Berlin 2018 – scientific programme
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AKjDPG: Arbeitskreis junge DPG
AKjDPG 3: PhD Symposium: Ultrafast spin-lattice interactions (joint session MA/AKjDPG)
AKjDPG 3.6: Invited Talk
Tuesday, March 13, 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. Scherbakov1,3 — 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.