Improvement of giant magnetoresistance in Ag/Co multilayers by excimer laser processing

Eva Majkova; M. Spasova; Stefan Luby; Matej Jergel; R. Senderak; Emilia D'Anna; Armando Luches; Maurizio Martino; Michel Brunel; A. Pokhila

doi:10.1117/12.308620

26 May 1998 Improvement of giant magnetoresistance in Ag/Co multilayers by excimer laser processing

Eva Majkova, M. Spasova, Stefan Luby, Matej Jergel, R. Senderak, Emilia D'Anna, Armando Luches, Maurizio Martino, Michel Brunel, A. Pokhila

Author Affiliations +

Proceedings Volume 3404, ALT'97 International Conference on Laser Surface Processing; (1998) https://doi.org/10.1117/12.308620
Event: ALT '97 International Conference on Laser Surface Processing, 1997, Limoges, France

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 (R_m) obeys the power law R_m approximately -Tⁿ with n changing from 0.89 to 1.3 for various MLs in as-deposited and irradiated state.

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Eva Majkova, M. Spasova, Stefan Luby, Matej Jergel, R. Senderak, Emilia D'Anna, Armando Luches, Maurizio Martino, Michel Brunel, and A. Pokhila "Improvement of giant magnetoresistance in Ag/Co multilayers by excimer laser processing", Proc. SPIE 3404, ALT'97 International Conference on Laser Surface Processing, (26 May 1998); https://doi.org/10.1117/12.308620

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