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No.3(pp.73-106)

Home > Issues > Volume 4 (1999) > No.3(pp.73-106)

The Role of Superparamagnetic Particle Size Distribution and Ferromagnetic Phase on GMR in Granular Cu-Co Alloys

Journal of Magnetics, Volume 4, Number 3, 30 Sep 1999, Pages 80-83

M. Kumiski(Institute of Physics, Polish Academy of Science), A.Slawska Waniewska(Institute of Physics, Polish Academy of Science), H. K. Lachowicz(Institute of Physics, Polish Academy of Science)

Abstract

Relations between giant magnetoresistance (GMR) characteristic, magnetic properties and structure were investigated in Cu₉₀Co₁₀ alloy obtained by melt spinning in which GMR was enhanced by appropriate annealing. The structure of the annealed sample is not homogeneous (though the sizes distribution of the majority of Co-particles is not very wide but much larger particles are also present). On the other hand, the GMR characteristics differs from that expected theoretically for identical superparamagnetic particles. It is shown that ther main sources of the observed non-quadratic magnetoresistance dependence on magnetization are differentialted surface to volume ratio of superparamagnetic particles and the ferromagnetic phase contribution to the total magnetization which was calculated applying the new method.

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