RT Journal Article
T1 Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling
A1 González Herrera, Elvira María
A1 Montero, M. I.
A1 Cebollada, F.
A1 De Julián Fernández, C
A1 Vicent López, José Luis
A1 González, J. M.
AB 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.
PB E D P Sciences
SN 0295-5075
YR 1998
FD 1998-04-01
LK https://hdl.handle.net/20.500.14352/60180
UL https://hdl.handle.net/20.500.14352/60180
LA eng
NO ©EDP Sciences.
DS Docta Complutense
RD 7 may 2024