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http://dx.doi.org/10.4283/JMAG.2014.19.3.221

Magneto-transport Properties of La0.7Sr0.3Mn1+dO3-Manganese Oxide Composites Prepared by Liquid Phase Sintering  

Kim, Hyo-Jin (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)
You, Jae-Hyoung (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)
Choi, Soon-Mi (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)
Yoo, Sang-Im (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University)
Publication Information
Journal of Magnetics / v.19, no.3, 2014 , pp. 221-226 More about this Journal
Abstract
Significantly enhanced low-field magnetoresistance (LFMR) and maximum dMR/dH {$(dMR/dH)_{max}$} values were successfully achieved from $La_{0.7}Sr_{0.3}MnO_3$(LSMO)-manganese oxide composite samples prepared by liquid phase sintering, compared with those of the same composites prepared by solid state reaction. For this study, pure LSMO and LSMO-manganese oxide composites with various nominal compositions of (1-x)LSMO-$xMn_2O_3$ (x = 0.1, 0.2, 0.3, 0.4, and 0.8) were sintered at $1450^{\circ}C$, above the eutectic temperature of $1430^{\circ}C$, for 1 h in air. The highest LFMR value of 1.28% with the highest $(dMR/dH)_{max}$ value of 21.1% $kOe^{-1}$ was obtained from the composite sample with x = 0.3 at 290 K in 500 Oe. This enhancement of LFMR and $(dMR/dH)_{max}$ values is ascribed to efficient suppression of magnetic disorder at the LSMO grain boundary, by forming a characteristic LSMO-manganese eutectic structure.
Keywords
perovskite manganite; LFMR (low field magnetoresistance); magnetotransport property;
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