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Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2

Schulz, Susanne (author)
Dresden University of Technology
Nechaev, Ilya A. (author)
CSIC Centro de Física de Materiales (UPV/EHU),Donostia International Physics Center (DIPC)
Güttler, Monika (author)
Dresden University of Technology
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Poelchen, Georg (author)
Dresden University of Technology
Generalov, Alexander (author)
Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
Danzenbächer, Steffen (author)
Dresden University of Technology
Chikina, Alla (author)
Paul Scherrer Institute
Seiro, Silvia (author)
Leibniz Institute for Solid State and Materials Research
Kliemt, Kristin (author)
Goethe University
Vyazovskaya, Alexandra Yu (author)
Tomsk State University,Saint Petersburg State University
Kim, Timur K. (author)
Diamond Light Source
Dudin, Pavel (author)
Diamond Light Source
Chulkov, Evgueni V. (author)
Tomsk State University,University of the Basque Country,CSIC Centro de Física de Materiales (UPV/EHU),Saint Petersburg State University,Donostia International Physics Center (DIPC)
Laubschat, Clemens (author)
Dresden University of Technology
Krasovskii, Eugene E. (author)
University of the Basque Country,Donostia International Physics Center (DIPC),Basque Foundation for Science
Geibel, Christoph (author)
Max Planck Institute for Chemical Physics of Solids
Krellner, Cornelius (author)
Goethe University
Kummer, Kurt (author)
European Synchrotron Radiation Facility
Vyalikh, Denis V. (author)
University of the Basque Country,Donostia International Physics Center (DIPC),Basque Foundation for Science
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 (creator_code:org_t)
2019-06-03
2019
English.
In: npj Quantum Materials. - : Springer Science and Business Media LLC. - 2397-4648. ; 4:1
Related links:
http://dx.doi.org/10... (free)
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIr2Si2, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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