Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Skyrmions (jointly with MA, O) (joint session TT/MA)

MA 17.6: Vortrag

Montag, 16. März 2020, 17:30–17:45, HSZ 304

Distribution of energy barriers associated with magnetic skyrmion decay in Fe0.5Co0.5Si — •Alfonso Chacon1, Marco Halder1, Jonas Kindervater1, Andreas Bauer1, Sebastian Mühlbauer2, Achim Rosch3, and Christian Pfleiderer11Physik Department, Technische Universität München, Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 3Institut für Theoretische Physik, Universität zu Köln, Köln, Germany

We report comprehensive measurements of the magnetization and small-angle neutron scattering of the time-dependence of the decay of metastable skyrmion lattice order in Fe0.5Co0.5Si after field cooling. Comparison of the SANS intensity pattern with the magnetization allows to identify contributions in the magnetization that are due to skyrmions only. Combining first-order reversal behaviour with the time dependence under carefully selected conditions, justifies the application of time versus temperature superposition and infer the distribution of energy barriers associated with the decay of magnetic skyrmions. The resulting distribution of energy barriers allows to discriminate between contributions due to the non-trivial topology and defect- and disorder-related pinning.

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