Exchange Splitting of a Hybrid Surface State and Ferromagnetic Order in a 2D Surface Alloy
J. Seidel, P. M. Buhl, S. Mousavion, B. Dup\'e, E.S., Walther, K. Medjanik, D. Vasilyev, S. Babenkov, M. Ellguth, M., Maniraj, and J. Sinova, G. Sch\"onhense, H.-J. Elmers, M., Aeschlimann, B. Stadtm\"uller
TL;DR
This study investigates the spin-dependent electronic structure of a DyAg2 surface alloy, revealing exchange splitting of localized states and ferromagnetic order mediated by RKKY-like interactions at low temperature.
Contribution
It demonstrates the exchange splitting of a hybrid surface state and ferromagnetic coupling in a DyAg2 surface alloy, a novel insight into surface magnetism.
Findings
Significant exchange spin-splitting of Dy 4f states
Ferromagnetic coupling between Dy moments at 40 K
RKKY-like exchange mediated by surface state electrons
Abstract
Surface alloys are highly flexible materials for tailoring the spin-dependent properties of surfaces. Here, we study the spin-dependent band structure of a DyAg surface alloy formed on an Ag(111) crystal. We find a significant exchange spin-splitting of the localized Dy 4f states pointing to a ferromagnetic coupling between the localized Dy moments at K. The magnetic coupling between these moments is mediated by an indirect, RKKY-like exchange coupling via the spin-polarized electrons of the hole-like Dy-Ag hybrid surface state.
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Taxonomy
TopicsMagnetic properties of thin films · Quantum and electron transport phenomena · Topological Materials and Phenomena