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Microwave resonant and zero-field absorption study of pure and doped ferrite nanoparticles |
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| Authors: | GV Kurlyandskaya SM Bhagat JC Aphesteguy |
| Institution: | a FMR Group, Department of Physics, University of Maryland, 2221 Physics Bldg, College Park, MD 20742, USA b Universidad del País Vasco, Dpto. Electricidad y Electrónica, P.O. Box 644, E-48080 Bilbao, Spain c LAFMACEL, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850 (1063), Buenos Aires, Argentina d Ural State University, Department of Magnetism and Magnetic Nanomaterials, Lenin Ave. 51, Ekaterinburg 620083, Russia e Institute of Metal Physics UD RAS, Kovalevskaya 18, GSP-170, Ekaterinburg 620041, Russia |
| Abstract: | Microwave absorption was studied for magnetic nanoparticles of Fe3O4 (A) prepared by co-precipitation and Ni0.35Cu0.15Zn0.5Fe2O4 (B) nanoparticles prepared by the sol-gel combustion method at different temperature. In all cases only one ferromagnetic resonance line was observed which indicated that the materials were magnetically uniform. The linewidths were large mainly because of the wide variations in particle sizes, shapes and orientations. As expected, A type nanoparticles showed no absorption at zero-field. However, B type nanoparticles exhibited a sizable loss at a zero-field and the effect increases with the increase of reaction temperature. Mechanical crushing of the sample further enhanced the absorption. |
| Keywords: | A: Magnetic materials B: Chemical synthesis |
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