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DF: Fachverband Dielektrische Festkörper
DF 8: Ferroics - Domains, Domain Walls and Skyrmions I
DF 8.1: Topical Talk
Tuesday, March 21, 2017, 09:30–10:00, WIL B321
Room temperature skyrmions and robust metastable skyrmion states in Co8Zn8Mn4 — •Jonathan White1, Kosuke Karube2, Nicole Reynolds1,3, Jorge Gavilano1, Hiroshi Oike2, Akiko Kikkawa2, Fumitaka Kagawa2, Yusuke Tokunaga4, Henrik Ronnow3, Yoshinori Tokura2,5, 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.