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By using a novel NiFeCr buffer layer, a substantial improvement in a GMR ratio of 4.5% with a low saturation field of 19 Oe was obtained. The structure of all GMR multilayers was glass/NiFeCr[5 nm]/NiFe[1.7 nm]/(CuNi[2.3 nm]/NiFe[1.7 nm])3/Cr[2 nm]. The change in sheet resistance was 0.8 Ohms/square. Magnetoresistances, current density effects and transfer curves for 2, 1, and 0.5 micron trackwidth GMR sensors of these structures are described. At a trackwidth of 0.5 /spl mu/m, maximum field sensitivity of 215 /spl mu/m V/Oe was obtained with a sensor length of 2 /spl mu/m, a sense current of 3 mA. No degradation in magnetoresistance of sheet CMR was found after annealing at 270/spl deg/C. However, sensor-size dependent thermal degradation was observed.
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Mizuguchi et al. (1998) studied this question.
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