Ordering of free-standing Co nanoparticles |
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| Affiliation: | 1. ISMN-CNR, Via Salaria Km 29,300, 00016 Monterotondo St., Rome, Italy;2. Institute of Physics SAS, 84511 Bratislava, Slovakia;3. Institute of Informatics SAS, 84507 Bratislava, Slovakia;4. Institute of Physics, University Duisburg-Essen, 47048 Duisburg, Germany;5. INFM and University of Lecce, 73100 Lecce, Italy;6. Hahn-Meitner Institute, 14109 Berlin, Germany |
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| Abstract: | Colloidal Co particles of 11 nm diameter were deposited on Si substrate by spin coating and/or casting in magnetic field. A perpendicular magnetic field varying along the diagonal of the substrate was also applied. The samples were analyzed by transmission electron microscopy (TEM), field emission gun scanning electron microscopy (SEM-FEG), atomic and magnetic force microscopy (AFM/MFM). TEM micrographs show local order when a Co nanoparticle monolayer is deposited on Si. Drying the colloidal solution in a magnetic field leads to the formation of quite large clusters (0.3 μm) of Co nanoparticles. A stripe structure was then observed when the particles were deposited by casting in the varying magnetic field. AFM/MFM measurements show isolated Co clusters on the stripes. Magnetic features corresponding to the single Co cluster have been observed pointing out that all magnetic moments in the cluster are oriented along the field direction. |
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