Electron correlation effects in the exchange coupling at the Fe/CoO/Ag (001) ferro-/antiferro-magnetic interface

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:529

Article

Sbroscia, M.¹  Verna, A.¹  Stefani, G.^1,2  Vaidya, S. R.^3,4,9  Moroni, R.⁵  Bisio, F.⁵  Iacobucci, S.⁶  Offi, F.¹  Simonucci, S.^7,8  Ruocco, A.¹  Gotter, R.³ 

[1] Univ Roma Tre, Dipartimento Sci, Via Vasca Navale 84, I-00146 Rome, Italy

[2] CNR ISM Ist Struttura Mat, Sede Secondaria Area Ric Montelibretti, I-00015 Monterotondo, Italy

[3] CNR IOM Ist Officina Mat, Area Sci Pk,SS14 Km 163-5, I-34149 Basovizza Trieste, Italy

[4] Univ Trieste, Scuola Dottorato Nanotecnol, Via Valerio 2, I-34127 Trieste, Italy

[5] CNR SPIN Ist Superconduttori Mat Innovativi & Dis, Corso Perrone 24, I-16152 Genoa, Italy

[6] CNR ISM Ist Struttura Mat, Area Ric Tor Vergata, Via Fosso Cavaliere 100, I-00133 Rome, Italy

[7] Univ Camerino, I-62032 Camerino, Italy

[8] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

[9] Southern Connecticut State Univ, Dept Phys, 501 Crescent St, New Haven, CT 06515 USA

关键词: Fe/CoO and Fe/Ag;    Auger Photoelectron Coincidence Spectroscopy;    (APECS);    Electron correlation;    Ferromagnetic/antiferromagnetic interface;    Exchange coupling;    Exchange bias;    Auger spectra of iron;   

DOI  :  10.1016/j.jmmm.2021.167872

来源: Elsevier

【 摘 要 】

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 grown on Ag(001). The effective correlation energy U-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 with the stronger electron confinement and to the exchange coupling between the two layers, respectively.

【 授权许可】

Free