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Structure and magnetic properties of Ni films obtained by pulsed laser ablation deposition

Published online by Cambridge University Press:  31 January 2011

J. Vergara  and
V. Madurga
J. Vergara
Affiliation:
Departamento de Física, Universidad Pública de Navarra, E-31006, Pamplona, Spain
V. Madurga
Affiliation:
Departamento de Física, Universidad Pública de Navarra, E-31006, Pamplona, Spain
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Abstract

Pulsed laser ablation deposition was used to fabricate Ni films. The structure of the as-deposited films is hexagonal (a = 0.267 nm and c = 0.435 nm), and its resistivity is nearly one order of magnitude larger than the resistivity of bulk Ni. No spontaneous magnetization was observed in the as-deposited samples. Annealing above 200 °C induced an irreversible structural transformation from the metastable hexagonal phase to the stable face-centered-cubic (fcc) one. Parallel to this transformation, the magnetic moment of the annealed Ni samples increased, and their resistivity decreased. On annealing at 440 °C, the structural transformation from the hexagonal-close-packed to the fcc phase was completed, and the magnetic moment, Curie temperature, and electrical resistivity of the fcc Ni films were found similar to the ones observed in bulk Ni. A direct correlation between the volume fraction of the fcc Ni phase in our films and their magnetic moment was established.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 2099 - 2104
Copyright
Copyright © Materials Research Society 2002

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