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TT: Fachverband Tiefe Temperaturen

TT 39: Spin Structures/ Skyrmions (jointly with MA)

TT 39.3: Hauptvortrag

Mittwoch, 16. März 2011, 15:00–15:30, HSZ 04

Skyrmion states in noncentrosymmetric magnets — •Alexei N. Bogdanov, Andrei A. Leonov, and Ulrich K. Rößler — IFW Dresden

Axisymmetric magnetic strings with a fixed sense of rotation and nanometer sizes (chiral magnetic vortices or Skyrmions) have been predicted to exist in a large group of noncentrosymmetric crystals more than two decades ago [1]. Recently these extraordinary magnetic states have been directly observed in thin layers of cubic helimagnet (Fe,Co)Si [2]. In this report we apply our earlier theoretical findings and recent results [3] to review main properties of chiral Skyrmions, to elucidate their physical nature, and to analyse these recent experimental results on magnetic-field-driven evolution of Skyrmions and helicoids in chiral helimagnets. Concentrating on the physical side of the problem rather than on mathematical details we give an elementary introduction into the properties of chiral Skyrmions in magnetism. [1] A. N. Bogdanov, A. D. Yablonsky Sov. Phys. JETP 68 (1989) 101. [2] X. Z. Yu et al. Nature 465 (2010) 901. [3] U. K. Rößler et al., Nature 442 (2006) 797; arXiv:1009.4849; A. A. Leonov et al., arXiv:1001.1992v2.