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Exchange coupling and giant magnetoresistance in magnetic multilayered structures

T. PETRISOR Jr1,* , M. S. GABOR1, C. V. TIUSAN2

Affiliation

  1. Technical University of Cluj-Napoca Str. C-tin Daicoviciu, Nr. 15, 400020 Cluj-Napoca, Romania
  2. Université « H. Poincaré » Nancy I, Faculté des Sciences, France Boulevard des Aiguillettes B.P. 239, F-54506 VANDOEUVRE LES NANCY Cedex France

Abstract

Our paper presents different magnetic multilayered systems, that were fabricated in order to allow the study of the giant magnetoresistance (GMR) effect and of the magnetic coupling of two ferromagnetic layers separated by a non-magnetic one. Study the GMR response alone, we have developed a structure based on the Co/Cu/Fe tri-layer system. Due to the difference in coercive fields, Hc, of Co and Fe, we were able to stabilize both a parallel and an anti-parallel configuration of the magnetizations of the two layers, thus being able to observe the GMR response of the structure. As far as the study of the exchange coupling of ferromagnetic films is concerned, we used the Co/Ru/Co systems, with varying thicknesses of the Ru layer. An optimum of 8Å for the Ru layer was obtained for the antiferromagnetic coupling of the Co layers. Also, a hybrid Co/Ru/Co/Cu/Fe structure was fabricated, in which we show the way the coupled layers modulate the GMR response of the entire structure..

Keywords

Magnetic multilayers, Giant magnetoresistance, Interlayer exchange coupling.

Submitted at: Nov. 5, 2008
Accepted at: Dec. 10, 2008

Citation

T. PETRISOR Jr, M. S. GABOR, C. V. TIUSAN, Exchange coupling and giant magnetoresistance in magnetic multilayered structures, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3332-3335 (2008)