Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Skyrmions I (joint session MA/TT)

TT 25.10: Vortrag

Dienstag, 17. März 2020, 12:15–12:30, POT 6

B20-type MnSi films on Si (111) grown by flash lamp annealing — •Zichao Li1,2, Yufang Xie1,2, Viktor Begeza1,2, Ye Yuan1,3, Lars Rebohle1, Manfred Helm1,2, Kornelius Nielsch2,4, Slawomir Prucnal1, and Shengqiang Zhou11Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, D-01328 Dresden, Germany — 2Technische Universität Dresden, D-01062 Dresden, Germany — 3Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China — 4Institute for Metallic Materials, IFW-Dresden, Dresden, 01069, Germany

B20-type MnSi is one of the noncentrosymmetric materials hosting magnetic skyrmions, which are promising information carriers in spintronic devices. In this work, we report the preparation of (111)-textured MnSi films on Si substrates. The preparation method only includes the deposition of Mn layers at room temperature and a following process by flash lamp at milli-second. By controlling the thickness of Mn layers and flash energy, we can obtain pure MnSi or mixtures of MnSi and MnSi1.7. Surprisingly, all prepared films show Curie temperatures around 41 K, which is much higher than for bulk MnSi or films reported previously. Magnetic skyrmions are stabilized at the whole temperature range below 41 K and under a much wider magnetic-field range. We speculate that the increased Curie temperature is due to the strain in the MnSi films arising from the MnSi1.7 phase or from the substrate. Our work calls a re-examination of the structural and magnetic properties of B20 MnSi films.

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