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Interfacial magnetic coupling between Fe nanoparticles in Fe-Ag granular alloys

Abstract: The role of the interface in mediating interparticle magnetic interactions has been analysed in Fe50Ag50 and Fe55Ag45 granular thin films deposited by the pulsed laser deposition technique (PLD). These samples are composed of crystalline bcc Fe (2?4 nm) nanoparticles and fcc Ag (10?12 nm) nanoparticles, separated by an amorphous Fe50Ag50 interface, occupying around 20% of the sample volume, as determined by x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS), and high resolution transmission electron microscopy (HRTEM). Interfacial magnetic coupling between Fe nanoparticles is studied by dc magnetization and x-ray magnetic circular dichroism (XMCD) measurements at the Fe K and Ag L2,3 edges. This paper reveals that these thin films present two magnetic transitions, at low and high temperatures, which are strongly related to the magnetic state of the amorphous interface, which acts as a barrier for interparticle magnetic coupling.

 Autoría: Alonso J., Fdez-Gubieda M.L., Sarmiento G., Chaboy J., Boada R., García Prieto A., Haskel D., Laguna-Marco M.A., Lang J.C., Meneghini C., Fernndez Barquín L., Neisius T., Orue I.,

 Fuente: Nanotechnology (2012), Volume 23, Number 2, article number 025705

Editorial: IOP Publishing

 Fecha de publicación: 20/01/2012

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0957-4484/23/2/025705

ISSN: 0957-4484,1361-6528

 Proyecto español: CICYT-MAT2008-06542-C04

Url de la publicación: https://doi.org/10.1088/0957-4484/23/2/025705

Autoría

ALONSO, J.

FDEZ-GUBIEDA, M. L.

SARMIENTO, G.

CHABOY, J.

BOADA, R.

GARCÍA PRIETO, A.

HASKEL, D.

LAGUNA-MARCO, M. A.

LANG, J. C.

MENEGHINI, C.

ORUE, I.