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

Schulz, Susanne ; Nechaev, Ilya A. ; Güttler, Monika ; Poelchen, Georg ; Generalov, Alexander LU ; Danzenbächer, Steffen ; Chikina, Alla ; Seiro, Silvia ; Kliemt, Kristin and Vyazovskaya, Alexandra Yu , et al. (2019) In npj Quantum Materials 4(1).
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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
npj Quantum Materials
volume
4
issue
1
article number
26
publisher
Nature Publishing Group
external identifiers
  • scopus:85066613907
ISSN
2397-4648
DOI
10.1038/s41535-019-0166-z
language
English
LU publication?
yes
id
7591d715-a18e-40f2-8a1d-62e4885a4bd6
date added to LUP
2019-06-24 15:05:02
date last changed
2022-04-26 01:56:27
@article{7591d715-a18e-40f2-8a1d-62e4885a4bd6,
  abstract     = {{<p>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 EuIr<sub>2</sub>Si<sub>2</sub>, 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.</p>}},
  author       = {{Schulz, Susanne and Nechaev, Ilya A. and Güttler, Monika and Poelchen, Georg and Generalov, Alexander and Danzenbächer, Steffen and Chikina, Alla and Seiro, Silvia and Kliemt, Kristin and Vyazovskaya, Alexandra Yu and Kim, Timur K. and Dudin, Pavel and Chulkov, Evgueni V. and Laubschat, Clemens and Krasovskii, Eugene E. and Geibel, Christoph and Krellner, Cornelius and Kummer, Kurt and Vyalikh, Denis V.}},
  issn         = {{2397-4648}},
  language     = {{eng}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{npj Quantum Materials}},
  title        = {{Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr<sub>2</sub>Si<sub>2</sub>}},
  url          = {{http://dx.doi.org/10.1038/s41535-019-0166-z}},
  doi          = {{10.1038/s41535-019-0166-z}},
  volume       = {{4}},
  year         = {{2019}},
}