Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Ferroics - Domains, Domain Walls and Skyrmions I

MA 25.1: Topical Talk

Dienstag, 21. März 2017, 09:30–10:00, WIL B321

Room temperature skyrmions and robust metastable skyrmion states in Co₈Zn₈Mn₄ — •Jonathan White¹, Kosuke Karube², Nicole Reynolds^1,3, Jorge Gavilano¹, Hiroshi Oike², Akiko Kikkawa², Fumitaka Kagawa², Yusuke Tokunaga⁴, Henrik Ronnow³, Yoshinori Tokura^2,5, and Yasujiro Taguchi² — ¹Paul Scherrer Institut, Switzerland — ²RIKEN CEMS, Wako, Japan — ³EPFL, Switzerland — ⁴Department of Advanced Materials Science, University of Tokyo, Japan — ⁵Department of Applied Physics, University of Tokyo, Japan

Magnetic skyrmions are being intensely studied in various non-centrosymmetric magnets. Among them, the chiral cubic magnets are well-known to host a hexagonal skyrmion lattice as a thermodynamic equilibrium state. However, this state exists only over a narrow temperature and magnetic field region just below the magnetic transition temperature. Using both ac susceptibility and neutron scattering, we study metastable Skyrmion states in the room-temperature skyrmion host material Co₈Zn₈Mn₄. These states, created by a conventional field-cooling through the equilibrium skyrmion state, survive over the major part of the phase diagram, including down to zero temperature and up to the critical magnetic-field of the ferromagnetic transition. Furthermore, the metastable skyrmion lattice is observed to transform between conventional hexagonal and a novel square-like coordinations upon varying the temperature and magnetic field. These findings exemplify the topological robustness of the once-created skyrmions, and establish metastable states as a promising technological platform.