Issue |
Europhys. Lett.
Volume 42, Number 1, April 1998
|
|
---|---|---|
Page(s) | 91 - 96 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1998-00557-x | |
Published online | 01 September 2002 |
Magnetic properties of Ni nanoparticles dispersed in silica prepared by high-energy ball milling
1
Instituto de Ciencia de Materiales de Madrid-CSIC 28049 Cantoblanco, Madrid, Spain
2
Departamento de Física de Materiales, Facultad de Ciencias Físicas Universidad
Complutense, Avda. Complutense s/n 28040 Madrid, Spain
Corresponding author: immgf4a@fresno.csic.es
Received:
7
November
1997
Accepted:
9
February
1998
We analyze the magnetic properties of mechanically ground nanosized Ni
particles dispersed in a 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.
PACS: 75.50.Tt – Fine-particle systems / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.60.Nt – Magnetic annealing and temperature-hysteresis effects
© EDP Sciences, 1998
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.