Physics – Condensed Matter – Materials Science
Scientific paper
2001-08-20
Physics
Condensed Matter
Materials Science
13 figures submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.65.094409
We study the magnetic properties of spherical Co clusters with diameters between 0.8 nm and 5.4 nm (25 to 7500$ atoms) prepared by sequential sputtering of Co and Al2O3. The particle size distribution has been determined from the equilibrium susceptibility and magnetization data and it is compared to previous structural characterizations. The distribution of activation energies was independently obtained from a scaling plot of the ac susceptibility. Combining these two distributions we have accurately determined the effective anisotropy constant Keff. We find that Keff is enhanced with respect to the bulk value and that it is dominated by a strong anisotropy induced at the surface of the clusters. Interactions between the magnetic moments of adjacent layers are shown to increase the effective activation energy barrier for the reversal of the magnetic moments. Finally, this reversal is shown to proceed classically down to the lowest temperature investigated (1.8 K).
Bartolomé Juan
Fettar F.
Garcia Luis Miguel
Luis Fernando
Maurice Jean-Luc
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