Oberseminar Angewandte Analysis

Dienstag, 13.01.2015, 16.00 Uhr

Chiral skyrmions: rigorous solutions and physical applications

Prof. Dr. Alexei N. Bogdanov (Leibniz Institute for Solid State and Materials Research Dresden)

Abstract: Two dimensional chiral magnetic vortices or skyrmions represent
areas of reverse magnetization localized into tubes with the diameters of
nanoscale sizes. Importantly that in most of nonlinear physical systems such
multidimensional static solitonic states are unstable and collapse spontaneously
under the influence of external or internal perturbations. In condensed matter
systems lacking inversion symmetry two- and three-dimensional localized states
(skyrmions) are stabilized by a specific mechanism imposed by handedness
of the underlying structure [1]. This single out condensed matter systems with
intrinsic and induced chirality (noncentrosymetric magnetic crystals, multiferroics,
ferroelectrics, and liquid crystals) into a particular class of materials where
skyrmions can be induced and manipulated.
I overview theoretical results for isolated and embedded skyrmions arising in bulk
and confined magnetic materials with intrinsic and induced chirality [1-4].

[1] A. Bogdanov, A. Hubert. JMMM 138, 255 (1994); 195, 182 (1999).
[2] M. N. Wilson et al., PRB 89, 094411 (2014).
[3] F. N. Rybakov et al. Phys.Rev. B 87, 094424 (2013).
[4] S. A. Meynell et al., Phys.Rev. B 90, 014406 (2014).

Zeit: 16:00 Uhr

Ort: Seminarraum 001, Erdgeschoss, Pontdriesch 14-16, 52062 Aachen