Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4869400
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Funding
- Deutsche Forschungsgemeinschaft (DFG) within the Priority Program Spin Caloric Transport [RE1052/24-1]
- DFG [KU2321/2-1]
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
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We fabricated NiFe2O4 thin films on MgAl2O4 (001) substrates by reactive dc magnetron co-sputtering in a pure oxygen atmosphere at different substrate temperatures. The film properties were investigated by various techniques with a focus on their structure, surface topography, magnetic characteristics, and transport properties. Structural analysis revealed a good crystallization with epitaxial growth and low roughness and a similar quality as in films grown by pulsed laser deposition. Electrical conductivity measurements showed high room temperature resistivity (12 Omega m), but low activation energy, indicating an extrinsic transport mechanism. A band gap of about 1.55 eV was found by optical spectroscopy. Detailed x-ray spectroscopy studies confirmed the samples to be ferrimagnetic with fully compensated Fe moments. By comparison with multiplet calculations of the spectra, we found that the cation valencies are to a large extent Ni2+ and Fe3+. (C) 2014 AIP Publishing LLC.
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