This paper reports the use of CoCrTa/CoCrPtTa using an MR head with gap length 0 32 pm The media noise was double-layer magnetic films to produce low-noise, high-integrated over the frequency range 1 2 to 36 2 MHz The track coercivity recording media. At an optimum thickness ratio, the average amplitude of the isolated pulses was used in the SMNR double layer films can reach higher coercivity (a,) than either of calculation the single-layer films of the above alloys. The signal-to-medianoise ratio of the composite can be a few dB higher than that of the single-layer CoCrPtTa film. Microstructure studies revealed TABLE I DOUBLE LAYER CONFIGURATIONS -~ that the bottom-layer film not only seeds the microstructure for the upper-layer film, but also determines the noise characteristics of the double-layer film. It is suggested that the strain and exchange coupling at the interface of the double-layer films are responsible for the enhancement of H,.
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