Spin-polarized field emission from Ni(001) and Ni(111) surfaces

Ohwaki, Tsukuru; Wortmann, Daniel; Ishida, Hiroshi; Blügel, Stefan; Terakura, Kiyoyuki

doi:10.1103/physrevb.73.235424

Cited by 24 publications

(30 citation statements)

References 45 publications

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“…11 More recent theoretical works have also predicted two SSs, which are separated by 180-350 meV. [14][15][16][17] Early ARPES measurements of Ni͑111͒ using lasers revealed two parabolic surface states with upward and downward dispersions at the ⌫ point of the surface Brillouin zone ͑SBZ͒. 13 The spin-split Shockley SSs above E F were studied by the spin-resolved inverse photoemission spectroscopy ͑IPES͒.…”

Section: Introductionmentioning

confidence: 98%

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Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

et al. 2009

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Spin-polarized surface electronic states in Ni͑111͒ have been examined using scanning tunneling microscopy ͑STM͒ and spectroscopy ͑STS͒ combined with high-resolution angle-resolved photoemission spectroscopy ͑HR-ARPES͒. Standing waves derived from the majority-spin Shockley surface state ͑SS͒ have been observed in the STM and dI / dV images. The fast Fourier transform ͑FFT͒-dI / dV image at a different sample bias exhibited a circular contour in the reciprocal space. The radius of the FFT-dI / dV image was in agreement with that of the corresponding constant-energy contour given by the HR-ARPES. The majority-spin Shockley SS is partially occupied and disperses upward, crossing the Fermi level ͑E F ͒ at a wave number of k F = 0.081Ϯ 0.005 Å −1 . The effective mass ͑m ‫ء‬ ͒ with respect to the free-electron mass ͑m e ͒ of the majority-spin Shockley SS was evaluated to be m ‫ء‬ / m e = 0.19Ϯ 0.03. The STS spectrum indicated a pair of the Shockley SS below and above E F with an exchange splitting of ϳ190 meV. By the line-shape analyses of the HR-ARPES spectrum, the lifetime broadening at the ⌫ point was calculated to be 53.6 meV, which agrees well with the width ͑49 meV͒ of the steplike structure in the STS spectrum. The results from the STM/STS and HR-ARPES experiments were found to be mutually consistent.

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Section: Introductionmentioning

confidence: 98%

“…[10][11][12][13][14][15][16][17][18] The exchange-split Shockley surface states were first predicted by a one-step model photoemission calculation. 11 More recent theoretical works have also predicted two SSs, which are separated by 180-350 meV.…”

Section: Introductionmentioning

confidence: 99%

Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

et al. 2009

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“…S 2 , on the other hand, is slightly further away from the Fermi energy and shows a hole-like (downward) dispersion (minimum binding energy ∼250 meV). Recent theoretical work [13][14][15] have shown that both surface states are spin split into two components. In the case of S 1 , only the majority component (the one with the highest binding energy) shows a significant contribution to the electronic spectral weight at the Γ point.…”

Section: Introductionmentioning

confidence: 99%

Hidden surface states on pristine and H-passivated Ni(111): Angle-resolved photoemission and density-functional calculations

et al. 2008

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By means of angle-resolved photoemission, we have uncovered surface related states on the pristine and hydrogen saturated Ni(111) surfaces. Near normal emission spectra were recorded at room temperature as a function of photon energy. A hidden Tamm surface state is found on the clean Ni(111) surface at a binding energy of ~1.19 eV, completely masked by the Lambda1 bulk d band. The existence of this surface state is in agreement with the density-functional theory calculations presented here. On the other hand, a surface state related to hydrogen adsorbed on the surface has been identified at a binding energy of ~0.22 eV. Under hydrogen exposure, it grows at the same rate as the three other surface states of the clean Ni (111)

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“…By contrast, recent first principle calculations have an ability of depicting a physical phenomenon more precisely. As the result, it is predicted that the spin polarization of field emitted electrons from Ni(001) depends on applied electric field, which results from the contribution of a surface state to emission current [4]. However, there are no experimental reports so far on field-dependence of spin polarization of field-emitted electrons.…”

Section: Introductionmentioning

confidence: 94%

Temperature and Emission Current Dependence on Spin Polarization of Field-Emitted Electrons from <110>-Oriented Magnetite Whisker

Nagai

Hata

Okada

et al. 2010

e-J. Surf. Sci. Nanotechnol.

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We investigated the Verwey transition in field-emitted electrons from ⟨110⟩-oriented magnetite whisker through the measurements of spin polarization. On temperature dependences varying tip voltage as a parameter from 850 V to 950 V, a rapid increase of spin polarization around 100 K due to the Verwey transition was observed more clearly with increase of applied voltage. This results indicates that t2g band of Fe3O4 at surface becomes narrower and possesses lower energy than an ideal bulk state.

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Spin-polarized field emission from Ni(001) and Ni(111) surfaces

Cited by 24 publications

References 45 publications

Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

Surface electronic structures of ferromagnetic Ni(111) studied by STM and angle-resolved photoemission

Hidden surface states on pristine and H-passivated Ni(111): Angle-resolved photoemission and density-functional calculations

Temperature and Emission Current Dependence on Spin Polarization of Field-Emitted Electrons from <110>-Oriented Magnetite Whisker

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