Double perovskite Sr2FeMoO6/ZnxFe1−xFe2O4 (SFMO/ZFO) composite systems with varying zinc content in nanosized zinc ferrite were synthesized. Composites have been prepared by two phase sintering process of limited intermixing of the SFMO calcined powder and ZFO nanoparticles. The structural analysis confirms the coexistence of both the phases in the composites and revealed that the agglomerated ZFO nanoparticles segregated at the grain boundaries. It was found that the inclusion of low ZFO content (2 wt. %) increases the resistivity, magnetization, and low field magnetoresistance (LFMR), whereas it further decreases with increasing ZFO content. A large room-temperature tunnelling magnetoresistance (Δρ/ρ0) ratio 4.83% and 6.90% was observed for pristine SFMO and SFMO/ZFO (x = 0.7) composite samples respectively at low magnetic field of 2 kOe, which is 1.42 times larger than pure SFMO sample. The enhanced LFMR is highly desirable for room temperature magneto resistive applications.
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7 August 2013
Research Article|
August 02 2013
Room temperature low field magnetoresistance in Sr2FeMoO6/ZnxFe1−xFe2O4 composites
Nitu Kumar;
Nitu Kumar
a)
1
National Physical Laboratory
, Dr. K. S. Krishnan Marg, New Delhi 110012, India
2
Department of Physics, National Institute of Technology
, Kurukshetra 136119, India
3
Speclab, University of Puerto Rico
, San Juan, Puerto Rico 00931, USA
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Geetika Khurana;
Geetika Khurana
3
Speclab, University of Puerto Rico
, San Juan, Puerto Rico 00931, USA
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Anurag Gaur;
Anurag Gaur
a)
2
Department of Physics, National Institute of Technology
, Kurukshetra 136119, India
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R. K. Kotnala
R. K. Kotnala
a)
1
National Physical Laboratory
, Dr. K. S. Krishnan Marg, New Delhi 110012, India
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a)
Authors to whom correspondence should be addressed. Electronic addresses: chauhannitu@gmail.com, anuragdph@gmail.com, and rkkotnala@gmail.com
J. Appl. Phys. 114, 053902 (2013)
Article history
Received:
March 27 2013
Accepted:
July 15 2013
Citation
Nitu Kumar, Geetika Khurana, Anurag Gaur, R. K. Kotnala; Room temperature low field magnetoresistance in Sr2FeMoO6/ZnxFe1−xFe2O4 composites. J. Appl. Phys. 7 August 2013; 114 (5): 053902. https://doi.org/10.1063/1.4817024
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