Abstract
In this paper, we report the enhancement of the low field magnetoresistance in Sr2FeMoO6-glass composites with different wt% percents of glass. The crystal structure of Sr2FeMoO6 does not change by adding glass, and the glass is most likely located at the grain boundaries. The low field magnetoresistance up to 1T of Sr2FeMoO6-glass composites at 10K all shows obvious butterfly-shaped field dependence other than the pure Sr2FeMoO6 bulk sample. The magnetoresistance of Sr2FeMoO6-glass composites at 10K is enhanced gradually with increasing the glass concentration and reaches 39% with a wt% of 50%. The enhancement of low field magnetoresistance in Sr2FeMoO6-glass composites can be well explained by the spin-dependent tunneling at the glass boundaries, and it also allowed us to conclude that the spin polarization of Sr2FeMoO6 is at least 80% at low temperature.
Highlights
Intense research activities have been focused on the halfmetallic double perovskite Sr2FeMoO6 ͑SFMOin recent years, because the high value of spin polarization and the high Curie temperature of 420 K in this compound make it an ideal candidate for both technological applications and scientific investigation
The LFMR value of SFMO-glass composites can be enhanced after the glass addition and it increases with increasing content of glass
Scanning electron micrographs show that the SFMO grains are randomly distributed and the glass is most likely located at the grain boundaries
Summary
Intense research activities have been focused on the halfmetallic double perovskite Sr2FeMoO6 ͑SFMOin recent years, because the high value of spin polarization and the high Curie temperature of 420 K in this compound make it an ideal candidate for both technological applications and scientific investigation. MRLFMRvalues in single crystal and single crystalline thin films because the large LFMR of SFMO polycrystalline sample is due to the spin-dependent electron transfer across the grain boundaries.. A large LFMR can be obtained by modulating the grain boundary in SFMO. Gupta et al reported on enhanced MR in. La0.7Sr0.3MnO3-glass composites, which was attributed to the presence of a glass layer at the grain boundaries in the composites.. There are few reports about SFMO using this strategy to enhance the LFMR. ThePb– Si– Bglass with lower soft temperature can be dispersed into the grain boundaries at high temperature and become a good insulating layer that can improve the spin-dependent electron tunneling. The LFMR value of SFMO-glass composites can be enhanced after the glass addition and it increases with increasing content of glass
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