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Title: Evolution of ferromagnetism in two-dimensional electron gas of LaTiO 3 /SrTiO 3

Abstract

Understanding, creating, and manipulating spin polarization of two-dimensional electron gases at complex oxide interfaces present an experimental challenge. For example, despite almost a decade long research effort, the microscopic origin of ferromagnetism in LaAlO3/SrTiO3 heterojunctions is still an open question. Here, by using a prototypical two-dimensional electron gas (2DEG) which emerges at the interface between band insulator SrTiO3 and antiferromagnetic Mott insulator LaTiO3, the experiment reveals the evidence for magnetic phase separation in a hole-doped Ti d1 t2g system, resulting in spin-polarized 2DEG. The details of electronic and magnetic properties of the 2DEG were investigated by temperature-dependent d.c. transport, angle-dependent X-ray photoemission spectroscopy, and temperature-dependent magnetoresistance. The observation of clear hysteresis in magnetotransport at low magnetic fields implies spin-polarization from magnetic islands in the hole rich LaTiO3 near the interface. These findings emphasize the role of magnetic instabilities in doped Mott insulators, thus providing another path for designing all-oxide structures relevant to spintronic applications.

Authors:
ORCiD logo [1];  [2];  [1]; ORCiD logo [1];  [3];  [1];  [1]
  1. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA; Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China
  3. Department of Physics, Indian Institute of Science, Bangalore 560012, India
Publication Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540140
Alternate Identifier(s):
OSTI ID: 1427322
Grant/Contract Number:  
SC0012375
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 12; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Wen, Fangdi, Cao, Yanwei, Liu, Xiaoran, Pal, B., Middey, S., Kareev, M., and Chakhalian, J. Evolution of ferromagnetism in two-dimensional electron gas of LaTiO 3 /SrTiO 3. United States: N. p., 2018. Web. doi:10.1063/1.5009768.
Wen, Fangdi, Cao, Yanwei, Liu, Xiaoran, Pal, B., Middey, S., Kareev, M., & Chakhalian, J. Evolution of ferromagnetism in two-dimensional electron gas of LaTiO 3 /SrTiO 3. United States. doi:10.1063/1.5009768.
Wen, Fangdi, Cao, Yanwei, Liu, Xiaoran, Pal, B., Middey, S., Kareev, M., and Chakhalian, J. Mon . "Evolution of ferromagnetism in two-dimensional electron gas of LaTiO 3 /SrTiO 3". United States. doi:10.1063/1.5009768. https://www.osti.gov/servlets/purl/1540140.
@article{osti_1540140,
title = {Evolution of ferromagnetism in two-dimensional electron gas of LaTiO 3 /SrTiO 3},
author = {Wen, Fangdi and Cao, Yanwei and Liu, Xiaoran and Pal, B. and Middey, S. and Kareev, M. and Chakhalian, J.},
abstractNote = {Understanding, creating, and manipulating spin polarization of two-dimensional electron gases at complex oxide interfaces present an experimental challenge. For example, despite almost a decade long research effort, the microscopic origin of ferromagnetism in LaAlO3/SrTiO3 heterojunctions is still an open question. Here, by using a prototypical two-dimensional electron gas (2DEG) which emerges at the interface between band insulator SrTiO3 and antiferromagnetic Mott insulator LaTiO3, the experiment reveals the evidence for magnetic phase separation in a hole-doped Ti d1 t2g system, resulting in spin-polarized 2DEG. The details of electronic and magnetic properties of the 2DEG were investigated by temperature-dependent d.c. transport, angle-dependent X-ray photoemission spectroscopy, and temperature-dependent magnetoresistance. The observation of clear hysteresis in magnetotransport at low magnetic fields implies spin-polarization from magnetic islands in the hole rich LaTiO3 near the interface. These findings emphasize the role of magnetic instabilities in doped Mott insulators, thus providing another path for designing all-oxide structures relevant to spintronic applications.},
doi = {10.1063/1.5009768},
journal = {Applied Physics Letters},
number = 12,
volume = 112,
place = {United States},
year = {2018},
month = {3}
}

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Works referenced in this record:

Oxide Interfaces--An Opportunity for Electronics
journal, March 2010


Magnetic effects at the interface between non-magnetic oxides
journal, June 2007

  • Brinkman, A.; Huijben, M.; van Zalk, M.
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  • DOI: 10.1038/nmat1931

Coexistence of Superconductivity and Ferromagnetism in Two Dimensions
journal, July 2011