Interfacial oxygen-octahedral-tilting-driven electrically tunable topological Hall effect in ultrathin SrRuO3 films

Youdi Gu, Yi Wen Wei, Kun Xu, Hongrui Zhang, Fei Wang, Fan Li, Muhammad Shahrukh Saleem, Cui Zu Chang, Jirong Sun, Cheng Song, Ji Feng, Xiaoyan Zhong, Wei Liu, Zhidong Zhang, Jing Zhu, Feng Pan

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Topological spin textures as an emerging class of topological matter offer a medium for information storage and processing. The recently discovered topological Hall effect (THE) is considered as a fingerprint for electrically probing the Dzyaloshinskii-Moriya (DM) interaction and corresponding non-trivial spin-textures. In this paper, the THE and its electrical control are observed in ultrathin (8 unit cells. u.c.) 4D ferromagnetic SrRuO3 films grown on SrTiO3(0 0 1) substrates, indicating the existence of gate-bias-tunable DM interaction in the single SrRuO3 layer without contacting 5D oxide SrIrO3 layer. High-resolution lattice structure analysis revealed that the interfacial RuO6 octahedral tilting induced by local orthorhombic-to-tetragonal structural phase transition exists across the SrRuO3/SrTiO3 interface, which naturally breaks the inversion symmetry. Our theoretical calculations demonstrate that the DM interaction arises owing to the broken inversion symmetry and strong spin-orbit interaction of 4D SrRuO3. This interfacial RuO6 octahedral tilting-induced DM interaction can stabilize the Néel-type magnetic skyrmions, which in turn accounts for the observed THE in transport. Besides the fundamental significance, the understanding of THE in oxides and its electrical manipulation presented in this work could advance the low power cost topological electronic and spintronic applications.

Original languageEnglish (US)
Article number404001
JournalJournal of Physics D: Applied Physics
Volume52
Issue number40
DOIs
StatePublished - Jul 25 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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    Gu, Y., Wei, Y. W., Xu, K., Zhang, H., Wang, F., Li, F., Saleem, M. S., Chang, C. Z., Sun, J., Song, C., Feng, J., Zhong, X., Liu, W., Zhang, Z., Zhu, J., & Pan, F. (2019). Interfacial oxygen-octahedral-tilting-driven electrically tunable topological Hall effect in ultrathin SrRuO3 films. Journal of Physics D: Applied Physics, 52(40), [404001]. https://doi.org/10.1088/1361-6463/ab2fe8