Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Skyrmions III (joint session MA/TT)

TT 45.11: Vortrag

Mittwoch, 18. März 2020, 17:45–18:00, POT 6

Real-Space Imaging of the low-temperature Skyrmion phase in Cu2OSeO3 by Magnetic-Force-Microscopy — •Gerald Malsch1, Peter Milde1,2, Dmytro Ivaneiko1, Christian Pfleiderer3, Helmuth Berger4, and Lukas Eng1,21Institute of Applied Physic, TU Dresden, 01187 Dresden, Germany — 2ct.qmat: Würzburg-Dresden Cluster of Excellence - EXC 2147, TU Dresden, Germany — 3Physik-Department, Technische Universität München, D-85748 Garching, Germany — 4Institut de Physique de la Matière Complexe, EPFL, 1015 Lausanne, Switzerland

Both small-angle neutron scattering measurements (SANS) and theoretical calculations indicate that there might exist additional skyrmion phases in Cu2OSeO3 in addition to its high-temperature phase, found at very low temperatures (LT) and only for magnetic fields applied along the <100> direction. These phases are usually hidden beneath a metastable tilted conical phase, but can be revealed by modulating the applied magnetic field.

Here we present a Magnetic-Force-Microscopy (MFM) analysis monitoring this LT skyrmion phase in real space. We find the LT skyrmion lattice to nucleate in micrometer-sized domains that coexist with tilted conical domains during the annealing process. Moreover, individual skyrmion domains are rotated relative to each other, resulting exactly in the ring-shaped halo as measured by SANS or REXS on a multidomain Cu2OSeO3 crystal.

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