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arXiv · 1903.00498

Nanoscale X-Ray Imaging of Spin Dynamics in Yttrium Iron Garnet

J. Förster·S. Wintz·J. Bailey·S. Finizio·E. Josten·D. Meertens·C. Dubs·D. A. Bozhko·H. Stoll·G. Dieterle·N. Träger·J. Raabe·A. N. Slavin·M. Weigand·J. Gräfe·G. Schütz
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Abstract

Time-resolved scanning transmission x-ray microscopy (TR-STXM) has been used for the direct imaging of spin wave dynamics in thin film yttrium iron garnet (YIG) with spatial resolution in the sub 100 nm range. Application of this x-ray transmission technique to single crystalline garnet films was achieved by extracting a lamella (13x5x0.185 $\mathrm{\mu m^3}$) of liquid phase epitaxy grown YIG thin film out of a gadolinium gallium garnet substrate. Spin waves in the sample were measured along the Damon-Eshbach and backward volume directions of propagation at gigahertz frequencies and with wavelengths in a range between 100~nm and 10~$\mathrm{\mu}$m. The results were compared to theoretical models. Here, the widely used approximate dispersion equation for dipole-exchange spin waves proved to be insufficient for describing the observed Damon-Eshbach type modes. For achieving an accurate description, we made use of the full analytical theory taking mode-hybridization effects into account.

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J. Förster, S. Wintz, J. Bailey, S. Finizio, E. Josten, D. Meertens, C. Dubs, D. A. Bozhko, H. Stoll, G. Dieterle, N. Träger, J. Raabe, A. N. Slavin, M. Weigand, J. Gräfe, G. Schütz. 2019-03-01. Nanoscale X-Ray Imaging of Spin Dynamics in Yttrium Iron Garnet. https://doi.org/10.1063/1.5121013

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