Superparamagnetism in small Fe clusters on Cu(111)
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Fe clusters of 105±2 atoms/cluster were mass selectively deposited onto Cu(111) at cryogenic temperatures. XMCD was used to measure temperature and direction dependent magnetization curves. The clusters are superparamagnetic at the lowest temperature measured (10 K). Their magnetization curves are consistent with magnetic moments of ≈2.5μB per atom which are thus enhanced over the bulk values. Within experimental accuracy, the clusters do not present magnetocrystalline anisotropy in the temperature range of 10 K to 60 K.
PACS.36.40.Cg Electronic and magnetic properties of clusters 36.20.Kd Electronic structure and spectra 73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals 75.75.+a Magnetic properties of nanostructures 78.67.Bf Nanocrystals and nanoparticles
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- B. Lazarovits, B. Ùjfalussy, L. Szunyogh, G.M. Stocks, P. Weinberger, J. Phys.: Condens. Matter 16, S5833 (2004) Google Scholar