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Thickness Dependence of the Ferromagnetism of Pd Films

Published online by Cambridge University Press:  26 February 2011

S. Bouarab ,
C. Demangeat ,
A. Mokrani  and
H. Dreysse
S. Bouarab
Affiliation:
IPCMS, Université Louis-Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg, France
C. Demangeat
Affiliation:
IPCMS, Université Louis-Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg, France
A. Mokrani
Affiliation:
Laboratoire de Physique du Solide, 2, rue de la Houssinière, 44072 Nantes
H. Dreysse
Affiliation:
Laboratoire de Physique du Solide, BP239, 54506 Vandoeuvre-les Nancy
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Abstract

We report the electronic structure of Pd(001) films with various thicknesses, within a self-consistent real-space description of the Hubbard Hamiltonian. We point out that the onset of ferromagnetism in Pd films is not a surface effect, but is directly related to the thickness of the slab: when the lattice parameter increases, films of two or three planes become ferromagnetic. Films with increasing thicknesses (from five layers to the bulk size) need a greater increase of the lattice parameter. An important supplementary lattice expansion is necessary to obtain a free-standing ferromagnetic monolayer. The surprising experimental results of Pd films on Ag or Fe substrate, are well described within this framework.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 231: Symposium S – Magnetic Surfaces, Thin Films and Multilayers , 1991 , 317
Copyright
Copyright © Materials Research Society 1992

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