Giant positive magnetoresistance in Fe doped In2O3 and InREO3 (RE=Eu,Nd) composites

G. Peleckis, University of Wollongong
X. L. Wang, University of Wollongong
S. X. Dou, University of Wollongong
P. Munroe, University of New South Wales
J. Ding, Platforms Sciences Laboratory, Victoria
B. Lee, Platforms Sciences Laboratory, Victoria

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This article was originally published as Peleckis, G, Wang, XL, Dou, SX, Munroe, P, Ding, J and Lee, B, Giant positive magnetoresistance in Fe doped In2O3 and InREO3 (RE=Eu,Nd) composites, Journal of Applied Physics, 103, 2008, 07D113-1-07D113-3. Copyright American Institute of Physics 2008. Original journal article available here

Abstract

Synthesis and characterization of Fe and rare earth (RE) (RE=Eu,Nd) codoped bulk In₂O₃ oxide are reported. Composites consisting of Fe-doped In₂O₃ and InREO₃ phases were formed, as determined by x-ray diffraction and transmission electron microscopy, with particle sizes of 50–120 nm. The composites exhibit superparamagnetic and semiconducting behavior. A giant positive magnetoresistance is observed at low temperatures, reaching 81% and 50% at 5 K in Eu–Fe and Nd–Fe codoped samples, respectively.