Abstract
The ferromagnetic behavior in two-dimensional Fe dot assemblies on the Cu(111) surface that persists above room temperature was discussed. To tune the average size and spacing of the dots enables one to investigate the relative contribution of the mechanisms that support the robust magnetic order. It was found that by growing assemblies of magnetic dots which had a fixed average size and varied spacing and then monitoring the resulting influence on the magnetic behavior. The results show that enhanced magnetic anisotropy cannont account for high Curi temperature (Tc) ferromagnetic orders.
Original language | English |
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Article number | 237201 |
Pages (from-to) | 237201-1-237201-4 |
Journal | Physical Review Letters |
Volume | 92 |
Issue number | 23 |
DOIs | |
State | Published - Jun 11 2004 |
Funding
We are grateful to Zhenyu Zhang for valuable discussions. This work was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725, and by the U.S. National Science Foundation under Contract No. DMR 0105232.