中国科学技术大学自旋电子材料与器件实验室--自旋电子材料与器件实验室-- Li R, Li P, Yi D, et al. Anisotropic magnon spin transport in ultrathin spinel ferrite thin films─ evidence for anisotropy in exchange stiffness[J]. Nano Letters, 2022, 22(3): 1167-1173.

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Li R, Li P, Yi D, et al. Anisotropic magnon spin transport in ultrathin spinel ferrite thin films─ evidence for anisotropy in exchange stiffness[J]. Nano Letters, 2022, 22(3): 1167-1173.

发布时间：2024-04-23点击次数：

发表刊物：
Nano Letters
摘要：
Magnon-mediated spin flow in magnetically ordered insulators enables long-distance spin-based information transport with low dissipation. In the materials studied to date, no anisotropy has been observed in the magnon propagation length as a function of propagation direction. Here, we report measurements of magnon spin transport in a spinel ferrite, magnesium aluminum ferrite MgAl0.5Fe1.5O4 (MAFO), which has a substantial in-plane 4-fold magnetic anisotropy. We observe spin diffusion lengths > 0.8 μm at room temperature in 6 nm films, with spin diffusion lengths 30% longer along the easy axes compared to the hard axes. The sign of this difference is opposite to the effects just of anisotropy in the magnetic energy for a uniform magnetic state. We suggest instead that accounting for anisotropy in exchange stiffness is necessary to explain these results. These findings provide an approach for controlling magnon transport via strain, which opens new opportunities for designing magnonic devices.
论文类型：
期刊论文
卷号：
22
期号：
3
页面范围：
1167-1173
是否译文：
否
发表时间：
2021-11-12
发布期刊链接：
https://doi.org/10.1021/acs.nanolett.1c04332

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