Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Focus Session: Magnetic Correlations in Mesoscopic Spin Structures

MA 32.2: Hauptvortrag

Mittwoch, 22. März 2017, 10:00–10:30, HSZ 01

Stability of interfacial Skyrmions, Solitons and Bound Monopoles: How to store Energy in topological magnetic Quasiparticles. — •Elena Vedmedenko — University of Hamburg, Germany

One of the most exciting recent developments in nanomagnetism concerns topologically non-trivial magnetic configurations acting as quasiparticles. Among these quasiparticle excitations are three- or two-dimensional magnetic skyrmions, one-dimensional topological helices and zero-dimensional monopoles, which can also be bound by one-dimensional Dirac strings. Once created, magnetic quasiparticles can only be erased with effort from a surface. This makes them valuable for the application in future data storage devices but also poses fundamental questions on the microscopic reasons for the topological stability. Here, analytical and numerical analyses are used to study the dynamics and life-times of skyrmions, topological helices and bound monopoles in continuous and structured magnetic thin films. Additional attention is paid to the interaction between magnetic quasiparticles. It is shown that the main reason for the enhanced stability is a dynamical behavior of an energy barrier rather than its height. Interactions between quasiparticles, e.g. in spin-ices, are defined by the characteristic tension-to-mass ratio proportional to the fine structure constant and lattice parameters. On the basis of this analysis, a theoretical concept of the energy storage at the nanoscale is proposed and compared with recent experiments.