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Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions

Generalov, Alexander LU ; Otrokov, Mikhail M.; Chikina, Alla; Kliemt, Kristin; Kummer, Kurt; Höppner, Marc; Güttler, Monika; Seiro, Silvia; Fedorov, Alexander and Schulz, Susanne, et al. (2017) In Nano Letters 17(2). p.811-820
Abstract

Finding ways to create and control the spin-dependent properties of two-dimensional electron states (2DESs) is a major challenge for the elaboration of novel spin-based devices. Spin-orbit and exchange-magnetic interactions (SOI and EMI) are two fundamental mechanisms that enable access to the tunability of spin-dependent properties of carriers. The silicon surface of HoRh2Si2 appears to be a unique model system, where concurrent SOI and EMI can be visualized and controlled by varying the temperature. The beauty and simplicity of this system lie in the 4f moments, which act as a multiple tuning instrument on the 2DESs, as the 4f projections parallel and perpendicular to the surface order at essentially different... (More)

Finding ways to create and control the spin-dependent properties of two-dimensional electron states (2DESs) is a major challenge for the elaboration of novel spin-based devices. Spin-orbit and exchange-magnetic interactions (SOI and EMI) are two fundamental mechanisms that enable access to the tunability of spin-dependent properties of carriers. The silicon surface of HoRh2Si2 appears to be a unique model system, where concurrent SOI and EMI can be visualized and controlled by varying the temperature. The beauty and simplicity of this system lie in the 4f moments, which act as a multiple tuning instrument on the 2DESs, as the 4f projections parallel and perpendicular to the surface order at essentially different temperatures. Here we show that the SOI locks the spins of the 2DESs exclusively in the surface plane when the 4f moments are disordered: the Rashba-Bychkov effect. When the temperature is gradually lowered and the system experiences magnetic order, the rising EMI progressively competes with the SOI leading to a fundamental change in the spin-dependent properties of the 2DESs. The spins rotate and reorient toward the out-of-plane Ho 4f moments. Our findings show that the direction of the spins and the spin-splitting of the two-dimensional electrons at the surface can be manipulated in a controlled way by using only one parameter: the temperature.

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Contribution to journal
publication status
published
subject
keywords
antiferromagnetism, ARPES, exchange-magnetic interaction, rare-earth intermetallics, Spin-orbit coupling
in
Nano Letters
volume
17
issue
2
pages
10 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85012016432
  • wos:000393848800031
ISSN
1530-6984
DOI
10.1021/acs.nanolett.6b04036
language
English
LU publication?
yes
id
8b5a81b5-64eb-4f4c-a25d-7462b864ddca
date added to LUP
2017-02-23 08:18:26
date last changed
2018-04-01 04:30:01
@article{8b5a81b5-64eb-4f4c-a25d-7462b864ddca,
  abstract     = {<p>Finding ways to create and control the spin-dependent properties of two-dimensional electron states (2DESs) is a major challenge for the elaboration of novel spin-based devices. Spin-orbit and exchange-magnetic interactions (SOI and EMI) are two fundamental mechanisms that enable access to the tunability of spin-dependent properties of carriers. The silicon surface of HoRh<sub>2</sub>Si<sub>2</sub> appears to be a unique model system, where concurrent SOI and EMI can be visualized and controlled by varying the temperature. The beauty and simplicity of this system lie in the 4f moments, which act as a multiple tuning instrument on the 2DESs, as the 4f projections parallel and perpendicular to the surface order at essentially different temperatures. Here we show that the SOI locks the spins of the 2DESs exclusively in the surface plane when the 4f moments are disordered: the Rashba-Bychkov effect. When the temperature is gradually lowered and the system experiences magnetic order, the rising EMI progressively competes with the SOI leading to a fundamental change in the spin-dependent properties of the 2DESs. The spins rotate and reorient toward the out-of-plane Ho 4f moments. Our findings show that the direction of the spins and the spin-splitting of the two-dimensional electrons at the surface can be manipulated in a controlled way by using only one parameter: the temperature.</p>},
  author       = {Generalov, Alexander and Otrokov, Mikhail M. and Chikina, Alla and Kliemt, Kristin and Kummer, Kurt and Höppner, Marc and Güttler, Monika and Seiro, Silvia and Fedorov, Alexander and Schulz, Susanne and Danzenbächer, Steffen and Chulkov, Evgueni V. and Geibel, Christoph and Laubschat, Clemens and Dudin, Pavel and Hoesch, Moritz and Kim, Timur and Radovic, Milan and Shi, Ming and Plumb, Nicholas C. and Krellner, Cornelius and Vyalikh, Denis V.},
  issn         = {1530-6984},
  keyword      = {antiferromagnetism,ARPES,exchange-magnetic interaction,rare-earth intermetallics,Spin-orbit coupling},
  language     = {eng},
  month        = {02},
  number       = {2},
  pages        = {811--820},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {Spin Orientation of Two-Dimensional Electrons Driven by Temperature-Tunable Competition of Spin-Orbit and Exchange-Magnetic Interactions},
  url          = {http://dx.doi.org/10.1021/acs.nanolett.6b04036},
  volume       = {17},
  year         = {2017},
}