We performed an extended X-ray absorption fine structure (EXAFS) investigation of ultrathin Fe films grown in situ. on Ni(1 0 0) surface. From the first shell analysis of the EXAFS oscillations we obtained values of the bond length, of the effective coordination number and of the Debye-Waller factor that are compatible with a model where there is coexistence of face centred cubic phase (with tetragonal distortion) and of body centred cubic (bcc) phase in the films. We also performed theoretical simulations of the EXAFS data including signals from higher order shells with multiple scattering effects. From these simulations we obtained that the experimental data can be well reproduced with a linear combination of spectra, one reproducing the bulk bcc Fe structure and one obtained by a face centred tetragonal (fct) lattice structure with an interlayer distance d = 1.9 A. In the model the relative weights of the two spectra change with an increasing value for the weight corresponding to the bcc phase. At 20 ML, the weight for the fct phase (30-40%) is still considerable. (C) 2001 Elsevier Science B.V. All rights reserved.

EXAFS analysis of ultrathin Fe films grown on Ni(100) / D'Addato, Sergio; Marassi, L; Luches, P; Gazzadi, Gc; Pasquali, Luca; Verucchi, R; Finetti, P; Nannarone, Stefano. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 487:1-3(2001), pp. 258-266. [10.1016/S0039-6028(01)01104-9]

EXAFS analysis of ultrathin Fe films grown on Ni(100)

D'ADDATO, Sergio;PASQUALI, Luca;NANNARONE, Stefano
2001

Abstract

We performed an extended X-ray absorption fine structure (EXAFS) investigation of ultrathin Fe films grown in situ. on Ni(1 0 0) surface. From the first shell analysis of the EXAFS oscillations we obtained values of the bond length, of the effective coordination number and of the Debye-Waller factor that are compatible with a model where there is coexistence of face centred cubic phase (with tetragonal distortion) and of body centred cubic (bcc) phase in the films. We also performed theoretical simulations of the EXAFS data including signals from higher order shells with multiple scattering effects. From these simulations we obtained that the experimental data can be well reproduced with a linear combination of spectra, one reproducing the bulk bcc Fe structure and one obtained by a face centred tetragonal (fct) lattice structure with an interlayer distance d = 1.9 A. In the model the relative weights of the two spectra change with an increasing value for the weight corresponding to the bcc phase. At 20 ML, the weight for the fct phase (30-40%) is still considerable. (C) 2001 Elsevier Science B.V. All rights reserved.
2001
487
1-3
258
266
EXAFS analysis of ultrathin Fe films grown on Ni(100) / D'Addato, Sergio; Marassi, L; Luches, P; Gazzadi, Gc; Pasquali, Luca; Verucchi, R; Finetti, P; Nannarone, Stefano. - In: SURFACE SCIENCE. - ISSN 0039-6028. - STAMPA. - 487:1-3(2001), pp. 258-266. [10.1016/S0039-6028(01)01104-9]
D'Addato, Sergio; Marassi, L; Luches, P; Gazzadi, Gc; Pasquali, Luca; Verucchi, R; Finetti, P; Nannarone, Stefano
File in questo prodotto:
File Dimensione Formato  
SurfSci_EXAFS_FeNi_2001.pdf

Accesso riservato

Descrizione: Articolo principale
Tipologia: Versione pubblicata dall'editore
Dimensione 242.21 kB
Formato Adobe PDF
242.21 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/6444
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 4
  • ???jsp.display-item.citation.isi??? 4
social impact