Magnetic State Control in a 3d Dimer on a Metallic Substrate

M.G. Dudnik, V.M. Uzdin

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The Alexander–Anderson model is used to investigate the magnetic states of a dimer composedof 3d-element atoms on a metallic substrate in the local mean field approximation enabling the examination of noncollinear magnetic states. The magnetic moments localized near the dimer atoms are calculated self consistently depending on the angle θ between them under the action of an external magnetic field. The dependence between the angle θ of the ground state and the number N of d electrons around the dimer atom is determined. The transition between the antiferromagnetic and ferromagnetic exchange interactions of the dimer magnetic moments is implemented with increasing N. The dimer ground state near the transition is noncollinear, cannot be described by the Heisenberg model, and is very sensitive to the influence of an external magnetic field. The interaction between 3d dimer atoms and the substrate, gas adsorption, and external fields can vary the number of d electrons, making it possible to control magnetic state
Original languageEnglish
Pages (from-to)540-545
JournalJournal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques
Issue number3
StatePublished - 2015


  • collective electron magnetism
  • Alexander–Anderson model
  • magnetic dimer
  • noncollinear magnetic ordering
  • self-consistent calculations


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