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O: Fachverband Oberflächenphysik
O 15: Focus Session Many-Body Phenomena in Nanomagnets: Kondo, Spinons, Spinarons and Beyond (joint session O/TT)
O 15.6: Vortrag
Montag, 17. März 2025, 17:30–17:45, H24
Emergence of spinaronic states in Fe adatoms — Ilias Klepetsanis1,2, Juba Bouaziz4, •Philipp Rüssman1,3, and Samir Lounis1,2 — 1Forschungszentrum Jülich & JARA, Germany — 2University of Duisburg-Essen and CENIDE, Germany — 3University of Würzburg, Germany — 4Research Center for Advanced Science and Technology, University of Tokyo, Japan
In recent years, spinarons, predicted from first-principles calculations [1], have been observed in Co adatoms on the Cu(111) surface, using spin-polarized scanning tunnelling spectroscopy (STS) in high magnetic fields [2]. Spinarons leave a non-trivial spectroscopic signature, for long interpreted to originate from the Kondo effect [3]. Here, we employ relativistic time-dependent density functional and many-body perturbation theory, to investigate the case of Fe adatoms on the Cu(111) surface, which carry a large magnetic moment of 3.25µB preferring an out-of-plane orientation as dictated by a magnetic anisotropy energy of 2meV. In contrast to the Co adatom, the spinarons in Fe do not overlap with trivial spin-excitations. We discuss the spinaronic response to an out-of-plane magnetic field, the orbital character and the impact of spin-orbit coupling. [1] J. Bouaziz et al., Nat. Commun. 11, 6112 (2020); [2] F. Friedrich et al., Nat. Phys. 20, 28 (2024); [3] V. Madhavan et al., Science 280, 567 (1998)
Keywords: Spinarons; Magnetism; Spin excitations; DFT; MBPT