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Magnetoresitive properties were investigated for Co9Fe/Cu/Co9Fe sandwiches with a 21A Cu layer thickness and different Co9Fe layer thicknesses which were prepared on a MgO (110) substrate using ion beam sputter deposition. The influence of a 50A Fe buffer was also investigated. In-plane uniaxial magnetic anisotropy (Ku) in addition to cubic anisotropy (K1) was induced, of which the easy axis was along MgO (001) and MgO [110] without and with a 50A Fe buffer layer, respectively. The magnetoresitance (MR) ratio monotonically decreased with increasing Co9Fe layer thickness in the investigated thickness range of 25 to 70A. The maximum value obtained was 11.5% at room temperature. With increasing field the MR saturated with a gentle slope after a steep drop at a small field without an Fe buffer layer, but rapidly saturated at a small field with an Fe buffer. These behaviours can be understood by magnetization processes taking into account both Ku and K1.

Giant Magnetoresitance and Magnetic Anisotropy in Co<sub>9</sub>Fe/Cu/Co<sub>9</sub>Fe Sandwiches on a MgO (110) Substrate