Exploring possible ferromagnetism of the interface
Abstract
We report on extensive investigations of magnetism at the n-type LaAlO3/SrTiO3 interface performed by utilizing a spectrum of local and integrative analytical techniques: Scanning superconducting quantum interference device microscopy, polar Kerr magnetometry, ferromagnetic resonance, and magnetic torque magnetometry. The samples originated from the same wafers. For nominally fully oxidized samples, we find that the mere presence of the conducting interface does not induce magnetism to values exceeding already present magnetic signals originating from the substrates, irrespective of the measurement technique. With the controlled introduction of oxygen vacancies, however, the different analytical techniques with their inherently different sensitivities and potential interactions with possible magnetic moments in the samples yield different results concerning the existence of magnetism. These unexpected differences obtained with the various measurement techniques are a possible source of the disagreement in the literature about the existence of ferromagnetism at LaAlO3/SrTiO3 interfaces.
- Authors:
-
[1];
[2];
- Max Planck Inst. for Solid State Research, Stuttgart (Germany)
- Univ. of Michigan, Ann Arbor, MI (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Tbilisi State Univ. (Georgia)
- Univ. of California, Irvine, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Natural Sciences and Engineering Research Council of Canada (NSERC); Shota Rustavely National Science Foundation of Georgia; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1596969
- Alternate Identifier(s):
- OSTI ID: 1649779
- Grant/Contract Number:
- SC0008110; AC02-76SF00515; FR 17_325; DMR-1807817; Univ. of Michigan, Ann Arbor, MI (United States)
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 10; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Magnetism; oxide interface; complex oxides; interfaces; SQUID; two-dimensional electron system; AC susceptibility measurements; annealing; atomic force microscopy; DC susceptibility measurements; epitaxy; ferromagnetic resonance; laser ablation; laser annealing; magneto-optical Kerr effect; resistivity measurements; magnetism
Citation Formats
Wittlich, P., Boschker, H., Asaba, T., Li, L., Noad, H. M. L., Watson, C. A., Moler, K. A., Daraselia, D., Japaridze, D., Shengelaya, A., Wang, J., Xia, J., and Mannhart, J. Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.104418.
Wittlich, P., Boschker, H., Asaba, T., Li, L., Noad, H. M. L., Watson, C. A., Moler, K. A., Daraselia, D., Japaridze, D., Shengelaya, A., Wang, J., Xia, J., & Mannhart, J. Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface. United States. https://doi.org/10.1103/PhysRevMaterials.3.104418
Wittlich, P., Boschker, H., Asaba, T., Li, L., Noad, H. M. L., Watson, C. A., Moler, K. A., Daraselia, D., Japaridze, D., Shengelaya, A., Wang, J., Xia, J., and Mannhart, J. Tue .
"Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface". United States. https://doi.org/10.1103/PhysRevMaterials.3.104418. https://www.osti.gov/servlets/purl/1596969.
@article{osti_1596969,
title = {Exploring possible ferromagnetism of the LaAlO3/SrTiO3 interface},
author = {Wittlich, P. and Boschker, H. and Asaba, T. and Li, L. and Noad, H. M. L. and Watson, C. A. and Moler, K. A. and Daraselia, D. and Japaridze, D. and Shengelaya, A. and Wang, J. and Xia, J. and Mannhart, J.},
abstractNote = {We report on extensive investigations of magnetism at the n-type LaAlO3/SrTiO3 interface performed by utilizing a spectrum of local and integrative analytical techniques: Scanning superconducting quantum interference device microscopy, polar Kerr magnetometry, ferromagnetic resonance, and magnetic torque magnetometry. The samples originated from the same wafers. For nominally fully oxidized samples, we find that the mere presence of the conducting interface does not induce magnetism to values exceeding already present magnetic signals originating from the substrates, irrespective of the measurement technique. With the controlled introduction of oxygen vacancies, however, the different analytical techniques with their inherently different sensitivities and potential interactions with possible magnetic moments in the samples yield different results concerning the existence of magnetism. These unexpected differences obtained with the various measurement techniques are a possible source of the disagreement in the literature about the existence of ferromagnetism at LaAlO3/SrTiO3 interfaces.},
doi = {10.1103/PhysRevMaterials.3.104418},
journal = {Physical Review Materials},
number = 10,
volume = 3,
place = {United States},
year = {Tue Oct 22 00:00:00 EDT 2019},
month = {Tue Oct 22 00:00:00 EDT 2019}
}
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