Münster 1999 – wissenschaftliches Programm

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AM: Magnetismus

AM 10: Postersitzung

AM 10.36: Poster

Dienstag, 23. März 1999, 16:15–20:00, F\"urstenberghaus

Anisotropy studies in granular CoCu-films investigated by ferromagnetic resonance — •R. Meckenstock¹, E. C. da Silva², J. E. Schmidt³, and J. Pelzl¹ — ¹Experimentalphysik III, Ruhr Universität, D-44780 Bochum, Germany — ²Instituto de Fisica, UNICAMP, Campinas, Brazil — ³Instituto de Fisica, UFRGS, Porto Alegre, Brazil

We investigated electron beam co-deposited granular Co₁₀Cu₉₀-Films. These films were tempered for several hours from 100^oC to 350^oC in 25^oC steps and characterized by X-ray and magnetization measurements [1]. These measurements revealed Co grain sizes from 2nm to 4nm and ferromagnetic, superparamagnetic and giant magnetoresistance behaviour depending on the

different tempering Temperatures.
The ferromagnetic resonance investigations revealed an uniaxial in-plane

and out-of-plane anisotropy for samples up to 275^oC due to shape anisotropies in the Co-particles in the Cu matrix. Additionally a in-plane four-fold anisotropy is detected in the as prepared sample which is decreasing in intensity and vanishing in samples tempered at 225^oC. This anisotropy is due to the interaction of the Co-Particles in some parts of the sample. All this confirms the high structural quality of the films. Temperature dependent measurements.
This work is supported by the DLR and CNPq project number BRAL1A6B. [1] A.D.C. Viegas et. al., J. Appl. Phys. 83 (1998), 7007