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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:38 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Solid State Physics and Materials Science
Title:
Cu-Co-Fe magnetoresistive thin films deposited by Thermionic Vacuum Arc method
Authors:
Victor CIUPINA (1,2), Iulian PRIOTEASA (2), Daniela ILIE (2), Corneliu POROSNICU (3), Eugeniu VASILE (4), Radu MANU (2)
*
Affiliation:
1) Departament of Physics, Ovidius University of Constanta , Mamaia 124, Constanţa, 900527, România
2) Faculty of Physics, University of Bucharest, Atomiştilor 405, Măgurele, Ilfov
3)National Institute for Lasers, Plasma and Radiation Physics, P.O. Box MG-36, 077125 Bucharest
4)University Politehnica of Bucharest, Faculty of Applied Chemistry and Material Science,Department of Oxide
E-mail
vciupina@yahoo.com
Keywords:
TVA, multilayer, TEM, SEM, EDXS, MOKE, X-Ray Diffraction Technique, GMR.
Abstract:
The purpose of this paper is to investigate morfological and structural properties of nanostructurated multilayers Cu-Co-Fe thin films deposited on silicon substrates. Both magnetic and nonmagnetic materials are used, i. e.,Cu as nonmagnetic matrix, as long as Co and Fe as magnetic matrix alternatively. To obtain such structures was used Thermionic Vacuum Arc (TVA) method, wich ensures a considerable purity of the deposited films. The microstructure and elemental composition of these multilayers films were provided by using electron microscopy techniques (TEM, SEM), Energy Dispersive X-Ray Spectroscopy (EDXS) and X-Ray Diffraction Technique. The experimental analyzes prove the existance of Cu, Co, Fe phases in film but also the existance of the intermetallic compound Fe0.28Co0.72. MOKE measurements confirm the fact that Cu-Co-Fe structures have ferromagnetic properties. In order to perform magnetoresistive measurement, ohmic contacts were attached to the samples. The resistance of the sample was measured in constant current mode by comparison of the potential drop on the sample with the potential drop on a series standard resistance. The magnetic field is oriented perpendicular to the surface of the sample to wich the contacts are attached. The Gigant Magneto-Resistance (GMR) efect appear due to nanoscale efects.
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