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http://dx.doi.org/10.4283/JMAG.2012.17.4.265

Enhanced Low-field Magnetoresistance of La0.7Sr0.3Mn1+dO3-Mn3O4 Composite Films Prepared by ex-situ Solid Phase Crystallization  

Kang, Young-Min (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM))
Kim, Hyo-Jin (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM))
Yoo, Sang-Im (Department of Materials Science and Engineering, Seoul National University, Research Institute of Advanced Materials (RIAM))
Publication Information
Journal of Magnetics / v.17, no.4, 2012 , pp. 265-270 More about this Journal
Abstract
We report improved low-field magnetoresistance (LFMR) effects of the $La_{0.7}Sr_{0.3}Mn_{1+d}O_3-Mn_3O_4$ composite films with the nominal composition of $La_{0.7}Sr_{0.3}MnO_3$(LSMO)-50 mol% $Mn_3O_4$. The composite films were fabricated by ex-situ solid phase crystallization (SPC) of amorphous films at the annealing temperature region of $900-1100^{\circ}C$ for 2 h in a pure oxygen atmosphere. The amorphous films were deposited on polycrystalline $BaZrO_3$ (poly-BZO) substrates by dc-magnetron sputtering at room temperature. The Curie temperatures ($T_C$) 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 $1100^{\circ}C$. The improved LFMR properties of the composite films are attributed to effective spin-dependent scattering at the $La_{0.7}Sr_{0.3}Mn_{1+d}O_3$ grain boundaries sharpened by adjacent chemically compatible $Mn_3O_4$ grains.
Keywords
low-field magnetoresistance (LFMR); $La_{0.7}Sr_{0.3}MnO_3$ (LSMO)-$Mn_3O_4$ composite film; dc-magnetron sputtering; solid phase crystallization; spin-dependent scattering;
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