Volume 76, Number 1, October 2006
|Page(s)||142 - 148|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||06 September 2006|
Tuning the magnetic anisotropy of nanoparticles by metal capping
Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza and Departamento de Física de la Materia Condensada, Universidad de Zaragoza 50009 Zaragoza, Spain
2 Unité Mixte de Physique CNRS/Thales - Route Départementale 128 91767 Palaiseau Cedex, France
3 Université Paris-Sud - 91405 Orsay Cedex, France
4 European Synchrotron Radiation Facility - BP 220, F-38043 Grenoble, France
Accepted: 14 August 2006
The magnetic anisotropy of Co clusters with diameters ranging from 1.1 to 4.5 turns out to be significantly larger than in bulk and strongly increasing with decreasing cluster size. The dominating role of the surface can be used to modify the anisotropy by changing the electronic properties of the matrix surrounding the clusters. We find that capping the clusters by a metallic (Cu and Au) layer significantly enhances the anisotropy, thus also stabilizing the magnetization against thermal fluctuations. The observed anisotropy enhancement is attributed to the bonding of the Co electrons to the conduction band of the capping layer, which depends on the electronic band structures of both metals.
PACS: 75.50.Tt – Fine-particle systems; nanocrystalline materials / 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 2006
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.