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

Matthias Althammer; Amit Vikam Singh; Sahar Keshavarz; Mehmet Kenan Yurtisigi; Rohan Mishra; Albina Y. Borisevich; Patrick Leclair; Arunava Gupta

doi:10.1063/1.4972103

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

Matthias Althammer, Amit Vikam Singh, Sahar Keshavarz, Mehmet Kenan Yurtisigi, Rohan Mishra, Albina Y. Borisevich, Patrick Leclair, Arunava Gupta

electron Microscopy and Microanalysis

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We experimentally investigate the structural, magnetic, and electrical transport properties of La0.67 Sr0.33MnO₃ based magnetic tunnel junctions with a SrSnO₃ 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 SrTiO₃ barrier, reaching values of up to 350% at T=5 K. 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>200 K. 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.

Original language	English
Article number	233903
Journal	Journal of Applied Physics
Volume	120
Issue number	23
DOIs	https://doi.org/10.1063/1.4972103
State	Published - Dec 21 2016

Funding

We gratefully acknowledge financial support via NSF-ECCS Grant No. 1509875. Work at ORNL was supported by the U.S. Department of Energy (DOE) Office of Science, Office of Basic Energy Sciences, Materials Science and Engineering Directorate.

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title = "Investigation of the tunnel magnetoresistance in junctions with a strontium stannate barrier",

abstract = "We experimentally investigate the structural, magnetic, and electrical transport properties of La0.67 Sr0.33MnO3 based magnetic tunnel junctions with a SrSnO3 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 SrTiO3 barrier, reaching values of up to 350% at T=5 K. 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>200 K. 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.",

author = "Matthias Althammer and {Vikam Singh}, Amit and Sahar Keshavarz and {Kenan Yurtisigi}, Mehmet and Rohan Mishra and Borisevich, {Albina Y.} and Patrick Leclair and Arunava Gupta",

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doi = "10.1063/1.4972103",

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T1 - Investigation of the tunnel magnetoresistance in junctions with a strontium stannate barrier

AU - Althammer, Matthias

AU - Vikam Singh, Amit

AU - Keshavarz, Sahar

AU - Kenan Yurtisigi, Mehmet

AU - Mishra, Rohan

AU - Borisevich, Albina Y.

AU - Leclair, Patrick

AU - Gupta, Arunava

PY - 2016/12/21

Y1 - 2016/12/21

N2 - We experimentally investigate the structural, magnetic, and electrical transport properties of La0.67 Sr0.33MnO3 based magnetic tunnel junctions with a SrSnO3 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 SrTiO3 barrier, reaching values of up to 350% at T=5 K. 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>200 K. 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.

AB - We experimentally investigate the structural, magnetic, and electrical transport properties of La0.67 Sr0.33MnO3 based magnetic tunnel junctions with a SrSnO3 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 SrTiO3 barrier, reaching values of up to 350% at T=5 K. 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>200 K. 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.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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

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