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FORC analysis of Ni(SiO2) nanogranular film in the blocked regime |
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| Authors: | R Lavín C Farías JC Denardin |
| Institution: | 1. Departamento de Física, Universidad de Santiago de Chile, USACH, Av. Ecuador 3493, Santiago, Chile;2. Facultad de Ingeniería, Universidad Diego Portales, UDP, Ejército 441, Santiago, Chile;3. Centro para el Desarrollo de la Nanociencia y la Nanotecnología, CEDENNA, Av. Ecuador 3493, Santiago, Chile |
| Abstract: | In this work the magnetic and structural properties of granular Ni(SiO2) films are studied by means of FORCs diagrams and microscopy. Transmission electron microscopy images show that the sample is composed of a fine dispersion of Ni nanoparticles with 3.7 nm in average sizes. Magnetic measurements as function of temperature show that the nanoparticles are superparamagnetic at room temperature and are blocked at 5 K. The FORCs diagrams obtained below the blocking temperature allow us to determine the average size of the nanoparticles and the distribution of sizes in a very good agreement with TEM images. |
| Keywords: | Magnetic nanoparticle FORC diagram Size distribution |
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