Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Spin currents and spin torques
MA 27.6: Vortrag
Mittwoch, 14. März 2018, 10:45–11:00, EB 407
Unidirectional angular momentum transport in obliquely magnetized magnetic films — •Dmytro A. Bozhko1, Halyna Yu. Musiienko-Shmarova1, Vasyl S. Tyberkevych2, Andrei N. Slavin2, Ihor I. Syvorotka3, Burkard Hillebrands1, and Alexander A. Serga1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Germany — 2Department of Physics, Oakland University, USA — 3Department of Crystal Physics and Technology, SRC “Carat”, Ukraine
Thermal spectra of dipole-exchange magnons in an obliquely magnetized yttrium iron garnet (YIG) film were measured in a wide range of wavenumbers using a newly developed wavevector- and angle-resolved Brillouin light scattering (BLS) spectrometer. The YIG film of 5.6 µm thickness was grown in the (111) crystallographic plane on a gadolinium-gallium-garnet substrate by liquid-phase epitaxy. The experimentally measured magnon spectra agree well with the results of a theoretical analysis where transverse (thickness) profiles of the magnon modes were calculated. Calculations show that in the case of an in-plane magnetized film the thickness profile of the lowest magnon mode is a standing wave demonstrating dipolar “pinning”, that gradually increases with the increase of the magnon in-plane wavenumber. In contrast, in the case of an oblique (out-of-plane) magnetization the thickness profiles of the magnon modes turn out to be quasi-traveling waves that do not transfer energy, but create a unidirectional flow of spin angular momentum (or spin current) along the film thickness. The work is supported by the DFG within the SFB/TR 49.