The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

, Volume 10, Issue 1, pp 119-122

Magnetization of Gd \(\) cluster: Anomalous thermal behavior

  • V.Z. CerovskiAffiliated withDepartment of Physics and Astronomy and The Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824, USA
  • , S.D. MahantiAffiliated withDepartment of Physics and Astronomy and The Center for Fundamental Materials Research, Michigan State University, East Lansing, MI 48824, USA
  • , S.N. KhannaAffiliated withDepartment of Physics, Virginia Commonwealth University, Richmond, VA 23284-2000, USA

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Abstract:

Theoretical studies of the temperature (T) dependence of magnetization of Gd13 clusters have been carried out within a classical Heisenberg model using Monte-Carlo simulations. It is shown that for a broad range of values of \(\), defined as the ratio between competing ferro and anti-ferro magnetic couplings, the cluster magnetization increases with T in the low T region, as seen in experiment. The clusters are also shown to exhibit a wide distribution of moments at a given T, which broadens significantly with increasing T. It is suggested that this may affect the observed magnetic behavior of magnetic clusters in Stern-Gerlach experiments.

PACS. 31.15.Ar Ab initio calculations - 36.40.-c Atomic and molecular clusters - 71.24.+q Electronic structure of clusters and nanoparticles