Anisotropy of spin-orbit interaction in W(110) by spin-polarized two-electron spectroscopy

Samarin, Sergey; Artamonov, O.M.; Sergeant, Anthony; Williams, James

doi:10.1103/physrevb.72.235419

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…Using spin-polarized incident electrons we were able to study the spin effects in the generation of electron pairs [20,21,22]. The spin effects were demonstrated by constructing the asymmetry of (e,2e) spectra defined as:…”

Section: Excitation Of Electron Pairs From a Cu Surfacementioning

confidence: 99%

Emission of correlated electron pairs from Au(111) and Cu(111) surfaces under low-energy electron impact: Contribution of surface states, d-states and spin effects

Samarin

Artamonov

Guagliardo³

et al. 2015

Journal of Electron Spectroscopy and Related Phenomena

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The emission of correlated electron pairs excited from surfaces of Au(111) and Cu(111) by low-energy electrons is measured and analyzed. Energy and momentum conservation allows identification of electron pairs involving excitation of electrons from Shockley surface states and from valence d-states. The relative contributions of surface and d-states to the measured spectra of correlated electron pairs is shown to depend on the primary electron energy and is larger from surface states at relatively small primary energies. The use of a spin-polarized incident electron beam highlights the spin effects in producing an electron pair. Measurements show that spin effects are larger for the pair excitation from the valence d-states than for pairs excited from the surface states.

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Section: Excitation Of Electron Pairs From a Cu Surfacementioning

confidence: 99%

Emission of correlated electron pairs from Au(111) and Cu(111) surfaces under low-energy electron impact: Contribution of surface states, d-states and spin effects

Samarin

Artamonov

Guagliardo³

et al. 2015

Journal of Electron Spectroscopy and Related Phenomena

Self Cite

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“…It was reported recently [8] that a secondary emission spectrum excited by spin-polarized electrons from W(110) exhibits intensity asymmetry as a function of electron energy. Spin-polarized two-electron spectroscopy unraveled the anisotropy of SOI in W(110) [9].…”

Section: Spin-orbit Interaction On W(110) Surfacementioning

confidence: 99%

Low-energy spin-polarized two-electron spectroscopy: a powerful tool for studying exchange correlation and spin-orbit interaction on surfaces

Samarin

Artamonov

Sergeant

et al. 2008

J. Phys.: Conf. Ser.

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Spin-polarized two-electron spectroscopy-in-reflection has been proven to be a very efficient technique for studying the exchange correlation and spin-orbit interaction on magnetic and non-magnetic surfaces and thin ferromagnetic films. The essence of the technique is the detection of two time-correlated electrons emitted from the sample surface upon an impact of a single incident electron and measurements of their momenta. The coincidence technique has been combined with a time-of-flight electron energy analysis to measure momentum distributions of correlated electron pairs for various orientations of the electron beam polarization relative to the scattering plane and magnetization of the sample. This set of measurements allows to extract the information on exchange correlation and spin-orbit interaction from measured spectra. Energy-and momentum-conservation in the electron-electron scattering allows the valence electron involved into collision to be located in the energy-momentum space of the valence band of the sample. In this way the energy and momentum location of the exchange and SOI can be established. A few examples of the application of this technique for studying ferromagnetic and non-magnetic surfaces are presented.

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“…For nonmagnetic surfaces, this was first demonstrated by numerical calculations for the large-Z surface W(001) 19 and subsequently confirmed by experiment. 20,21 For ferromagnetic surfaces appreciable SOC effects have been found experimentally for an ultrathin Co film on W(110). [22][23][24] While SOC is fairly weak for Co (Z = 27), the substrate W(110) with its large Z = 74 affects the electronic states of the combined system such that the SOC-induced intensity asymmetry A so upon reversal of the spin of the primary electrons reaches about the same size as its exchange-induced counterpart A ex .…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit effects in two-electron emission from ferromagnetic surfaces

2013

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In previous experiments on electron-induced two-electron emission from the ferromagnetic surface system Co/W(110), spin-orbit coupling effects have been observed, which are comparable in size to the magnetic exchange effects. The present theoretical work aims at a detailed understanding of such effects, in particular their relation to the spin-dependent electronic structure and to collision dynamics. To this end, we have developed a formalism, which is based on a Dirac equation with an effective magnetic field. Magnetic exchange and spin-orbit coupling are thus incorporated simultaneously. Typical numerical two-electron emission results are presented for W(110) and for ultrathin Co films on W(110) together with the underlying spin-and layer-resolved valence electron spectral density. More detailed insight is provided by calculations, in which SOC was selectively switched off for the valence electron and for the primary and emitted electrons. Our theoretical results are in overall agreement with the experimental data. Furthermore, we predict sizable magnetic dichroism.

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Anisotropy of spin-orbit interaction in W(110) by spin-polarized two-electron spectroscopy

Cited by 10 publications

References 19 publications

Emission of correlated electron pairs from Au(111) and Cu(111) surfaces under low-energy electron impact: Contribution of surface states, d-states and spin effects

Emission of correlated electron pairs from Au(111) and Cu(111) surfaces under low-energy electron impact: Contribution of surface states, d-states and spin effects

Low-energy spin-polarized two-electron spectroscopy: a powerful tool for studying exchange correlation and spin-orbit interaction on surfaces

Spin-orbit effects in two-electron emission from ferromagnetic surfaces

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