Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV
DF 17.3: Vortrag
Donnerstag, 23. März 2017, 10:15–10:30, WIL B321
Searching for prospective multiferroic compounds hosting skyrmion lattices — •Erik Neuber1, Peter Milde1, Istvan Kézsmárki2, and Lukas Eng1 — 1Institut für Angewandte Physik, TU Dresden, D-01069 Dresden, Germany — 2Dep. of Physics, Budapest Univ. of Technol. and Econ. and MTA-BME Lendület Magneto-optical Spectroscopy Research Group, 1111 Budapest, Hungary
Following earlier predictions, skyrmion lattices (SkL), i.e. non-collinear periodic arrays of (chiral) spin vortices, are now reported to exist in various magnetic crystals of mostly chiral structure [1]. Nevertheless, also non-chiral but polar materials possessing the Cnv symmetry have been identified as ideal SkL-supporting hosts. GaV4S8 (GVS), a multiferroic polar magnetic semiconductor with rhombohedral (C3v) symmetry, constitutes the first such candidate that has thoroughly been investigated [2]. GVS not only shows easy axis anisotropy that firmly pins SkL vortices even under external magnetic fields, but, furthermore, surprises with an unusally-broad temperature range that exhibits SkL ordering. Motivated by this great success, more such unusual SkL-materials with multiferroic properties must exist, even in the family of lacunar spinels [3]. In this contribution, we will briefly review on the real-space exploitation of such SkLs in GVS by scanning probe techniques, and report on our fascinating search for further such materials exhibiting a similar behavior to GVS.
[1] P. Milde et al., Science 340, 1076 (2013). [2] I. Kézsmárki et al., Nat. Mater. 14, 1116 (2015). [3] H.-S. Kim et al., Nat. Commun. 5, 3988 (2014).