Regensburg 2019 – wissenschaftliches Programm
MA 7.9: Vortrag
Montag, 1. April 2019, 17:30–17:45, H37
LTEM and DPC measurements on room temperature magnetic skyrmions in Pt/Co/W multilayers — •S. Pöllath3, T. Lin1, H. Liu2, Y. Zhang4, B. Ji1, N. Lei1, J. J. Yun5, L. Xi5, D. Z. Yang5, Z. Xing1, Z. L. Wang1, L. Sun2, Y. Z. Wu2, L. F. Yin2, W. B. Wang2, J. Shen2, J. Zweck3, C. H. Back6, Y. G. Zhang1, and Q. S. Zhao1 — 1Beihang University, Beijing 100191, China — 2Fudan University, Shanghai 200433, China — 3Universität Regensburg, Regensburg 93040, Germany — 4Chinese Academy of Sciences, Beijing 100190, China — 5School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China — 6Technische Universität München, Garching 85748, Germany
In this work, measurements on Pt/Co/W multilayer systems using Transmission Electron Microscopy (TEM) in Lorentz (LTEM) and Differential Phase Contrast (DPC) mode are reported. In LTEM, the contrast mechanism of the Neel-type skyrmions is analyzed and used to estimate the skyrmion size with LTEM image contrast simulations. Phase diagrams are recorded showing the wide range of the skyrmion phase pocket in temperature. History dependent phase diagrams reveal that the thermodynamical existence of the observed skyrmions is rather allowed by the topological remnants of the stripe domains, than by a real thermodynamic phase. Further it is shown how DPC can be used to measure the skyrmion size in-focus.