Magnetoresistance Intensification of Fe3O4/BaTiO3 Nanoparticle-Composite-Sinter Produced by Low Temperature Heat Treatment

We have presented the study on the magnetoresistance intensification of (Fe 3 O 4 ) 1− X /(BaTiO 3 ) X nanoparticle-composite-sinter (NPCS) produced by low temperature heat treatment. The average sizes of α -Fe 2 O 3 and BaTiO 3 nanoparticles are 30 nm and 40 nm, respectively. They were homogeneousl...

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Bibliographic Details
Published in:Journal of superconductivity and novel magnetism 2012-12, Vol.25 (8), p.2809-2812
Main Authors: Kobori, H., Uzimoto, K., Hoshino, A., Yamasaki, A., Sugimura, A., Taniguchi, T., Horie, T., Naitoh, Y., Shimizu, T.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductivity phenomena in semiconductors and insulators
Cross-disciplinary physics: materials science
rheology
Electronic transport in condensed matter
Exact sciences and technology
Magnetic Materials
Magnetic properties and materials
Magnetic properties of nanostructures
Magnetism
Materials science
Mobility edges
hopping transport
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Original Paper
Physics
Physics and Astronomy
Strongly Correlated Systems
Superconductivity
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Summary:We have presented the study on the magnetoresistance intensification of (Fe 3 O 4 ) 1− X /(BaTiO 3 ) X nanoparticle-composite-sinter (NPCS) produced by low temperature heat treatment. The average sizes of α -Fe 2 O 3 and BaTiO 3 nanoparticles are 30 nm and 40 nm, respectively. They were homogeneously mixed together and were sintered at 500 °C for 3 hours in the atmosphere of Ar(90%)/H 2 (10%). X  of (Fe 3 O 4 ) 1− X /(BaTiO 3 ) X NPCS was varied between 0 and 0.75. With increasing  X , the electrical resistivity (ER) increases and shows the Mott’s variable-range-hopping (VRH) conduction behavior in a wide temperature region. The negative differential magnetoresistivity (ND-MR) is observed for all samples in a moderately high magnetic field region. In a low magnetic field region, the MR shows a large hysteresis. As X increases, the variation of the MR is intensified. We consider that the total number of network channels of the electrical conduction is reduced and the spin scattering is consequently intensified.
ISSN:1557-1939
1557-1947
DOI:10.1007/s10948-011-1271-9