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Title: Room temperature ferromagnetism in conducting α-(In{sub 1−x}Fe{sub x}){sub 2}O{sub 3} alloy films

We have studied electronic transport and magnetic properties of α-(In{sub 1−x}Fe{sub x}){sub 2}O{sub 3} alloy films. Temperature dependence of resistivity of the films showed semiconducting behavior of conductivity. Room temperature ferromagnetism was observed. Relatively high coercive fields indicated that observed ferromagnetism in α-(In{sub 1−x}Fe{sub x}){sub 2}O{sub 3} films were not arisen from magnetic metallic iron nano-precipitates. Remanence measurement revealed the Curie temperature of 520 K and 620 K for α-(In{sub 0.52}Fe{sub 0.48}){sub 2}O{sub 3} and α-(In{sub 0.23}Fe{sub 0.77}){sub 2}O{sub 3} films, corresponding to a weakening of superexchange interactions in these alloys (with less magnetic iron cations) with respect to canted antiferromagnet α-Fe{sub 2}O{sub 3}. Nevertheless, Curie temperatures remain much higher than 300 K, and semiconducting behavior with low activation energy in resistivity for middle composition alloy, exhibiting combined multi-functionality of room ferromagnetism and semiconducting properties, in corundum alloys such as α-(Ga{sub 1−x}Fe{sub x}){sub 2}O{sub 3} or α-Fe{sub 2−x}Ti{sub x}O{sub 3}.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3]
  1. Photonics and Electronics Science and Engineering Center, Kyoto University, 6158520 Kyoto (Japan)
  2. (Japan)
  3. Groupe d'Etudes de la Matière Condensée (GEMaC), Université de Versailles St Quentin en Yvelines - CNRS, 78035 Versailles (France)
Publication Date:
OSTI Identifier:
22412615
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; ANTIFERROMAGNETISM; CATIONS; COERCIVE FORCE; CONCENTRATION RATIO; CORUNDUM; CURIE POINT; FERRITES; FERROMAGNETISM; FILMS; INDIUM COMPOUNDS; MAGNETIC PROPERTIES; PRECIPITATION; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K