Spin-orbit coupling in scattering of very low-energy spin-polarized electrons from Co film by (e,2e) spectroscopy

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Abstract

Energy and momentum distributions of correlated electron pairs excited by very low energy (9–30 eV) spin-polarized electrons from a thin Co film on a single crystal of W(110) were detected and analysed. Polarization of the incident electrons was perpendicular to the scattering plane. Spin effects are presented in form of asymmetry A = (I+ − I)/(I+ + I), where I+ and I are two-electron spectra recorded with incident electrons polarization parallel or anti-parallel to the magnetization of the sample, respectively. Performing measurements at two opposite magnetizations of the sample and assuming negligible interference between spin orbit coupling and exchange effect in scattering, two component of asymmetry can be extracted, namely a spin-orbit asymmetry ASO and an exchange asymmetry Aex. The spin-orbit component of the scattering asymmetry was analysed as a function of the primary energy. Contrary to normal expectations the value of spin-orbit asymmetry decreases with increase of the primary energy in the energy range from 9 to 30 eV.

Original languageEnglish
JournalJournal of Electron Spectroscopy and Related Phenomena
DOIs
Publication statusE-pub ahead of print - 22 Nov 2018

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