Size dependence of the magnetic moments of exposed nanoscale iron particles |
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| Affiliation: | 1. Department of Physics and Astronomy, University of Leicester, Leicester Le1 7RH, UK;2. European Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France;1. Grupo de Nuevos Materiales, Universidad Popular del Cesar, Valledupar, Colombia;2. Grupo de Estudios de Materiales—GEMA, Departamento de Física, Universidad Nacional de Colombia, AA 5997 Bogotá DC, Colombia;3. Grupo de Física de Nuevos Materiales, Departamento de Física, Universidad Nacional de Colombia, AA 5997 Bogotá DC, Colombia;4. Departamento de Física, Universidade Federal de Sergipe, Brasil;1. Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 04154 Košice, Slovakia;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia;1. Seção de Engenharia de Materiais, Instituto Militar de Engenharia, Praça General Tiburcio, 80, 22290-270 Rio de Janeiro, RJ, Brazil;1. Department of Physics, Manipal Institute of Technology, MAHE, Manipal, Karnataka 576104, India;2. UGC-DAE Consortium for Scientific Research, Mumbai Centre, BARC Campus, Trombay, Mumbai 400085, India;3. DST PURSE Program, Mangalore University, Mangalagangotri, Mangalore, Karnataka 574199, India |
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| Abstract: | ![]()
The magnetic moments in exposed, mass-selected, nanoscale Fe clusters in the size range 1.89–2.20 nm (300–475 atoms), deposited onto graphic in situ have been measured by X-ray magnetic circular dichroism. The smallest clusters possess moments that are enhanced by around 4% for mspin and 80% for morb and decrease towards the bulk value with increasing size. The larger clusters show an in-plane anisotropy that is consistent with the anisotropy in the orbital moment. The smallest clusters are, within experimental error, magnetically isotropic. The anisotropy constant in the 475-atom clusters is significantly higher than the bulk value. |
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