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Magnetic properties of ball-milled Mn nanoparticles
Institution:1. Organic Electronic Technologies P.C., Antoni Tritsi 21B, 57001 Thessaloniki;2. Lab for Thin Films, Nanobiomaterials, Nanosystems & Nanometrology (LTFN), Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Departamento de Ciencias Naturales and Exactas, Universidad de la Costa, Barranquilla, Colombia;2. Grupo de Investigación en Física Aplicada, Departamento de Física, Universidad del Norte, Barranquilla, Colombia;1. Facultad de Ingeniería, Universidad Autónoma del Carmen, Campus III, Av. Central S/N, C.P. 24115 MSNH, Ciudad del Carmen, Campeche, Mexico;2. Instituto de Investigación en Metalurgia y Materiales, UMSNH, C.P. 58000, Morelia, Mich, Mexico;1. National University of Science and Technology “MISIS”, 4, Leninskiy Pr., 119049 Moscow, Russia;2. Crystal Ltd., 45B, Stantsionnaya Str., 141060 Korolev, Russia
Abstract:Nanoparticles of Mn of sizes  < 500 Å were prepared by the ball-milling technique. The temperature dependence of the magnetic susceptibility χ showed systematic variation with particle size. Peaks observed in χ were attributed to the magnetic ordering of the oxides Mn3O4and MnO. Peaks found in (χT) / ∂T were associated with the Neel temperature ofα -Mn. We estimated that our samples contain about 0.4% of Mn3O4. This low concentration of Mn3O4was not detected by X-ray diffraction experiments but contributed significantly to the magnetization measurements.
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