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Phys. Rev. Lett. 92, 237201 (2004) [4 pages]

Ferromagnetic Stability in Fe Nanodot Assemblies on Cu(111) Induced by Indirect Coupling through the Substrate

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J. P. Pierce1,2, M. A. Torija1,2, Z. Gai1,3, Junren Shi1, T. C. Schulthess4, G. A. Farnan1, J. F. Wendelken1, E. W. Plummer1,2, and J. Shen1,*
1Condensed Matter Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
2Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
3Department of Physics & State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100080, People’s Republic of China
4Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

Received 23 February 2004; published 9 June 2004

We report collective ferromagnetic behavior with high Curie temperatures (Tc) 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-Tc 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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.237201
DOI:
10.1103/PhysRevLett.92.237201
PACS:
75.75.+a, 75.50.Bb, 81.07.–b

*Author to whom correspondence should be addressed.

Electronic address: shenj@ornl.gov

 
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