Hysteretic magnetoresistance in superconducting SrTiO3/LaAlO3/SrTiO3 trilayer interface system

Yongsu Kwak, Woojoo Han, Nam Hee Kim, Myung Ho Bae, Mahn Soo Choi, Myung Hwa Jung, Yong Joo Doh, Joon Sung Lee, Jonghyun Song, Jinhee Kim

Research output: Contribution to journalArticlepeer-review

Abstract

We investigated the electrical transport properties of the SrTiO3/LaAlO3/SrTiO3 (STO/LAO/STO) trilayer interface system. We found that the trilayer exhibits superconductivity at temperatures below 0.2 K. In the superconducting regime, the magnetoresistance (MR) of the system shows pronounced hysteresis, possibly due to the interplay of ferromagnetism and superconductivity. The magnitude of MR hysteresis strongly depends on the magnetic field sweep rate, and we observed a threshold field-sweep rate below which no MR is detected. At high sweep rates, the MR exhibits superconducting-normal-superconducting transition behavior. To explain these observations, we propose a model based on the ohmic heating from superconducting phase slip centers beneath Bloch-type magnetic domain walls in the ferromagnetic layer. Furthermore, we observed complex features in the MR curves that are likely due to domain wall motion in the system.

Original languageEnglish
Pages (from-to)104-109
Number of pages6
JournalCurrent Applied Physics
Volume53
DOIs
Publication statusPublished - 2023 Sept

Bibliographical note

Funding Information:
This work was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) ( P0008458 , HRD Program for Industrial Innovation), Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2020R1A6A1A03047771 , NRF-2016R1A5A1008184 , NRF-2021R1A2C3012612 ), NRF funded by the Ministry of Science and ICT (No. 2022M3H4A1A04074153 , 2020R1A2C1011000 , 2018R1A3B1052827 , 2020R1A2C3008044 ), and Electronics and Telecommunications Research Institute (ETRI) grant funded by the Korean government ( 22YB1500 ).

Publisher Copyright:
© 2023

Keywords

  • Ferromagnetism
  • LaAlO/SrTiO
  • Magnetoresistance
  • Phase slip center
  • SrTiO3/LaAlO3/SrTiO
  • Superconductivity

ASJC Scopus subject areas

  • General Materials Science
  • General Physics and Astronomy

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