EFFECT OF ANISOTROPY-FIELD MAGNITUDE DISTRIBUTION ON SIGNAL-TO-NOISE RATIO

Recording performance is analysed by a micromagnetic model in two thin film media with different distribution width of the anisotropy field magnitude, With the same M-r delta, the magnetic properties of the two media are almost the same except that the switching slope S is large r for the medium with narrower distribution, The signal-to-noise ratio (SNR) is calculated for both media versus recording densities, The SN R at recording densities 4800-9000 flux reversals per millimeter is 5- 8 dB smaller in the medium with a broad anisotropy magnitude distribut ion than the SNR in the medium with a sharp distribution.