Linear colossal magnetoresistance and magnetic textures in LaTiO3 thin films on SrTiO3

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Teresa Tschirner - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Berengar Leikert - , University of Würzburg (Author)
  • Felix Kern - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Daniel Wolf - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Axel Lubk - , CEOS- Endowed Chair of Electron Optics (with IFW), Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Martin Kamp - , University of Würzburg (Author)
  • Kirill Miller - , University of Würzburg (Author)
  • Fabian Hartmann - , University of Würzburg (Author)
  • Sven Höfling - , University of Würzburg (Author)
  • Judith Gabel - , Diamond Light Source (Author)
  • Matthias Schmitt - , Diamond Light Source (Author)
  • Martin Stübinger - , University of Würzburg (Author)
  • Julia Küspert - , University of Würzburg (Author)
  • Tien Lin Lee - , Diamond Light Source (Author)
  • Bernd Büchner - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Joseph Dufouleur - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Marc Gabay - , Paris-Sud University (Author)
  • Michael Sing - , University of Würzburg (Author)
  • Ralph Claessen - , University of Würzburg (Author)
  • Louis Veyrat - , Leibniz Institute for Solid State and Materials Research Dresden, University of Würzburg (Author)

Abstract

Linear magnetoresistance (LMR) is of particular interest for memory, electronics, and sensing applications, especially when it does not saturate over a wide range of magnetic fields. Structural disorder, however, also tends to limit the mobility and hence the overall LMR amplitude. An alternative route to achieve large LMR is via nonstructural inhomogeneities which do not affect the zero field mobility, like magnetic domains. Here, we report a colossal positive linear magnetoresistance in LaTiO3/SrTiO3 heterostructures, with amplitude up to 6500% at 9T at low temperature. The colossal amplitude of the LMR, one of the largest in oxide heterostructure, stems from the unusual combination of a very high heterostructure mobility, up to 40 000 cm2V-1s-1, and a very large coverage of low-mobility regions. Low-temperature Lorentz transmission electron microscopy measurements further reveals a striped magnetic structure at the sub-μm scale in the LaTiO3 layer, compatible with in-plane spiral magnetism, with very high surface coverage. We propose that the low-mobility regions and striped magnetic regions are correlated, we model the increase in scattering induced by the magnetic texture, and we show that the non saturating LMR fits the Parish-Littlewood scenario. Our results provide a novel route for the engineering of large-LMR systems, using magnetic texture.

Details

Original languageEnglish
Article number245405
Number of pages14
JournalPhysical Review B
Volume108
Issue number24
Publication statusPublished - 15 Dec 2023
Peer-reviewedYes