A study of the magnetic properties of mixed ferrite nanoparticles in ferrofluids
| Autor: | K. Mazeika, D. Baltrunas, P.C. Fannin, Yu. D. Perfiliev, A. Amulevicius |
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| Rok vydání: | 2007 |
| Předmět: |
Ferrofluid
Materials science Condensed matter physics Nanoparticle Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Freezing point Magnetic field Paramagnetism Magnetic anisotropy Materials Chemistry Physical and Theoretical Chemistry Hyperfine structure Spectroscopy Superparamagnetism |
| Zdroj: | Journal of Molecular Liquids. 133:152-158 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2006.08.061 |
| Popis: | Magnetic properties of ZnxCo1−xFe2O4 (x = 0.3, 0.5 and 0.7) nanoparticles in ferrofluids have been investigated by means of Mossbauer spectroscopy in the temperature range 4.2–300 K. The mean sizes of the particles were 10.2, 7.4 and 5.2 nm, respectively. The transition temperatures to the superparamagnetic state and values of crystal magnetic anisotropy have been evaluated. The transition to the superparamagnetic state was observed at temperatures below the freezing point of the carrier liquid for the 5.2 nm and 7.4 nm particles and above its freezing point for the 10.2 nm particles. A multi-level model is used in the analysis of the Mossbauer spectra and in the calculation of the hyperfine magnetic field. |
| Databáze: | OpenAIRE |
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