Strongly extended diffusion length for the nonequilibrium magnons in Y3Fe5O12 by photoexcitation

Wang, S. H.; Li, G.; Guo, E. J.; Zhao, Y.; Wang, J. Y.; Zou, L. K.; Yan, H.; Cai, J. W.; Zhang, Z. T.; Wang, M.; Tian, Y. Y.; Zheng, X. L.; Sun, J. R.; Jin, K. X.

doi:10.1103/PhysRevMaterials.2.051401

Title: Strongly extended diffusion length for the nonequilibrium magnons in $Y_{3} F e_{5} O_{12}$ by photoexcitation

Journal Article · Wed May 09 00:00:00 EDT 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.051401· OSTI ID:1437892

Wang, S. H. ^[1]; Li, G. ^[2];

^[3]; Zhao, Y. ^[1]; Wang, J. Y. ^[1]; Zou, L. K. ^[4]; Yan, H. ^[1]; Cai, J. W. ^[2]; Zhang, Z. T. ^[1]; Wang, M. ^[1]; Tian, Y. Y. ^[1]; Zheng, X. L. ^[2]; Sun, J. R. ^[2]; Jin, K. X. ^[1]

Northwestern Polytechnical Univ., Xi'an (China)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Science, Hefei (China)

Y₃Fe₅O₁₂ (YIG) is known for its long magnon diffusion length. Although it has the known lowest damping rate, an even longer diffusion distance is still highly desired since it may lead to a much more efficient information transmission and processing. While most of previous works focused on the generation and detection of magnons in YIG, here we demonstrate how to depress the damping rate during the diffusion of magnon. By selectively exciting the spin state transition of the Fe ions in YIG, we successfully increase magnon diffusion length by one order of magnitude, i.e., from the previous reported ~10 μm up to ~156 μm (for the sample prepared by liquid phase epitaxy) and ~180 μm (for the sample prepared by pulsed laser deposition) at room temperature. The diffusion length, determined by nonlocal geometry, is ~30 μm for the magnons induced by visible light and above 150 μm for the laser of 980 nm. In addition to thermal gradient, light excitation affects the electron configuration of the Fe³⁺ ion in YIG. Long-wavelength laser is more effective since it causes a transition of the Fe³⁺ ions in FeO₆ octahedron from a high spin to a low spin state and thus causes a magnon softening which favors a long-distance diffusion. Furthermore, the present work paves the way toward an efficient tuning of magnon transport which is crucially important for magnon spintronics.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1437892

Journal Information:: Physical Review Materials, Vol. 2, Issue 5; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Title: Strongly extended diffusion length for the nonequilibrium magnons in $Y_{3} F e_{5} O_{12}$ by photoexcitation