Difference in the behaviour of interfacial Co and Ni atoms in CoxNi1-x/Pt multilayers: an explanation

Citation
M. Seddat et al., Difference in the behaviour of interfacial Co and Ni atoms in CoxNi1-x/Pt multilayers: an explanation, J PHYS D, 33(14), 2000, pp. 1662-1665
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS D-APPLIED PHYSICS
ISSN journal
0022-3727 → ACNP
Volume
33
Issue
14
Year of publication
2000
Pages
1662 - 1665
Database
ISI
SICI code
0022-3727(20000721)33:14<1662:DITBOI>2.0.ZU;2-X
Abstract
Magnetization at 5 K and polar Kerr spectra in CoxNi1-x/Pt multilayers were studied as functions of Co content in order to better understand the diffe rence in the behaviour of interfacial Co and Ni atoms. While the magneto-op tic enhancement in the Kerr spectra is observed for the whole range of 0 < x < 1 the enhancement in the magnetization arising from the spin polarizati on of Pt occurs only for x > 0.3 indicating that Pt atoms are not polarized by the Ni atoms. The x-ray photoelectron spectroscopy experiments indicate that there is charge transfer from Pt to 3d bands of Ni at the interface, leading to the loss of ferromagnetism in Ni. Therefore, non-magnetic Ni is not able to polarize Pt and induce a moment. In contrast, in the case of Co , no charge transfer is seen and Co remains ferromagnetic and induces a mom ent on Pt by polarization effects.