Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 69: Correlated Electrons: Spin Systems and Itinerant Magnets - Chiral Magnets
TT 69.2: Vortrag
Mittwoch, 2. April 2014, 15:15–15:30, HSZ 204
Small Angle Neutron Scattering of the Skyrmion Lattice Decay in Chiral Magnets — •Jonas Kindervater1, Alfonso Chacon1, Andreas Bauer1, Sebastian Mühlbauer2, and Christian Pfleiderer1 — 1Physik-Department E21, Technische Universität München, Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany
Skyrmion lattices in chiral magnets differ from conventional magnetic order in terms of their non-trivial topology. In turn the phase transition between conventional magnetic order and the skyrmion lattice phase is always first order. An open question concerns thereby the specific microscopic mechanisms by which this first order phase transition takes place, i.e., by which the non-trivial topology unwinds. Using small angle neutron scattering we report detailed measurements of the time-dependence of the skyrmion lattice decay in Fe1−xCoxSi after quenching the skyrmion lattice phase into a metastable state. As our main result we find pronounced differences for the decay into the helical and the conical phase as a function of temperature and magnetic field. We discuss our results in the context of recent magnetic force magnetometry of the skyrmion lattice to helical transition in the same material under similar conditions [1].