Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 39.1: Invited Talk

Wednesday, March 16, 2011, 14:00–14:30, HSZ 04

Skyrmion crystals and topological transport phenomena — •Yoshinori Tokura — Department of Applied Physics, University of Tokyo, Tokyo, Japan

A class of helimagnet is derived from the Dzyaloshinskii-Moriya(DM) interaction on a non-centrosymmetric crystal; prototypical examples are the B20 type (FeSi type) transition-metal silicide and germanide families. Recently, the Skrymion lattice was confirmed to form in a narrow temperature(T) -magnetic field(B) region near the hlimagnetic to paramagnetic transition boundary. By contrast, thin films of B20 type MSi (M=Mn or Fe1-xCox ) or MGe (M=Mn, Fe), whose thickness is smaller than the helical spin modulation period (=10-100nm), ubiquitously form the two-dimensional (2D) Skyrmion crystal with magnetic fields (B) applied normal to the film plane over a wide T-B region. The implication of such a 2D Skyrmion crystal in the magneto-transport properties is discussed, such as the spin-chirality- induced topological Hall effect.

This work was done in collaboration with X.Z. Yu, N. Kanazawa, Y. Onose, Y. Shiomi, Y. Matsui, N. Nagaosa, J.H. Park, J.H. Han, K. Kimoto, W.Z. Zhang, T. Arima, S. Wakimoto, K. Ohoyama, and K. Kakurai