Spin-dependent surface barrier from very-low-energy electron diffraction fine structures: A feasibility study

Burgbacher, Ulrich; Braun, J.; Brüning, Ann-Katrin; Schmidt, Anke B.; Donath, M.

doi:10.1103/physrevb.87.195411

Cited by 7 publications

(6 citation statements)

References 52 publications

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“…The asymmetry of elastically scattered electrons from surfaces with a large SOC has been investigated in great details [13,[27][28][29][30][31][32][33]. It has been realized that the presence of the surface barrier at the surfaces cannot create a noticeable spin asymmetry [13,27].…”

Section: Discussionmentioning

confidence: 99%

“…It has been realized that when a beam of spin-polarized slow electrons is elastically scattered from a surface with a large SOC, the scattering intensity can exhibit a spin asymmetry, depending on the relative orientation of the spin of the incoming beam with respect to the scattering plane [13,[26][27][28]. The effect is a direct consequence of SOC [13,[26][27][28][29][30][31][32][33]. The asymmetry caused by SOC is also present in the inelastic part of the scattering.…”

Section: Introductionmentioning

confidence: 99%

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Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Zakeri

Berthod

2022

Phys. Rev. B

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The scattering theory of low-energy (slow) electrons has been developed by Evans and Mills [Phys. Rev. B 5, 4126 (1972)]. The formalism is merely based on the electrostatic Coulomb interaction of the scattering electrons with the charge-density fluctuations above the surface and can describe most of the interesting features observed in the high-resolution electron energy-loss spectroscopy experiments. Here we extend this theory by including the spin-orbit coupling in the scattering process. We discuss the impact of this interaction on the scattering cross-section. In particular, we discuss cases in which a spin-polarized electron beam is scattered from nonmagnetic surfaces with a strong spin-orbit coupling. We show that under some assumptions one can derive an expression for the scattering cross-section, which can be used for numerical calculations of the spin-polarized spectra recorded by spin-polarized high-resolution electron energy-loss spectroscopy experiments.Here we revisit the theory of low-energy electron scat-

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Zakeri

Berthod

2022

Phys. Rev. B

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“…The calculational results for the reflectivity, the spin-orbit induced asymmetry and the figure of merit have been obtained by means of fully relativistic VLEED (VSPLEED) calculations [1,33], which are based on the layer Korringa-Kohn-Rostoker approach introduced first by Pendry [41] and later on by Feder [42]. The half-space electronic structure, which serves as an input quantity for the spectroscopic analysis, results from a self-consistent SPRKKR calculation in its tight-binding formulation (TBKKR) [43].…”

Section: Computational Detailsmentioning

confidence: 99%

“…Spin-dependent electron reflection at ferromagnetic and/or spin-orbit-influenced surfaces is of scientific interest because it provides information about the spin dependence of electron scattering at the surface barrier of a given material [1]. In addition, it can be applied to detect the spin polarization of an electron beam impinging on the respective surface.…”

Section: Introductionmentioning

confidence: 99%

Spin-dependent electron reflection at W(110)

Angrick

Braun

Ebert

et al. 2020

J. Phys.: Condens. Matter

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Spin-dependent reflection of low-energy electrons at the W(110) surface caused by spin–orbit interaction was studied experimentally and theoretically. Comprehensive information for a wide range of electron incidence angles and energies was collected via maps for the reflectivity, the spin-dependent reflection asymmetry, and the figure of merit of the spin separation. The experimental results are compared with calculations of the scattering process using a realistic surface potential barrier. The results are discussed in view of possible applications of W(110) as a scattering target in spin-polarization detectors. Possible working points for use in single- as well as multi-channel spin-polarization-detection devices are identified and discussed.

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“…For the transition from the surface to vacuum one has to consider the image potential including a specific curve shape. We applied the Rundgren-Malmström barrier, which is known for a successful description of the surface-barrier transition [30,31].…”

Section: Theorymentioning

confidence: 99%

Vectorial spin polarization detection in multichannel spin-resolved photoemission spectroscopy using an Ir(001) imaging spin filter

et al. 2017

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We report on spin-and angular-resolved photoemission spectroscopy using a high-resolution imaging spin filter based on a large Ir(001) crystal enhancing the effective figure of merit for spin detection by a factor of over 10 3 compared to standard single-channel detectors. Furthermore, we review the spin filter preparation and its lifetime. The spin filter efficiency is mapped on a broad range of scattering energies and azimuthal angles. Large spin filter efficiencies are observed for the spin component perpendicular as well as parallel to the scattering plane depending on the azimuthal orientation of the spin filter crystal. A spin rotator capable of manipulating the spin direction prior to detection complements the measurement of three observables, thus allowing for a derivation of all three components of the spin polarization vector in multichannel spin polarimetry. The experimental results nicely agree with spin-polarized low-energy electron diffraction calculations based on a fully relativistic multiple scattering method in the framework of spin-polarized density functional theory.

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Spin-dependent surface barrier from very-low-energy electron diffraction fine structures: A feasibility study

Cited by 7 publications

References 52 publications

Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling

Spin-dependent electron reflection at W(110)

Vectorial spin polarization detection in multichannel spin-resolved photoemission spectroscopy using an Ir(001) imaging spin filter

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