Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Surface Magnetism – Skyrmions (jointly with MA, O)
TT 14.6: Talk
Monday, March 16, 2015, 11:00–11:15, EB 301
Advanced characterization of helical spin structures and domains in Skyrmion systems — •Peggy Schönherr1, Antoine Dussaux1, Naoya Kanazawa2, Yoshinori Tokura2, Christian Degen1, Manfred Fiebig1, and Dennis Meier1 — 1ETH Zürich, 8093 Zürich, Switzerland — 2University of Tokyo, 113-8656 Tokyo, Japan
Magnetic whirls, so-called Skyrmions, emerge in various chiral magnets and attract tremendous attention due to their exotic properties. Skyrmions can, e.g., be moved at ultra-low current densities and give rise to the topological Hall Effect. Much less is known about the magnetic phases that surround the Skyrmion state, including fundamental aspects such as the domain formation and spin-defect interactions. The fragmented knowledge is partially due to the challenging experimental access and the general difficulty to image antiferromagnetic order at the nanoscale. Here, we show how helical magnetic structures in the Skyrmion system FeGe emerge and transform as a function of temperature and magnetic field. We discuss the magnetic field-driven response of multi-domain states, the influence of defects, as well as fingerprints of spontaneous jump-like movements of the periodic spin arrangement. The results are gained near room temperature using magnetic force microscopy (MFM) and diamond nitrogen-vacancy center microscopy. Besides providing new insight to the physics of Skyrmion materials, our results foreshadow a promising pathway for measuring complex spin textures with high spatial and temporal resolution.