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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 Fe_0.5Co_0.5Si — •Alfonso Chacon¹, Marco Halder¹, Jonas Kindervater¹, Andreas Bauer¹, Sebastian Mühlbauer², Achim Rosch³, and Christian Pfleiderer¹ — ¹Physik 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 Fe_0.5Co_0.5Si 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.