Inertial displacement of a domain wall excited by ultra-short circularly polarized laser pulses.

Autor:	Janda T; Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic.; Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic., Roy PE; Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK., Otxoa RM; Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK., Šobáň Z; Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic., Ramsay A; Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK., Irvine AC; Microelectronics Research Center, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK., Trojanek F; Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic., Surýnek M; Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic., Campion RP; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Gallagher BL; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Němec P; Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic., Jungwirth T; Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic.; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Wunderlich J; Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6, Czech Republic.; Hitachi Cambridge Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2017 May 17; Vol. 8, pp. 15226. Date of Electronic Publication: 2017 May 17.
DOI:	10.1038/ncomms15226
Abstrakt:	Domain wall motion driven by ultra-short laser pulses is a pre-requisite for envisaged low-power spintronics combining storage of information in magnetoelectronic devices with high speed and long distance transmission of information encoded in circularly polarized light. Here we demonstrate the conversion of the circular polarization of incident femtosecond laser pulses into inertial displacement of a domain wall in a ferromagnetic semiconductor. In our study, we combine electrical measurements and magneto-optical imaging of the domain wall displacement with micromagnetic simulations. The optical spin-transfer torque acts over a picosecond recombination time of the spin-polarized photo-carriers that only leads to a deformation of the initial domain wall structure. We show that subsequent depinning and micrometre-distance displacement without an applied magnetic field or any other external stimuli can only occur due to the inertia of the domain wall.
Databáze:	MEDLINE
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