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Unusual magnetic signal along SrTiO3 crystallographic directions
Yiftach Frenkel , Dennis V. christensen , Nini Pryds , Beena Kalisky
Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
Department of Energy Conversion and Storage, Technical University of Denmark, Risø Campus, DK-4000 Roskilde, Denmark
In this study we have used scanning Superconducting QUantum Interference Device (SQUID) to image SrTiO3 and SrTiO3 based interfaces (LaAlO3/SrTiO3 and gamma-Al2O3/SrTiO3). At 4 K we detected weak stripes of magnetic and susceptibility signals oriented along the SrTiO3 cubic crystallographic directions. These magnetic stripes sit along the channels of current flow previously reported by Kalisky et al. [1]. Surprisingly, we find that the magnetic modulations along these stripes become stronger at higher temperatures. These data can shed more light on the interplay between magnetism, superconductivity, polarity and structure at these complex interfaces.
References
1 Kalisky et al. Nat. Mat. 2013