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Title: Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions

Abstract

The conducting interface formed between LaAlO{sub 3} and SrTiO{sub 3} exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO{sub 3}/SrTiO{sub 3} heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO{sub 3} barrier.

Authors:
 [1];  [2];  [3]; ; ;  [1];  [4];  [5];  [2];  [6];  [2]
  1. Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)
  2. SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025 (United States)
  3. (Japan)
  4. (United States)
  5. Department of Physics, Stanford University, Stanford, California 94305 (United States)
  6. (United Kingdom)
Publication Date:
OSTI Identifier:
22311148
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; CARRIER DENSITY; ELECTRON MOBILITY; HETEROJUNCTIONS; LANTHANUM COMPOUNDS; LIFETIME; MAGNETORESISTANCE; MODULATION; SPIN; STRONTIUM TITANATES

Citation Formats

Swartz, Adrian G., E-mail: aswartz@stanford.edu, Harashima, Satoshi, Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Xie, Yanwu, Kim, Bongju, Hwang, Harold Y., SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, Lu, Di, Bell, Christopher, Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, and Hikita, Yasuyuki. Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions. United States: N. p., 2014. Web. doi:10.1063/1.4891174.
Swartz, Adrian G., E-mail: aswartz@stanford.edu, Harashima, Satoshi, Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Xie, Yanwu, Kim, Bongju, Hwang, Harold Y., SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, Lu, Di, Bell, Christopher, Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, & Hikita, Yasuyuki. Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions. United States. doi:10.1063/1.4891174.
Swartz, Adrian G., E-mail: aswartz@stanford.edu, Harashima, Satoshi, Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Xie, Yanwu, Kim, Bongju, Hwang, Harold Y., SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025, Lu, Di, Bell, Christopher, Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, and Hikita, Yasuyuki. Mon . "Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions". United States. doi:10.1063/1.4891174.
@article{osti_22311148,
title = {Spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions},
author = {Swartz, Adrian G., E-mail: aswartz@stanford.edu and Harashima, Satoshi and Department of Applied Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656 and Xie, Yanwu and Kim, Bongju and Hwang, Harold Y. and SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, Menlo Park, California 94025 and Lu, Di and Bell, Christopher and Department of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL and Hikita, Yasuyuki},
abstractNote = {The conducting interface formed between LaAlO{sub 3} and SrTiO{sub 3} exhibits high electron mobility, tunable carrier densities, and is theoretically predicted to have long spin lifetimes. Thus, the LaAlO{sub 3}/SrTiO{sub 3} heterostructure is a promising system for the transportation of spin information. We have investigated spin-dependent transport across Co/LaAlO{sub 3}/SrTiO{sub 3} heterostructures using an all electrical three terminal geometry and observed Lorentzian magnetoresistance typically associated with Hanle spin dephasing. However, such a picture fails to explain all the experimentally observed behavior. Further, experiments with spin-unpolarized Au/LaAlO{sub 3}/SrTiO{sub 3} heterojunctions support an alternative scenario involving current modulation by spin-dependent transport through defect states in the LaAlO{sub 3} barrier.},
doi = {10.1063/1.4891174},
journal = {Applied Physics Letters},
number = 3,
volume = 105,
place = {United States},
year = {Mon Jul 21 00:00:00 EDT 2014},
month = {Mon Jul 21 00:00:00 EDT 2014}
}