Analysis of the spin polarization of secondary electrons emitted from ferromagnetic materials

Sun, Xiaofeng; Ding, Zejun; Yamauchi, Yasushi

doi:10.1002/sia.2136

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…The energy loss accompanying the inelastic scattering process is transferred to the outer layer electrons of the atoms and excited to form the inner secondary electrons [18,19]. When the electrons on the surface cross the interface potential barrier, it forms the emitted secondary electrons [20,21]. Similarly, when electrons interact with adsorbed molecules on the material surface, the transferred energy helps the adsorbed molecules overcome the surface binding energy with direct excitation or de-excitation to generate free gas molecules [22,23].…”

Section: Introductionmentioning

confidence: 99%

Gas Desorption and Secondary Electron Emission from Graphene Coated Copper Due to E-Beam Stimulation

Feng

Song

et al. 2023

Coatings

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The gas desorption and secondary electron multiplication induced by electron bombardment tend to induce severe low-pressure discharge effects in space microwave device cavities. Nevertheless, few studies have focused on both secondary electron emission and electron-stimulated gas desorption (ESD). Although the suppression of secondary electrons by graphene was found to be better in our previous study, it is still unclear whether the surface modification of graphene, which brings about different interfacial states, can also be manifested in terms of ESD. The deep mechanism of gas desorption and secondary electron emission from this extremely thin two-dimensional material under electron bombardment still needs further investigation. Therefore, this paper investigates the mechanism of graphene modification on Cu metal surface on the gas release and secondary electron emission properties under electron bombardment. The surface states of graphene-modified Cu were characterized, and the ESD yield and secondary electron yield of Cu/GoCu were investigated using a self-researched platform and analyzed using molecular dynamics simulations and electron Monte Carlo simulations. The results of the study showed that the most released component on the Cu surface under the bombardment of electrons was H2O molecules, while the most released component on the GoCu surface was H2 molecules. The graphene-modified samples showed a significant suppression effect on the secondary electron yield and ESD only in the low-energy region below 400 eV. This study can provide a valuable reference for suppressing low-pressure discharge and multipactor phenomena in space microwave components.

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Section: Introductionmentioning

confidence: 99%

Gas Desorption and Secondary Electron Emission from Graphene Coated Copper Due to E-Beam Stimulation

Feng

Song

et al. 2023

Coatings

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“…A Monte Carlo simulation is a powerful tool for study of SE generation [20][21][22] ; it is appropriate to investigate the mechanism of the spin polarization of SEs. [12,[23][24][25][26] On the basis of our previous work, [20] a spin-involved Monte Carlo model is developed in this work. The three factors mentioned earlier, that is, spin-dependent cascade electron generation, spin-dependent IMFP, and Stoner excitation, are introduced to this spin-involved Monte Carlo model.…”

Section: Introductionmentioning

confidence: 99%

“…A Monte Carlo simulation is a powerful tool for study of SE generation; it is appropriate to investigate the mechanism of the spin polarization of SEs . On the basis of our previous work, a spin‐involved Monte Carlo model is developed in this work.…”

Section: Introductionmentioning

confidence: 99%

A Monte Carlo study of the spin polarization of secondary electrons

Mao

Sun

Fang

et al. 2012

Surface & Interface Analysis

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A spin-involved Monte Carlo simulation model is developed to study the mechanism of the spin polarization of secondary electrons. The spin-dependent mean free path asymmetry and the Stoner excitation are considered in modeling electron inelastic scattering, and the spin-dependent excitation mechanism of cascade electrons is introduced according to the spin density of the state of a magnetism sample. The simulation has been performed for Ni and Fe. The simulated results, including secondary electron yields, secondary electron energy spectrum, and spin polarization of secondary electrons, are in good agreement with experimental results. According to the present simulation results, it is concluded that the high spin polarization of secondary electrons less than approximately 5 eV is inherently related to the cascade production process of secondary electrons; a more obvious effect of Stoner excitation is found for Ni but not for Fe because of the lack of unoccupied 3d states for spin-majority electrons above the Fermi level for Ni. We have further studied the case that an unpolarized thin layer exists on Fe surface; the results show that the spin polarization of secondary electrons can be greatly affected at low primary energies.

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Analysis of the spin polarization of secondary electrons emitted from ferromagnetic materials

Cited by 2 publications

References 14 publications

Gas Desorption and Secondary Electron Emission from Graphene Coated Copper Due to E-Beam Stimulation

Gas Desorption and Secondary Electron Emission from Graphene Coated Copper Due to E-Beam Stimulation

A Monte Carlo study of the spin polarization of secondary electrons

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