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Low-temperature first-order reversal curves and interaction effects on assemblies of iron oxide nanoparticles |
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| Authors: | Zhijun Zhang Liviu Clime Garnette Sutherland |
| Affiliation: | a Functional Nanomaterials Group, Industrial Materials Institute, National Research Council Canada, 75 de Mortagne Boulevard, Boucherville, QC, Canada J4B 6Y4 b Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Dushu Lake Higher Education District, Suzhou Industrial Park, Suzhou, 215125, China c Institute for Biodiagnostics (West), National Research Council Canada, 3330 Hospital Dr NW, Calgary, Alberta, Canada T2N 4N1 d Department of Clinical Neurosciences, University of Calgary, 1403 - 29th Street N.W., Alberta, Canada T2N 4N1 e Énergie, Matériaux et Télécommunications, Institut national de la recherche scientifique, Université du Québec, 1650 boulevard Lionel-Boulet, Varennes, Québec, Canada J3X 1S2 |
| Abstract: | We present the synthesis and magnetic properties of high quality uncoated and gold-coated iron oxide magnetic nanoparticles. The structural properties of these nanoparticles are investigated by transmission electron microscopy, UV-visible spectroscopy and X-ray diffraction. Experimental results and theoretical simulations indicate that the synthesized nanoparticles present a very good monodispersity, and well defined size and shape. The coercive field of these particles is identified by low-temperature first-order reversal curves and the results used in order to fit zero-field-cooled magnetization processes with theoretical models. The identification of the parameters in this analysis suggests that the coating process hardly affects the morphology and the overall magnetic properties of the cores inside coated particles. |
| Keywords: | 75.50.Tt 75.60.-d 75.30.Gw |
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