TY - JOUR
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
N1 - Publisher Copyright:
© 2016 Author(s).
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.
UR - https://www.scopus.com/pages/publications/85006741802
U2 - 10.1063/1.4972103
DO - 10.1063/1.4972103
M3 - Article
AN - SCOPUS:85006741802
SN - 0021-8979
VL - 120
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 23
M1 - 233903
ER -