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TT: Fachverband Tiefe Temperaturen

TT 14: Surface Magnetism – Skyrmions (jointly with MA, O)

TT 14.2: Vortrag

Montag, 16. März 2015, 09:45–10:00, EB 301

Interlayer Exchange Coupling: A route to stabilize skyrmions in magnetic multilayers — •Ashis K. Nandy, Nikolai S. Kiselev, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Magnetic skyrmion is a topologically nontrivial spin texture with particle like properties, which may emerge quite generally under an applied magnetic field of appropriate strength in any magnetic thin layer or multilayer with surface or interface induced Dzyaloshinskii-Moriya interaction (DMI). DMI chooses chirality i.e. the proper sense of rotation of spins [1]. However, the required magnetic field to stabilize skyrmions can be excessively large. We present a multiscale approach based on DFT calculations and atomistic spin-dynamic simulations, which allows us to stabilize skyrmions in magnetic multilayers even at zero magnetic field. It is based on fine tuning the interplay between internal and interfaces induced interactions by adjusting the thicknesses and interface compositions of multilayers. Our approach predicts the existence of a skyrmion lattice as well as isolated skyrmions in a thin film of a transition-metal monolayer grown on a heavy metal substrate. The simulated skyrmions exhibit high stability in an applied magnetic field and temperature. We provide a description for the complex phases occurring in such systems and present a magnetic phase diagram for a prototype example of Mn/W(001).
[1] M. Bode et al., Nature 447, 190 (2007).