Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: PhD Symposium: Ultrafast spin-lattice interactions (joint session MA/AKjDPG)

MA 17.6: Hauptvortrag

Dienstag, 13. März 2018, 12:15–12:45, H 1012

Driving magnetization precession by dynamical compressive and shear strain in a low-symmetry metallic film — •Alexandra M. Kalashnikova¹, Tetiana L. Linnik², Vladimir N. Kats¹, Jasmin Jaeger³, Alexey S. Salasyuk¹, Dmitri R. Yakovlev³, Andrew W. Rushforth⁴, Andrey V. Akimov⁴, Manfred Bayer³, and Alexey V. Scherbakov^1,3 — ¹Ioffe Institute, St. Petersburg, Russia — ²Department of Theoretical Physics, V. E. Lashkaryov Institute of Semiconductor Physics, Kyiv, Ukraine — ³Experimentelle Physik 2, Technische Universität Dortmund, Dortmund, Germany — ⁴School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom

We report on manipulating magnetocrystalline anisotropy via inverse magnetostriction on a picosecond time scale in a low-symmetry film of a magnetic metallic alloy galfenol (Fe,Ga). Two approaches are emploied, injection of a picosecond strain pulse into the film, and generation of a dynamical strain of a complex temporal profile in the film directly. In both cases the ultrafast change of magnetic anisotropy triggers magnetization precession owing to the mixed, compressive and shear, character of the dynamical strain emerging in the low-symmetry metallic film.

When optically-generated strain emerges abruptly in the film and modifies its magnetic anisotropy, it competes with heat-induced change of anisotropy. We show that optically-generated strain remains efficient for launching magnetization precession, when the heat-induced changes of anisotropy parameters do not trigger the precession any more.