期刊
CROATICA CHEMICA ACTA
卷 88, 期 4, 页码 -出版社
CROATIAN CHEMICAL SOC
DOI: 10.5562/cca2752
关键词
cobalt ferrite; oxide spinels; pulsed laser deposition; Mossbauer spectroscopy
资金
- Spanish Ministry of Economy and Competitiveness (MINECO) [MAT2012-38045-C04-01, CTQ2013-43086-P, MAT2013-48009-C4-1-P]
- EU-FP7 NANOPYME Project [310516]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- FPI from the MINECO [BES-2013-063396]
We have studied the magnetic properties and the composition of cobalt ferrite single crystal films on SrTiO3: Nb grown by infrared pulsed-laser deposition. Mossbauer spectra have been recorded from both the target used to grow the films and the films themselves. The MOssbauer spectra of the target taken at low temperatures show a strong dependence of the recoil free fraction of the octahedral sites with temperature. The films composition, with a coexistence of Co-enriched cobalt ferrite and magnetite, has been estimated assuming a similar ratio of the recoil free fractions of the films. X-ray absorption and x-ray magnetic circular dichroism measurements confirm the valence composition of the film and show ferromagnetic Fe-Co coupling in the films with a coercive field around 0.5 T at room temperature. The combination of these characterization techniques allows establishing the coherent structural and magnetic properties of this biphase system.
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