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

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) fer...

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Bibliographic Details
Published in:Physical review letters 2004-06, Vol.92 (23), p.237201.1-237201.4, Article 237201
Main Authors: PIERCE, J. P, TORIJA, M. A, GAI, Z, SHI, Junren, SCHULTHESS, T. C, FARNAN, G. A, WENDELKEN, J. F, PLUMMER, E. W, SHEN, J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Physics
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.92.237201