Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/37786
Share/Impact:
Title: Giant magnetic anisotropy at the nanoscale: Overcoming the superparamagnetic limit
Authors: Hernando, Antonio, Crespo, Patricia, García, M. A., Fernández Pinel, E., Venta, J. de la, Fernández-Camacho, A., Penadés, Soledad
Keywords: Palladium
Gold
Nanoparticles
Temperature
Magnetization
Anisotropies
Thiol
Gold films
Issue Date: 17-Aug-2006
Publisher: American Physical Society
Abstract: It has been observed for palladium and gold nanoparticles that the magnetic moment at a constant applied field does not change with temperature over the range comprised between 5 and 300 K. These samples, with sizes smaller than 2.5 nm, exhibit remanent magnetization up to room temperature. The existence of permanent magnetism up to so high temperatures has been explained as due to the blocking of a local magnetic moment by giant magnetic anisotropies. In this Brief Report we show, by analyzing the anisotropy of thiol capped gold films, that the orbital momentum induced at the surface conduction electrons is crucial to understand the observed giant anisotropy. The orbital motion is driven by a localized charge and/or spin through spin-orbit interaction, which reaches extremely high values at the surfaces. The induced orbital moment gives rise to an effective field of the order of 103 T that is responsible for the giant anisotropy.
Description: 4 páginas, 3 figuras.
Publisher version (URL): http://dx.doi.org/10.1103/PhysRevB.74.052403
URI: http://hdl.handle.net/10261/37786
ISSN: 1098-0121
???metadata.dc.identifier.doi???: 10.1103/PhysRevB.74.052403
Citation: Physical Review - Section B - Condensed Matter 74(5): 05403
Appears in Collections:(IIQ) Artículos
(ICMS) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.