Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.137202
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Funding
- French ministry of research
- CEFIPRA (Indo-French centre for the promotion of advanced research)
- ANR (National Research Agency)
- CNRS
- Region Ile-de-France (CNANO and SESAME)
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The magnetic susceptibility of self-organized two-dimensional Co nanodots on Au(111) has been measured as a function of their size in the 2-7 nm diameter range. We show that the activation energy for the thermal reversal displays a power law behavior with the dot volume. Atomic scale simulations based on the Heisenberg Hamiltonian show that this behavior is due to a deviation from the macrospin model for dot size as small as 3 nm in diameter. This discrepancy is attributed to finite temperature effects through the thermal excitation of spin-wave modes inside the particles.
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