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| Magneto-transport Properties of La0.7Sr0.3Mn1+dO3-Manganese Oxide Composites Prepared by Liquid Phase Sintering |
| Journal of Magnetics, Volume 19, Number 3, 30 Sep 2014, Pages 221-226 |
Hyo-Jin Kim (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University), Jae-Hyoung You (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University), Soon-Mi Choi (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University), Sang-Im Yoo *  (Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University) |
| Abstract |
Significantly enhanced low-field magnetoresistance (LFMR) and maximum dMR/dH {(dMR/dH)max} values were successfully achieved from La0.7Sr0.3MnO3(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– xMn2O3 (x = 0.1, 0.2, 0.3, 0.4, and 0.8) were sintered at 1450°C, above the eutectic temperature of 1430°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.
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| Keywords: perovskite manganite; LFMR (low field magnetoresistance); magnetotransport property |
| DOI: http://dx.doi.org/10.4283/JMAG.2014.19.3.221 |
| Full Text: PDF |
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