The dependence of the giant magnetoresistance (GMR) on the thickness of the Co layers in Co/Cu multilayers was investigated experimentally. The thickness of the Cu layer was held constant at tCu=19 Å, which corresponds to the second maximum of the GMR ratio oscillating dependence on tCu. The Co layer thickness was varied from 4.8 to 79.0 Å. High resolution transmission electron microscopy showed the existence of the two-dimensional artificial superstructure with defined periodicity as well as sharp and flat interfaces. From wide angle x-ray diffraction it was concluded that at Co layer thickness below 40 Å the multilayers are polycrystalline with mainly fcc lattice structure and (111) texture. In the case of thicker Co layers indications of hcp Co could be found. The GMR ratio reaches a maximum at Co layer thickness about 11 Å. It was shown that the GMR in sputtered Co/Cu multilayers is due to spin scattering at the interfaces and resistance is strongly influenced by interface scattering.
If a DC magnetic field is applied parallel to the plane of amorphous CoZr(RE) thin films during sputter depositing, uniaxial anisotropy is formed the direction of which depends upon the choice of RE substituted and its concentration. When RE = Gd a perpendicular anisotropy Kp forms over a large concentration range, a spin reorientation process being at the origin of the process. A well-defined Kp is developed also in CoFeZrGd and CoZrGdSm films. CoZrGdDy films exhibit simultaneously a perpendicular and an in-plane uniaxial anisotropy. The related magnetization process and domain structures are quite peculiar.
of Maieriolr So. & Eng , Sfoie Uniuersrry of N6.w York ai Stony Brook Stony Brvok NY 11794-2275 USAlotmduetion Exchange spring magnets have been proposed'" to make permanent magnets of composite materials consking of two dil€erent p k s , a suitably dlspcrxd hard magnetic phase in a soA mgneiic matrix. The hard magnetic phase prondes a high coercivity. while the sofl phase provides a high saturation magnetization. In this study, we use SrFe,j0~ (SF) as the hard magnetic phase and compare the exchange couplmg m the systems FeJST"' and NYSF.
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