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

Schulz, S., Nechaev, I. A., Güttler, M., Poelchen, G., Generalov, A., Danzenbächer, S., et al. (2019). Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2. npj Quantum Materials, 4(1): 26, pp. 1-8. doi:10.1038/s41535-019-0166-z.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-CED7-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CEDE-C
Genre: Journal Article

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 Creators:
Schulz, Susanne1, Author
Nechaev, Ilya A.1, Author
Güttler, Monika1, Author
Poelchen, Georg1, Author
Generalov, Alexander1, Author
Danzenbächer, Steffen1, Author
Chikina, Alla1, Author
Seiro, Silvia1, Author
Kliemt, Kristin1, Author
Vyazovskaya, Alexandra Yu.1, Author
Kim, Timur K.1, Author
Dudin, Pavel1, Author
Chulkov, Evgueni V.1, Author
Laubschat, Clemens1, Author
Krasovskii, Eugene E.1, Author
Geibel, Christoph2, Author              
Krellner, Cornelius1, Author
Kummer, Kurt1, Author
Vyalikh, Denis V.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: 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. © 2019, The Author(s).

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Language(s): eng - English
 Dates: 2019-06-032019-06-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41535-019-0166-z
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Title: npj Quantum Materials
  Other : npj Quantum Mater.
Source Genre: Journal
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Publ. Info: [London] : Nature Publishing Group
Pages: - Volume / Issue: 4 (1) Sequence Number: 26 Start / End Page: 1 - 8 Identifier: ISSN: 2397-4648
CoNE: https://pure.mpg.de/cone/journals/resource/2397-4648