Kumar, Nitu and Misra, P. and Kotnala, R. K. and Gaur, Anurag and Katiyar, R. S. (2014) Room temperature magnetoresistance in Sr2FeMoO6/SrTiO3/Sr2FeMoO6 trilayer devices. Journal of Physics D: Applied Physics, 47 (6). 065006-1-065006-5. ISSN 0022-3727

PDF - Published Version Restricted to Registered users only Download (587Kb) | Request a copy

Abstract

We report the room temperature magnetoresistance in Sr2FeMoO6 based magnetic tunnel junctions (MTJs). The micrometre-sized (SFMO/STO/SFMO) devices were grown by pulse laser deposition. The crystal structure and phase purity of SFMO layers were examined by X-ray diffraction, which shows the single phase formation of ordered polycrystalline SFMO thin film without any impurity phases. The FESEM micrograph clearly shows the presence of an ultrathin STO barrier layer. The magnetization measurements show the good ferromagnetic loop behaviour and Curie temperature (TC) well above 375 K, which indicate fairly high-quality growth of SFMO thin films. The current-voltage curve of the MTJ devices at room temperature exhibited nonlinear and asymmetric behaviour in agreement with the predictions of tunnel conductance. The observed large tunnelling magnetoresistance (TMR similar to 7%) at room temperature was attributed to spin-dependent tunnelling across a uniform ultrathin STO tunnel barrier sandwiched between two identical SFMO (bottom and top) electrodes in MTJ devices.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S IOP Publishing.
Uncontrolled Keywords:	double perovskite, magnetic tunnel junctions, magnetoresistance
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	04 Nov 2015 10:28
Last Modified:	04 Nov 2015 10:28
URI:	http://npl.csircentral.net/id/eprint/1506

Actions (login required)

View Item