Eur. Phys. J. B 10, 555-562 (1999)
https://doi.org/10.1007/s100510050886

Tetragonal structure of thin nickel films on Cu(001)

¹ Laboratoire pour l'Utilisation du Rayonnement Électromagnétique, Université Paris-Sud, Bâtiment 209d, B.P. 34, 91898 Orsay Cedex, France
² Commissariat à l'Énergie Atomique, Service de Recherche sur les Surfaces et l'Irradiation de la Matière, 91191 Gif-sur-Yvette Cedex, France

Corresponding author: ^a plefevre@lure.u-psud.fr

Received: 22 December 1998
Published online: 15 August 1999

Abstract

The crystallographic structure of thin Ni films deposited on Cu(001) has been studied using Surface Extended X-ray Absorption Fine Structure (SEXAFS). Taking advantage of the linear polarization of the synchrotron radiation, we have shown that Ni adopts the Cu lattice parameter parallel to the interface. This lateral expansion induces a longitudinal compression of the unit cell, leading to a face centered tetragonal structure of the Ni films from 3 to 10 monolayers. The temperature dependence of the EXAFS oscillations has allowed to measure strain inside the Ni layers.