Spin Excitations in a 4f-3d Heterodimer on MgO

A. Singha, F. Donati, F. D. Natterer, C. Wäckerlin, S. Stavrić, Z. S. Popović, A. Z. Šljivančanin, F. Patthey, H. Brune

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Abstract

We report on the magnetic properties of HoCo dimers as a model system for the smallest intermetallic compound of a lanthanide and a transition metal atom. The dimers are adsorbed on ultrathin MgO(100) films grown on Ag(100). New for 4f elements, we detect inelastic excitations with scanning tunneling spectroscopy and prove their magnetic origin by applying an external magnetic field. In combination with density functional theory and spin Hamiltonian analysis, we determine the magnetic level distribution, as well as sign and magnitude of the exchange interaction between the two atoms. In contrast to typical 4f-3d bulk compounds, we find ferromagnetic coupling in the dimer.

Original languageEnglish
Article number257202
JournalPhysical Review Letters
Volume121
Issue number25
DOIs
StatePublished - 18 Dec 2018

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