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MA: Fachverband Magnetismus

MA 58: Surface magnetism II

MA 58.4: Vortrag

Freitag, 16. März 2018, 10:15–10:30, EB 202

Valence and magnetism of samarium single atoms and clusters on noble metal surfaces — •Alessandro Barla¹, César Moreno², Miguel Angel Valbuena², Sanjoy K. Mahatha¹, Luca Persichetti³, Corneliu Nistor³, Sylvie Godey², David Coffey⁵, José Ignacio Arnaudas⁵, Pierluigi Gargiani⁴, Pietro Gambardella³, Aitor Mugarza^2,6, and Carlo Carbone¹ — ¹Istituto di Struttura della Materia, CNR, Trieste, Italy — ²Catalan Institute of Nanoscience and Nanotechnology (ICN2), Cerdanyola del Vallès, Spain — ³Department of Materials, ETH Zürich, Zürich, Switzerland — ⁴ALBA Synchrotron Light Source, Cerdanyola del Vallès, Spain — ⁵Instituto de Nanociencia de Aragón, Universidad de Zaragoza, Zaragoza, Spain — ⁶Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain

There is currently strong interest in the magnetic properties of individual rare-earth atoms, after the discovery of magnetic remanence of Ho adatoms adsorbed on the MgO surface [1]. We present our results on the electronic and magnetic properties of samarium individual atoms and small clusters adsorbed on noble metal surfaces [Cu(111), Ag(111) and Ag(100)]. Our combined XMCD and STM investigations show that Sm atoms and small 2D clusters are in a divalent state characterized by van Vleck paramagnetism. A magnetically almost isotropic trivalent component appears as soon as the second Sm layer starts growing. From the third Sm layer the growth becomes three-dimensional and larger clusters exhibit superparamagnetism with a strong out-of-plane magnetic anisotropy. [1] F. Donati et al., Science 352, 318 (2016)