Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 14.4: Vortrag

Montag, 16. März 2015, 10:15–10:30, EB 301

Magnetic skyrmions stabilized at zero field — •Nikolai S. Kiselev¹, Ashis K. Nandy¹, Changhoon Heo², Theo Rathing², and Stefan Blügel¹ — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ²Institute of Molecules and Materials, Radboud University Nijmegen, 6525 AJ Nijmegen, Netherlands

Magnetic skyrmions may appear as a metastable state in thin magnetic layers at zero magnetic field within certain range of Dzyaloshinskii-Moriya interaction and the uniaxial anisotropy. We present a comprehensive theoretical study of the statics and dynamics of such skyrmions. Important feature of this solution is a coexistence of two type of skyrmion solutions characterized by opposite polarity and opposite topological charge. We consider such skyrmions as a conceptually new approaches in data storage where switching between two of such skyrmion states is provided by sort magnetic field pulse. We discuss complex mechanism of such switching. The role of field pulse duration, damping, size and shape of host system are discussed in details. Our results are based on stochastic spin dynamics simulation applied to an extended Heisenberg model for different type of crystal lattices.