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X-Ray Study of Skyrmion Lattices – Microscopic Properties, 3D Structure, and Dynamics

Date
Jan 28, 2020
Time
2:50 PM - 4:20 PM
Speaker
Prof. Thorsten Hesjedal
Affiliation
University of Oxford
Series
TUD Physik-IFMP Institutsseminar
Language
en
Main Topic
Physik
Other Topics
Physik
Description

Abstract:



Magnetic skyrmions in noncentrosymmetric chiral magnets form ordered lattices with a periodicity ranging from 3-100 nm. This lengthscale lends itself to soft x-ray scattering experiments owing to the large resonant scattering cross-section for 3d elements, the excellent reciprocal space resolution, as well as the tunable surface sensitivity. We will present an overview of the capabilities of resonant elastic x-ray scattering (REXS) for the study of magnetic skyrmions [1], highlighting the following effects:




  • Microscopic skyrmion properties [2]: By exploiting the polarization dependence of REXS, the exact surface helicity angles of twisted skyrmions for both left- and right-handed chiral bulk Cu2OSeO3 was determined.

  • Full 3D spin structure of skyrmions [3]: Using polarization-dependent REXS we found a continuous transformation of the skyrmion tubes from pure Néel-twisting at the surface to pure Bloch-twisting in the bulk over a distance of several hundred nanometers.

  • Rotating lattices [4]: In a magnetic field gradient, skyrmions undergo rotation with well-defined dynamics. This provides an effective way of controlling skyrmions in racetrack memory schemes.



[1]    S. L. Zhang et al., Phys. Rev. B 93, 214420 (2016); DOI: 10.1103/PhysRevB.93.214420; S. L. Zhang et al., Nat. Commun. 8, 14619 (2017); DOI: 10.1038/ncomms14619

[2]    S. L. Zhang et al., Phys. Rev. Lett. 120, 227202 (2018); DOI: 10.1103/PhysRevLett.120.227202

[3]    S. L. Zhang et al., Proc. Natl. Acad. Sci. U.S.A. (2018), DOI: 10.1073/pnas.1803367115

[4]     S. L. Zhang et al., Nat. Commun. 9, 2115 (2018); DOI: 10.1038/s41467-018-04563-4

Links

Last modified: Jan 28, 2020, 12:10:09 AM

Location

TUD (C213)- 01069Dresden
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https://tu-dresden.de/tu-dresden/campus/orientierung/lageplaene

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TU Dresden, Faculty of Science, Department of PhysicsHaeckelstraße301069Dresden
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+49 351 463-33378
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E-Mail
TUD Physik
Homepage
http://tu-dresden.de/die_tu_dresden/fakultaeten/fakultaet_mathematik_und_naturwissenschaften/fachrichtung_physik
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