Enhanced room-temperature magnetoresistance in La[sub 0.7]Sr[sub 0.3]MnO[sub 3]-glass composites

Gupta, S.; Ranjit, R.; Mitra, C.; Raychaudhuri, P.; Pinto, R.
January 2001
Applied Physics Letters;1/15/2001, Vol. 78 Issue 3, p362
Academic Journal
In this letter, we report the improved magnetotransport properties of La[sub 0.7]Sr[sub 0.3]MnO[sub 3]-borosilicate glass composite with different weight percents of glass. All the composites showed ferromagnetic nature at room temperature. The microstructure of these composites was seen using a scanning electron microscope. The microstructure was reconfirmed using spot energy dispersive x-ray analysis. We observe an enhancement of the low-field magnetoresistance (<200 Oe) at room temperature for the optimal composition of 25 wt % of glass. It is argued that glass layer separating the grain boundaries may be acting as barrier for spin-polarized tunneling, thereby enhancing the low-field magnetoresistance. © 2001 American Institute of Physics.


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