物性セミナー/2015-12-3

2015年 冬学期 第5回 物性セミナー

 講師 Prof. Alexei N. Bogdanov* (Center for Chiral Science, Hiroshima University)

 題目 Introduction into physics of chiral skyrmions: theoretical results and experimental observations

 日時 2015年 12月 3日(木) 午後4時50分　いつもと曜日が異なります

 場所 16号館 827

アブストラクト

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 [1,2]. 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 basic results on experimental observations and theoretical description of isolated and embedded skyrmions arising in bulk and confined  magnetic materials with intrinsic and induced chirality [3-7].

[1] A. N. Bogdanov, D. A. Yablonskii. Sov. Phys. JETP 68, 101 (1989).

[2] A. Bogdanov, A. Hubert. JMMM 138, 255 (1994); 195, 182 (1999).

[3] X. Z. Yu et al. Nature, 465, 901 (2010), PRB, 91, 054411 (2015).

[4] N. Romming et al. Science 341, 636 (2013), PRL, 114, 177203 (2015).

[5] M. N. Wilson et al., PRB 89, 094411 (2014).

[6] S. A. Meynell et al., PRB 90, 014406 (2014).

[7] A. O. Leonov et al. ArXiv: 1508.02155

• On leave of Leibniz Institute for Solid State and Materials Research, Dresden, Germany

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