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

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.


Published in:
Physical Review Letters, 121, 25, 257202
Year:
Dec 18 2018
Publisher:
College Pk, AMER PHYSICAL SOC
ISSN:
0031-9007
1079-7114
Keywords:
Laboratories:




 Record created 2019-01-23, last modified 2019-03-26


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