Difference in the behaviour of interfacial Co and Ni atoms in CoxNi1-x/Pt multilayers : an explanation
Identifieur interne : 000163 ( Maroc/Analysis ); précédent : 000162; suivant : 000164Difference in the behaviour of interfacial Co and Ni atoms in CoxNi1-x/Pt multilayers : an explanation
Auteurs : M. Seddat [France] ; M. Tessier [France] ; R. Krishnan [France] ; H. Lassri [Maroc] ; S. Visovsky [République tchèque] ; S. K. Kulkarni [Inde] ; M. Vedpathak [Inde]Source :
- Journal of physics. D. Applied physics [ 0022-3727 ] ; 2000.
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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 difference in the behaviour of interfacial Co and Ni atoms. While the magneto-optic enhancement in the Kerr spectra is observed for the whole range of 0 < x < 1 the enhancement in the magnetization arising from the spin polarization 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 moment on Pt by polarization effects.
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Seddat</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Magnétisme et d'Optique, UVSQ - CNRS, 45, Avenue des Etats Unis</s1><s2>78035 Versailles</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Versailles</settlement></placeName></affiliation></author><author><name sortKey="Tessier, M" sort="Tessier, M" uniqKey="Tessier M" first="M." last="Tessier">M. 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Applied physics</title><title level="j" type="abbreviated">J. phys., D, Appl. phys.</title><idno type="ISSN">0022-3727</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Binary alloys</term><term>Charge transfer</term><term>Cobalt alloys</term><term>Experimental study</term><term>Ferromagnetism</term><term>Kerr magneto-optical effect</term><term>Magnetization</term><term>Multilayers</term><term>Nickel alloys</term><term>Photoelectron spectroscopy</term><term>Platinum</term><term>Quantity ratio</term><term>Spin polarization</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term><term>Multicouche</term><term>Aimantation</term><term>Effet Kerr magnétooptique</term><term>Effet concentration</term><term>Transfert charge</term><term>Ferromagnétisme</term><term>Polarisation spin</term><term>Spectrométrie photoélectron</term><term>Cobalt alliage</term><term>Nickel alliage</term><term>Platine</term><term>Alliage binaire</term><term>Alliage CoNi</term><term>Pt</term><term>Co Ni</term><term>7570C</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Platine</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Magnetization at 5 K and polar Kerr spectra in Co<sub>x</sub>Ni<sub>1-x</sub>/Pt multilayers were studied as functions of Co content in order to better understand the difference in the behaviour of interfacial Co and Ni atoms. While the magneto-optic enhancement in the Kerr spectra is observed for the whole range of 0 < x < 1 the enhancement in the magnetization arising from the spin polarization 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 moment on Pt by polarization effects.</div></front></TEI><affiliations><list><country><li>France</li><li>Inde</li><li>Maroc</li><li>République tchèque</li></country><region><li>Bohême centrale</li><li>Île-de-France</li></region><settlement><li>Prague</li><li>Versailles</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Seddat, M" sort="Seddat, M" uniqKey="Seddat M" first="M." last="Seddat">M. Seddat</name></region><name sortKey="Krishnan, R" sort="Krishnan, R" uniqKey="Krishnan R" first="R." last="Krishnan">R. Krishnan</name><name sortKey="Tessier, M" sort="Tessier, M" uniqKey="Tessier M" first="M." last="Tessier">M. Tessier</name></country><country name="Maroc"><noRegion><name sortKey="Lassri, H" sort="Lassri, H" uniqKey="Lassri H" first="H." last="Lassri">H. Lassri</name></noRegion></country><country name="République tchèque"><region name="Bohême centrale"><name sortKey="Visovsky, S" sort="Visovsky, S" uniqKey="Visovsky S" first="S." last="Visovsky">S. Visovsky</name></region></country><country name="Inde"><noRegion><name sortKey="Kulkarni, S K" sort="Kulkarni, S K" uniqKey="Kulkarni S" first="S. K." last="Kulkarni">S. K. Kulkarni</name></noRegion><name sortKey="Vedpathak, M" sort="Vedpathak, M" uniqKey="Vedpathak M" first="M." last="Vedpathak">M. Vedpathak</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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