Physical characteristics and cation distribution of NiFe2O4 thin films with high resistivity prepared by reactive co-sputtering
Autor(en): | Klewe, C. Meinert, M. Boehnke, A. Kuepper, K. Arenholz, E. Gupta, A. Schmalhorst, J. -M. Kuschel, T. Reiss, G. |
Stichwörter: | CONDUCTIVITY; FERRITE; MAGNETIC-BEHAVIOR; NI-2P; NICKEL; Physics; Physics, Applied; SPINEL | Erscheinungsdatum: | 2014 | Herausgeber: | AMER INST PHYSICS | Journal: | JOURNAL OF APPLIED PHYSICS | Volumen: | 115 | Ausgabe: | 12 | Zusammenfassung: | 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. |
ISSN: | 00218979 | DOI: | 10.1063/1.4869400 |
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geprüft am 12.05.2024