González Herrera, Elvira MaríaMontero, M. I.Cebollada, F.De Julián Fernández, CVicent López, José LuisGonzález, J. M.2023-06-202023-06-201998-04-010295-507510.1209/epl/i1998-00557-xhttps://hdl.handle.net/20.500.14352/60180©EDP Sciences.We analyze the magnetic properties of mechanically ground nanosized Ni particles dispersed in a SiO_2 matrix. Our magnetic characterization of the as-milled samples show the occurrence of two blocking processes and that of non-monotonic milling time evolutions of the magnetic-order temperature, the high-field magnetization and the saturation coercivity. The measured coercivities exhibit giant values and a uniaxial- type temperature dependence. Thermal treatment carried out in the as-prepared samples result in a remarkable coercivity reduction and in an increase of the high-field magnetization. We conclude, on the basis of the consideration of a core (pure Ni) and shell (Ni-Si inhomogeneous alloy) particle structure, that the magnetoelastic anisotropy plays the dominant role in determining the magnetic properties of our particles.engjournal articlehttp://dx.doi.org/10.1209/epl/i1998-00557-xhttp://iopscience.iop.orgopen access538.9Metal-filmsFísica de materialesFísica del estado sólido2211 Física del Estado Sólido