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RESEARCH PRODUCT
Nanoscale X-Ray Imaging of Spin Dynamics in Yttrium Iron Garnet
Georg DieterleAndrei SlavinDoris MeertensJoachim GräfeJ. RaabeSebastian WintzNick TrägerSimone FinizioMarkus WeigandHermann StollCarsten DubsJoe BaileyDmytro A. BozhkoGisela SchützElisabeth JostenJohannes Förstersubject
Yttrium iron garnetFOS: Physical sciencesGeneral Physics and AstronomyLarge scale facilities for research with photons neutrons and ions02 engineering and technologySubstrate (electronics)Epitaxy01 natural scienceschemistry.chemical_compoundCondensed Matter::Materials ScienceSpin waveDispersion relationMesoscale and Nanoscale Physics (cond-mat.mes-hall)0103 physical sciencesThin film010302 applied physicsPhysicsMicroscopyCondensed matter physicsCondensed Matter - Mesoscale and Nanoscale PhysicsGadolinium gallium garnetYIG021001 nanoscience & nanotechnologyWavelengthchemistryMagnonics0210 nano-technologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-03-01 |