Buscar

Estamos realizando la búsqueda. Por favor, espere...

 Detalle_Publicacion

Breakdown of magnetism in sub-nanometric Ni clusters embedded in Ag

Abstract: Downsizing to the nanoscale has opened up a spectrum of new magnetic phenomena yet to be discovered. In this context, we investigate the magnetic properties of Ni clusters embedded in a metallic Ag matrix. Unlike in Ni free-standing clusters, where the magnetic moment increases towards the atomic value when decreasing the cluster size, we show, by tuning the Ni cluster size down to the sub-nanoscale, that there is a size limit below which the clusters become non-magnetic when embedded in Ag. To this end, we have fabricated by DC-sputtering a system composed of sub-nanometer sized and non interacting Ni clusters embedded into a Ag matrix. A thorough experimental characterization by means of structural techniques (x-ray diffraction, x-ray absorption spectroscopy) and DC-magnetization confirms that the cluster size is in the sub-nanometric range and shows that the magnetization of the system is dramatically reduced, reaching only 38% of the bulk value. The experimental system has been reproduced by density functional theory calculations on Ni m clusters (m = 1–6, 10 and 13) embedded in Ag. The combination of the experimental and theoretical analysis points out that there is a breakdown of magnetism occurring below a cluster size of six atoms. According to our results, the loss of magnetic moment is not due to Ag–Ni hybridization but to charge transfer between the Ni sp and d orbitals, and the reduced magnetization observed experimentally is explained on the basis of the presence of a narrow cluster size-distribution where magnetic and non-magnetic clusters coexist.

 Fuente: Nanotechnology, Vol. 26, Num. 45, Art. Num. 455703 (2015)

Editorial: IOP Publishing

 Año de publicación: 2015

Nº de páginas: 10

Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0957-4484/26/45/455703

ISSN: 0957-4484,1361-6528

 Proyecto español: MAT2011-27573-C04

Url de la publicación: https://doi.org/10.1088/0957-4484/26/45/455703

Autoría

ANA GARCIA PRIETO

ARTECHE, A.

AGUILERA GRANJA, F.

TORRES, M. B.

ORUE GOIKURIA, IÑAKI

ALONSO, J.

FERNÁNDEZ GUBIEDA, M. L.