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

Authors :
Althammer, Matthias
Singh, Amit Vikam
Keshavarz, Sahar
Yurtisigi, Mehmet Kenan
Mishra, Rohan
Borisevich, Albina
LeClair, Patrick
Gupta, Arunava
Publication Year :
2016

Abstract

We experimentally investigate the structural, magnetic and electrical transport properties of La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ based magnetic tunnel junctions with a SrSnO$_3$ barrier. Our results show that despite the large number of defects in the strontium stannate barrier, due to the large lattice mismatch, the observed tunnel magnetoresistance is comparable to tunnel junctions with a better lattice matched STiO$_3$ 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.

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1607.08393
Document Type :
Working Paper
Full Text :
https://doi.org/10.1063/1.4972103