Exchange Splitting of a Hybrid Surface State and Ferromagnetic Order in a 2D Surface Alloy

B. Dup\'e; B. Stadtm\"uller; D. Vasilyev; E.S. Walther; G. Sch\"onhense; H.-J. Elmers; J. Seidel; J. Sinova; K. Medjanik; M. Aeschlimann

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Exchange Splitting of a Hybrid Surface State and Ferromagnetic Order in a 2D Surface Alloy

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arxiv 1906.03780 v4 pith:EA4OZIN6 submitted 2019-06-10 cond-mat.mes-hall

J. Seidel , P. M. Buhl , S. Mousavion , B. Dupé , E.S. Walther , K. Medjanik , D. Vasilyev , S. Babenkov

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M. Ellguth M. Maniraj J. Sinova G. Schönhense H.-J. Elmers M. Aeschlimann B. Stadtmüller

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classification cond-mat.mes-hall

keywords surfacecouplingexchangealloyferromagnetichybridlocalizedmoments

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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$_2$ 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 $40\,$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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