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| Enhanced Low-field Magnetoresistance of La0.7Sr0.3Mn1+dO3-Mn3O4 Composite Films Prepared by ex-situ Solid Phase Crystallization |
| Journal of Magnetics, Volume 17, Number 4, 31 Dec 2012, Pages 265-270 |
Young-Min Kang (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM)), Hyo-Jin Kim (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM)), Sang-Im Yoo *  (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM)) |
| Abstract |
We report improved low-field magnetoresistance (LFMR) effects of the La0.7Sr0.3Mn1+dO3-Mn3O4 composite films with the nominal composition of La0.7Sr0.3MnO3(LSMO)-50 mol% Mn3O4. The composite films were fabricated by ex-situ solid phase crystallization (SPC) of amorphous films at the annealing temperature region of 900-1100oC for 2 h in a pure oxygen atmosphere. The amorphous films were deposited on polycrystalline BaZrO3 (poly-BZO) substrates by dc-magnetron sputtering at room temperature. The Curie temperatures (TC) of all composite films were insignificantly altered in the range of 368-372 K. The highest LFMR value of 1.29 % in 0.5 kOe with the maximum dMR/dH value of 37.4%kOe−1 at 300 K was obtained from 900 nm-thick composite film annealed at 1100oC. The improved LFMR properties of the composite films are attributed to effective spin-dependent scattering at the La0.7Sr0.3Mn1+dO3 grain boundaries sharpened by adjacent chemically compatible Mn3O4 grains.
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| Keywords: low-field magnetoresistance (LFMR); La0.7Sr0.3MnO3 (LSMO)-Mn3O4 composite film; dc-magnetron sputtering; solid phase crystallization; spin-dependent scattering |
| DOI: http://dx.doi.org/10.4283/JMAG.2012.17.4.265 |
| Full Text: PDF |
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