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Title: Investigation of the tunnel magnetoresistance in junctions with a strontium stannate barrier

In this paper, we experimentally investigate the structural, magnetic, and electrical transport properties of La 0.67 Sr 0.33MnO 3 based magnetic tunnel junctions with a SrSnO 3 barrier. Our results show that despite the high density of defects in the strontium stannate barrier, due to the large lattice mismatch, the observed tunnel magnetoresistance (TMR) is comparable to tunnel junctions with a better lattice matched SrTiO 3 barrier, reaching values of up to 350% at T = 5K. Further analysis of the current-voltage characteristics of the junction and the bias voltage dependence of the observed tunnel magnetoresistance show a decrease of the TMR with increasing bias voltage. In addition, the observed TMR vanishes for T > 200K. Finally, our results suggest that by employing a better lattice matched ferromagnetic electrode, and thus reducing the structural defects in the strontium stannate barrier, even larger TMR ratios might be possible in the future.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [7] ;  [4] ;  [3]
  1. Univ. of Alabama, Tuscaloosa, AL (United States). MINT Center
  2. (BADW), Garching (Germany). Walther-Meissner Inst.
  3. Univ. of Alabama, Tuscaloosa, AL (United States). MINT Center. Dept. of Chemistry and Chemical Engineering
  4. Univ. of Alabama, Tuscaloosa, AL (United States). MINT Center. Dept. of Physics and Astronomy
  5. Washington Univ., St. Louis, MO (United States). Dept. of Mechanical Engineering and Materials Science
  6. (ORNL), Oak Ridge, TN (United States). Materials Sciences and Technology Division
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Sciences and Technology Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; 1509875
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 23; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Contributing Orgs:
Bavarian Academy of Sciences and Humanities (BADW), Garching (Germany); Washington Univ., St. Louis, MO (United States)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; magnetic tunnel junctions; electrodes; magnetoresistance; multilayers; magnetic fields
OSTI Identifier:
1340473