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Proceedings Paper

Improvement of giant magnetoresistance in Ag/Co multilayers by excimer laser processing
Author(s): Eva Majkova; M. Spasova; Stefan Luby; Matej Jergel; R. Senderak; Emilia D'Anna; Armando Luches; Maurizio Martino; Michel Brunel; A. Pokhila
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Paper Abstract

Ag/Co multilayers (MLs) showing the giant magnetoresistance (GMR) were prepared by electron beam evaporation in UHV apparatus. The samples were thermally processed by XeCl excimer laser at the fluences F equals 0.1, 0.15 and 0.2 Jcm-2 and number of pulses between 1 and 200. The samples were analyzed by X-ray diffraction (XRD) and grazing incidence (GI)XRD. The electrical resistance R(H,T) was measured up to 50 kOe with magnetic field perpendicular or parallel to the film plane and with current in plane of the multilayers from 4.2 K to 300 K. Four different types of MLs were studied. In one of them (2 nm Ag/l nm Co)x5, Ag layers melt under laser irradiation according to our numerical computations and the change of GMR is non-systematic. In the other MLs (6 nm Ag/l nm Co)x5, the Ag and Co layers don't melt and the GMR improvement vs. deposited laser energy is systematic. This effect is ascribed to the transformation of continuous Co layer into discontinuous one with larger interfacial area between non-magnetic and magnetic components in the ML. The temperature dependence of the magnetic contribution responsible for GMR (Rm) obeys the power law Rm approximately -Tn with n changing from 0.89 to 1.3 for various MLs in as-deposited and irradiated state.

Paper Details

Date Published: 26 May 1998
PDF: 6 pages
Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); doi: 10.1117/12.308620
Show Author Affiliations
Eva Majkova, Institute of Physics (Slovak Republic)
M. Spasova, Institute of Physics (Slovak Republic)
Stefan Luby, Institute of Physics (Slovak Republic)
Matej Jergel, Institute of Physics (Slovak Republic)
R. Senderak, Institute of Physics (Slovak Republic)
Emilia D'Anna, Univ. degli Studi de Lecce and Istituto Nazionale di Fisica della Materia (Italy)
Armando Luches, Univ. degli Studi di Lecce and Istituto Nazionale di Fisica della Materia (Italy)
Maurizio Martino, Univ. degli Studi di Lecce and Istituto Nazionale di Fisica della Materia (Italy)
Michel Brunel, Lab. de Crystallographie/CNRS (France)
A. Pokhila, B.I. Verkin Institute for Low Temperature Physics and Engineering (Ukraine)

Published in SPIE Proceedings Vol. 3404:
ALT'97 International Conference on Laser Surface Processing
Vladimir I. Pustovoy, Editor(s)

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