Ferromagnetic stability in Fe nanodot assemblies on Cu(111) induced by indirect coupling through the substrate.

Pierce, J P; Torija, M A; Gai, Z; Shi, Junren; Schulthess, T C; Farnan, G A; Wendelken, J F; Plummer, E W; Shen, J

Pierce, J P; Torija, M A; Gai, Z; Shi, Junren; Schulthess, T C; Farnan, G A; Wendelken, J F; Plummer, E W; Shen, J.

Pierce JP; Condensed Matter Sciences Division, Oak Ridge National Laboratory, and Department of Physics and Astronomy, The University of Tennessee, Knoxville, USA.

Phys Rev Lett ; 92(23): 237201, 2004 Jun 11.

Article en En | MEDLINE | ID: mdl-15245191

ABSTRACT

ABSTRACT

We report collective ferromagnetic behavior with high Curie temperatures (T(c)) in Fe dot assemblies supported by the Cu(111) surface. Our ability to tune the average size and spacing of the individual dots allows us to conclude that enhanced magnetic anisotropy cannot account for this high-T(c) ferromagnetic order. Because our Monte Carlo simulations have ruled out the dipolar interaction as the dominant factor in this system, we attribute the origin of the ferromagnetic order to indirect exchange coupling via the Cu(111) substrate.

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Banco de datos: MEDLINE Idioma: En Año: 2004 Tipo del documento: Article

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Banco de datos: MEDLINE Idioma: En Año: 2004 Tipo del documento: Article