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

Janda, T. and Roy, P.E. and Otxoa, R.M. and Soban, Z. and Ramsay, A. and Irvine, A.C. and Trojánek, F. and Surynek, M. and Campion, R.P. and Gallagher, B.L. and Němec, P. and Jungwirth, T. and Wunderlich, J. (2107) Inertial displacement of a domain wall excited by ultra-short circularly polarized laser pulses. Nature Communications, 8 . 15226/1-15226/7. ISSN 2041-1723

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Abstract

Domain wall motion driven by ultra-short laser pulses is a prerequisite 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 which only leads to a deformation of the internal domain wall structure. We show that subsequent depinning and micro-meter distance displacement without an applied magnetic field or any other external stimuli can only occur due to the inertia of the domain wall.

Item Type: Article
Keywords: Electronic and spintronic devices, Spintronics, Ultrafast photonics
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1038/ncomms15226
Depositing User: Gallagher, Bryan
Date Deposited: 21 Jul 2017 10:40
Last Modified: 18 Oct 2017 18:17
URI: http://eprints.nottingham.ac.uk/id/eprint/44289

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