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  Robust and tunable itinerant ferromagnetism at the silicon surface of the antiferromagnet GdRh2Si2

Güttler, M., Generalov, A., Otrokov, M. M., Kummer, K., Kliemt, K., Fedorov, A., et al. (2016). Robust and tunable itinerant ferromagnetism at the silicon surface of the antiferromagnet GdRh2Si2. Scientific Reports, 6: 24254, pp. 1-11. doi:10.1038/srep24254.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-52B8-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1A22-6
Genre: Journal Article

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 Creators:
Güttler, M.1, Author
Generalov, A.1, Author
Otrokov, M. M.1, Author
Kummer, K.1, Author
Kliemt, K.1, Author
Fedorov, A.1, Author
Chikina, A.1, Author
Danzenbächer, S.1, Author
Schulz, S.1, Author
Chulkov, E. V.1, Author
Koroteev, Yu. M.1, Author
Caroca-Canales, N.2, Author              
Shi, M.1, Author
Radovic, M.1, Author
Geibel, C.3, Author              
Laubschat, C.1, Author
Dudin, P.1, Author
Kim, T. K.1, Author
Hoesch, M.1, Author
Krellner, C.1, Author
Vyalikh, D. V.1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: Spin-polarized two-dimensional electron states (2DESs) at surfaces and interfaces of magnetically active materials attract immense interest because of the idea of exploiting fermion spins rather than charge in next generation electronics. Applying angle-resolved photoelectron spectroscopy, we show that the silicon surface of GdRh2Si2 bears two distinct 2DESs, one being a Shockley surface state, and the other a Dirac surface resonance. Both are subject to strong exchange interaction with the ordered 4f-moments lying underneath the Si-Rh-Si trilayer. The spin degeneracy of the Shockley state breaks down below similar to 90 K, and the splitting of the resulting subbands saturates upon cooling at values as high as similar to 185 meV. The spin splitting of the Dirac state becomes clearly visible around similar to 60 K, reaching a maximum of similar to 70 meV. An abrupt increase of surface magnetization at around the same temperature suggests that the Dirac state contributes significantly to the magnetic properties at the Si surface. We also show the possibility to tune the properties of 2DESs by depositing alkali metal atoms. The unique temperature-dependent ferromagnetic properties of the Si-terminated surface in GdRh2Si2 could be exploited when combined with functional adlayers deposited on top for which novel phenomena related to magnetism can be anticipated.

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Language(s): eng - English
 Dates: 2016-04-07
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000373582000001
DOI: 10.1038/srep24254
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 6 Sequence Number: 24254 Start / End Page: 1 - 11 Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322