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Summary form only given. Noise power spectral density measurements were performed in single strip NiFeCo/Cu GMR sensors for various widths ranging from 2 /spl mu/m to 20 /spl mu/m. Two frequency ranges were used for noise investigations which are from 0.1 Hz to 100 Hz and from 10 Hz to 10 kHz. The power spectrum of the noise was obtained at various bias fields in the absence and presence of an alternating external signal. In order to obtain accurate and repeatable data a program was developed using Labview/sup TM/ to automate the power spectrum measurements.