调节的频率.
研究的目的:
- 探索和量化合成反铁磁体 (SAF) 中的声磁子和通过 SAWs传播的声磁子之间的合.
- 评估SAF的有效性,作为研究SAW腔共振器内的磁声互动的平台.
主要方法:
- 使用表面声波 (SAW) 腔共振器来探测合.
- 制造了一种合成反铁磁体 (SAF) 结构,包括一个CoFeB/Ru/CoFeB三层.
- 分析了SAW共振器的散射矩阵,并测量了光谱线宽调制.
- 采用宏式模型计算来解释实验观察结果.
主要成果:
- 观察到SAW共振器的光谱线宽的调制,因为马格农频率接近SAW共振频率.
- 通过理论建模,成功地复制了观察到的线宽变化.
- 估计magnon-phonon合强度在1.8 GHz SAW共振频率下大约为9.9 MHz.
- 确定了大约0.66.6的磁力合作性.
- 在单层CoFeB参考样本中发现了最小的光谱形状变化,突出了SAF结构的重要性.
结论:
- 合成反铁磁铁 (SAF) 在与SAW腔共振器集成时表现出显著的磁声声合.
- 观测到的现象是很好地描述的宏类似的模型,允许对合参数的定量估计.
- SAF结构为基础研究和潜在的应用提供了一个有利的平台,涉及声学共振器中的磁声声互动.
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