期刊
APPLIED PHYSICS LETTERS
卷 117, 期 24, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0032940
关键词
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资金
- Graduate School of Excellence Materials Science in Mainz [DFG/GSC 266]
- Max Planck Graduate Center
- Johannes Gutenberg-Universitat Mainz (MPGC)
- DFG [423441604]
- European Union [752195]
- Horizon 2020 Framework Programme of the European Commission under FET-Open [863155]
- Alexander von Humboldt Foundation
- ERC Synergy Grant SC2 [610115]
- MaHoJeRo (DAAD Spintronics network) project [57334897, 57524834]
- KAUST [OSR-2019-CRG8-4048.2]
- European Research Council under the European Union's Seventh Framework programme [617516]
- Center for Absorption in Science, Ministry of Immigrant Absorption, State of Israel
- Research Council of Norway through its Centres of Excellence funding scheme [262633]
- European Union's Horizon 2020 research and innovation programme under Marie Sklodowska-Curie Grant [793159, MM23819-1]
- SPIN+X (DFG SFB, projects) [TRR 173]
We report room-temperature long-distance spin transport of magnons in antiferromagnetic thin-film hematite doped with Zn. The additional dopants significantly alter the magnetic anisotropies, resulting in a complex equilibrium spin structure that is capable of efficiently transporting spin angular momentum at room temperature without the need for a well-defined, pure easy-axis or easy-plane anisotropy. We find intrinsic magnon spin-diffusion lengths of up to 1.5 mu m, and magnetic domain governed decay lengths of 175nm for the low-frequency magnons, through electrical transport measurements demonstrating that the introduction of nonmagnetic dopants does not strongly reduce the transport length scale, showing that the magnetic damping of hematite is not significantly increased. We observe a complex field dependence of the nonlocal signal independent of the magnetic state visible, in the local magnetoresistance and direct magnetic imaging of the antiferromagnetic domain structure. We explain our results in terms of a varying and applied field-dependent ellipticity of the magnon modes reaching the detector electrode allowing us to tune the spin transport. Published under license by AIP Publishing.
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