Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Skyrmions IV (joint session MA/TT)

TT 57.3: Vortrag

Donnerstag, 19. März 2020, 10:00–10:15, POT 6

Towards the 3D quantification of Skyrmions in thin helimagnets — •Sebastian Schneider1,2, Daniel Wolf1, Matthew J. Stolt3, Song Jin3, Marcus Schmidt4, Darius Pohl2,1, Bernd Rellinghaus2,1, Bernd Büchner1, Sebastian T. B. Goennenwein2, Kornelius Nielsch1, and Axel Lubk11IFW Dresden, Dresden, Germany — 2TU Dresden, Dresden, Germany — 3University of Wisconsin-Madison, Madison, USA — 4MPI CPfS, Dresden, Germany

The anticipated application of skyrmions as information carriers in magnetic thin film devices depends crucially on the stability and mobility of these solitons. Within the scope of this work the microscopic magnetic structure of skyrmions, which determines their transport properties, is investigated by means of magnetic measurement methods in transmission electron microscopy. To study the three-dimensional spin texture of Bloch skyrmions in thin helimagnets of FeGe and Fe0.95Co0.05Ge focal series electron holography and off-axis electron holography is employed to determine quantitative maps of the projected in-plane magnetic induction. Although these magnetic induction maps carry the clear signature of Bloch skyrmions, their magnitude is much smaller than the values expected for homogeneous skyrmions extending throughout the thickness of the film. Such a reduction can amongst others be caused by a modulation of the underlying spin textures along the out-of-plane z direction. To further analyse these modulations first electron holographic tomography experiments on Bloch skyrmions in an FeGe needle are performed.

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