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arXiv · 1906.03780

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

J. Seidel·P. M. Buhl·S. Mousavion·B. Dupé·E. S. Walther·K. Medjanik·D. Vasilyev·S. Babenkov·M. Ellguth·M. Maniraj·J. Sinova·G. Schönhense·H. -J. Elmers·M. Aeschlimann·B. Stadtmüller
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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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J. Seidel, P. M. Buhl, S. Mousavion, B. Dupé, E. S. Walther, K. Medjanik, D. Vasilyev, S. Babenkov, M. Ellguth, M. Maniraj, J. Sinova, G. Schönhense, H. -J. Elmers, M. Aeschlimann, B. Stadtmüller. 2019-06-10. Exchange Splitting of a Hybrid Surface State and Ferromagnetic Order in a 2D Surface Alloy. https://arxiv.org/abs/1906.03780

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