Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics

Ilya Razdolski (), Alexandr Alekhin, Nikita Ilin, Jan P. Meyburg, Vladimir Roddatis, Detlef Diesing, Uwe Bovensiepen and Alexey Melnikov ()
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Ilya Razdolski: Fritz Haber Institute of Max Planck Society
Alexandr Alekhin: Fritz Haber Institute of Max Planck Society
Nikita Ilin: Fritz Haber Institute of Max Planck Society
Jan P. Meyburg: Faculty of Chemistry, University of Duisburg-Essen
Vladimir Roddatis: Universität Göttingen, Institut für Materialphysik
Detlef Diesing: Faculty of Chemistry, University of Duisburg-Essen
Uwe Bovensiepen: Faculty of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen
Alexey Melnikov: Fritz Haber Institute of Max Planck Society

Nature Communications, 2017, vol. 8, issue 1, 1-5

Abstract: Abstract Spintronics had a widespread impact over the past decades due to transferring information by spin rather than electric currents. Its further development requires miniaturization and reduction of characteristic timescales of spin dynamics combining the sub-nanometre spatial and femtosecond temporal ranges. These demands shift the focus of interest towards the fundamental open question of the interaction of femtosecond spin current (SC) pulses with a ferromagnet (FM). The spatio-temporal properties of the impulsive spin transfer torque exerted by ultrashort SC pulses on the FM open the time domain for probing non-uniform magnetization dynamics. Here we employ laser-generated ultrashort SC pulses for driving ultrafast spin dynamics in FM and analysing its transient local source. Transverse spins injected into FM excite inhomogeneous high-frequency spin dynamics up to 0.6 THz, indicating that the perturbation of the FM magnetization is confined to 2 nm.

Date: 2017
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DOI: 10.1038/ncomms15007

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