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Hysteretic magnetoresistance (MR) is often used as a signature of ferromagnetism in conducting oxide films and heterostructures. Here, magnetotransport is investigated in a nonmagnetic La-doped SrSnO 3 film. A 12 nm La:SrSnO 3/2 nm SrSnO 3/GdScO 3 (110) film with insulating behavior exhibited a robust hysteresis loop in the MR at T < 5 K accompanied by an anomaly at ∼±3 T at T < 2.5 K. Furthermore, MR with the field in-plane yielded a value exceeding 100% at 1.8 K. Using detailed temperature-, angle- and magnetic field-dependent resistance measurements, we illustrate the origin of hysteresis is not due to magnetism in the film but rather is associated with the magnetocaloric effect of the substrate. Given GdScO 3 and similar substrates are commonly used, this work highlights the importance of thermal coupling to processes in the substrates which must be carefully accounted for in the data interpretation for heterostructures utilizing these substrates.
Bibliographical noteFunding Information:
The authors acknowledge Fengdeng Liu for the illustration of the Dynacool rotator puck. This work was supported primarily by the National Science Foundation (NSF) through the University of Minnesota MRSEC under Award Number DMR-2011401. Part of this work was supported through the Air Force Office of Scientific Research (AFOSR) through Grant No. FA9550-19-1-0245 and FA9550-21-1-0025 and through NSF DMR-1741801. Portions of this work were conducted in the Minnesota Nano Center, which is supported by the National Science Foundation (NSF) through the National Nano Coordinated Infrastructure Network (NNCI) under Award Number ECCS-1542202. Part of this work was also carried out in the College of Science and Engineering Characterization Facility, University of Minnesota, which has received capital equipment funding from the NSF through the UMN MRSEC program.
© 2021 American Chemical Society.
PubMed: MeSH publication types
- Journal Article
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- 2 Active
9/1/20 → 8/31/26
Project: Research project