尖晶石铁氧体中长波长与短波长磁振子阻尼的差异
Divergence between long- and short-wavelength magnon damping in spinel ferrites
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中文总结 AI 辅助
该研究通过结合FMR和RIXS探测尖晶石铁氧体，发现铝替代显著降低磁振子带宽并缩短高q寿命，与长波长低阻尼形成对比，为磁振子器件材料评估提供新视角。
中文摘要 AI 辅助
实现实用高速磁振子器件需要在宽频率范围内设计具有低耗散的磁性材料。虽然光学和微波探针被用于推断低能量/长波长模式的阻尼，但这些$q\sim0$特性在多大程度上转化为更高能量、有限动量模式仍是一个重要的开放问题。在此，我们结合铁磁共振（FMR）和共振非弹性X射线散射，对尖晶石铁氧体Li$_{0.5}$Al$_x$Fe$_{2.5-x}$O$_4$中的磁振子进行短波长和长波长极限下的探测。我们观察到，铝替代既显著减小了磁振子带宽，又大幅缩短了高$q$磁振子寿命，这与从FMR推断出的超低磁振子阻尼形成鲜明对比。这些发现表明，非磁性替代物在长波长和短波长极限下对磁振子阻尼的影响存在差异，为评估磁振子器件的候选材料提供了新视角。
英文摘要
The realization of practical, high-speed magnonic devices requires engineering magnetic materials with low dissipation over wide frequency ranges. While optical and microwave probes are used to infer the damping of low energy/long wavelength modes, the degree to which these $q\sim0$ properties translate into higher-energy, finite-momentum modes remains an important open question. Here, we utilize a combination of ferromagnetic resonance (FMR) and resonant inelastic x-ray scattering on spinel ferrites Li$_{0.5}$Al$_x$Fe$_{2.5-x}$O$_4$ to probe magnons in both the short- and long-wavelength limits. We observe that aluminum substitution both markedly reduces the magnon bandwidth and drastically shortens the high-$q$ magnon lifetimes, in sharp contrast to the ultralow magnon damping inferred from FMR. These findings demonstrate a disparity between how non-magnetic substituents impact magnon damping in the long- and short-wavelength limits, providing a new perspective for assessing candidate materials for magnonic devices.
发表机构
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory（斯坦福材料能源科学研究所，SLAC国家加速器实验室）
- Department of Physics and Astronomy, University of Iowa（爱荷华大学物理与天文系）
- Department of Physics, Stanford University（斯坦福大学物理系）
- Geballe Laboratory for Advanced Materials, Stanford University（斯坦福大学先进材料盖伯实验室）
- Department of Applied Physics, Stanford University（斯坦福大学应用物理系）
- Department of Materials Science and Engineering, Stanford University（斯坦福大学材料科学与工程系）
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