Aug 28 – 31, 2018
EPFL
Europe/Zurich timezone

【807】 Skyrmion formation in SRO-SIO epitaxial bilayer

Aug 29, 2018, 3:15 PM
15m
CE 1 (EPFL)

CE 1

EPFL

Talk Magnetism and Spintronics at the Nanoscale Magnetism and Spintronics at the Nanoscale

Speaker

Dr Mirko Bacani (Empa – Swiss Federal Labs for Materials Science and Technology)

Description

SrRuO3-SrIrO3 bilayers have recently attracted attention due to their topological Hall effect (THE) as an evidence of interfacial Dzyaloshinskii–Moriya interaction (DMI), which may lead to the formation of skyrmion phase. We measured THE in a SRO-SIO bilayer at different temperatures between 5K and 100K, and performed MFM in external fields. We observe maze pattern of up/down domains of ~70 nm in size. At various locations domains with the same magnetization touch each other and narrow 360° walls form, which indicates the presence of DMI. In external fields, domains shrink and skyrmions with a diameter of 10-20 nm appear. Our measurements prove that a strong THE can occur even though no skyrmion phase but solely individual skyrmions and bubble domains exist.

Primary author

Dr Mirko Bacani (Empa – Swiss Federal Labs for Materials Science and Technology)

Co-authors

Dr Andrada-Oana Mandru (Empa – Swiss Federal Labs for Materials Science and Technology) Keng-Yuan Meng (Department of Physics, The Ohio State University) Adam S. Ahmed (Department of Physics, The Ohio State University) Dr Xue Zhao (Empa – Swiss Federal Labs for Materials Science and Technology) Dr Marcos Penedo (Empa – Swiss Federal Labs for Materials Science and Technology) Dr Miguel A. Marioni (Empa – Swiss Federal Labs for Materials Science and Technology) Prof. Fengyuan Yang (Department of Physics, The Ohio State University) Prof. Hans J. Hug (Empa – Swiss Federal Labs for Materials Science and Technology)

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