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O: Fachverband Oberflächenphysik

O 42: Metal substrates 2

O 42.3: Vortrag

Mittwoch, 7. September 2022, 11:00–11:15, S053

Breaking down of Stoner band ferromagnetism induced by interface formation — •David Janas¹, Andrea Droghetti², Iulia Cojocariu³, Vitaliy Feyer³, Stefano Ponzoni¹, Milos Radonjić⁴, Ivan Rungger⁵, Liviu Chioncel⁶, Giovanni Zamborlini¹, and Mirko Cinchetti¹ — ¹TU Dortmund University, Dortmund, Germany — ²Trinity College, Dublin, Ireland — ³Forschungszentrum Jülich, Jülich, Germany — ⁴University of Belgrade, Belgrade, Serbia — ⁵National Physics Laboratory, Teddington, United Kingdom — ⁶University of Augsburg, Augsburg, Germany

Interfaces between ferromagnetic transition metals and molecules or atoms display intriguing spin properties that have been invoked to explain the peculiar behavior of a variety of molecular spintronic and spin-optoelectronic devices [1]. Despite its relevance, a satisfying model for the hybridization occurring at such interfaces has not yet been presented. Experimentally, this is due to the lack of information on the interface band structure in the whole Brillouin zone, while, theoretically, the role of electron correlation has up to now mostly been neglected. Here, we overcome these limitations using state-of-the-art experimental and theoretical methods to explore the model interface between iron and an ordered oxygen layer. We use spin-resolved momentum microscopy to provide access to the complete spin-resolved interface band structure and explain our findings using DFT+Σ₂ calculations that go beyond the one-electron approximation [2].

[1] Cinchetti, M. et al. Nature Mater 16, 507-515 (2017).

[2] Droghetti, A. et al. Phys. Rev. B 105, 115129 (2022).