1. Electron correlation effects in the exchange coupling at the Fe/CoO/Ag(001) ferro-/antiferro-magnetic interface
- Author
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Francesco Offi, S. R. Vaidya, Giovanni Stefani, Stefano Simonucci, Adriano Verna, Alessandro Ruocco, Riccardo Moroni, Marco Sbroscia, S. Iacobucci, Roberto Gotter, Francesco Bisio, Sbroscia, M., Verna, A., Stefani, G., Vaidya, S. R., Moroni, R., Bisio, F., Iacobucci, S., Offi, F., Simonucci, S., Ruocco, A., and Gotter, R.
- Subjects
Materials science ,FOS: Physical sciences ,02 engineering and technology ,7. Clean energy ,01 natural sciences ,Condensed Matter - Strongly Correlated Electrons ,Condensed Matter::Materials Science ,0103 physical sciences ,Antiferromagnetism ,Ferromagnetic/antiferromagnetic interface ,010306 general physics ,Spectroscopy ,Spin (physics) ,Condensed matter physics ,Electronic correlation ,Strongly Correlated Electrons (cond-mat.str-el) ,Exchange interaction ,Auger Photoelectron Coincidence Spectroscopy (APECS) ,Electron correlation ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,3. Good health ,Electronic, Optical and Magnetic Materials ,Exchange coupling ,Exchange bias ,Ferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology ,Valence electron ,Auger spectra of iron ,Fe/CoO and Fe/Ag, Auger Photoelectron Coincidence Spectroscopy (APECS), Electron correlation, Ferromagnetic/antiferromagnetic interface Exchange coupling, Exchange bias, Auger spectra of iron ,Fe/CoO and Fe/Ag - Abstract
Angle resolved-Auger-photoelectron coincidence spectroscopy (AR-APECS) has been exploited to investigate the role that electron correlation plays in the exchange-coupling at the ferromagnetic/antiferromagnetic interface of a Fe/CoO bilayer growth on Ag(001). The effective correlation energy U$_{\textrm{eff}}$, usually employed to assess the energy distribution of core-valence-valence Auger spectra, has been experimentally determined for each possible combination of the orbital (e$_g$ or t$_{2g}$) and the spin (majority or minority) of the two valence electrons involved in the Auger decay. Coulomb and exchange interactions have been identified and compared with the result obtained on the Fe/Ag system. The presented analysis reveals in the Fe/CoO interface an enhancement of the Coulomb interaction for the e$_g$ orbital and of the exchange interaction for the t$_{2g}$ orbital with respect to the Fe/Ag case that can be associated to the stronger electron confinement and to the exchange coupling between the two layers, respectively., Comment: 37 pages, 6 figures
- Published
- 2020
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