Abstract
Some noise characters were measured for MP tapes of different particle size at different packing fraction which is controlled by diluting with nonmagnetic powder, /spl alpha/-Fe/sub 2/O/sub 3/. We employed /spl delta/M as an indication of magnetic interaction. /spl delta/M reduced with decreasing packing fraction. The reduction was much larger for the 0.10 /spl mu/m particle than the 0.25 /spl mu/m particle. This result suggests that the 0.10 /spl mu/m particle and the 0.25 /spl mu/m particle have different structures, which was confirmed by using a dark-field microscope. The tape using the 0.10 /spl mu/m particle had a higher AC erase noise than DC erase noise because of high magnetization and high coercive force. Conversely, AC erase noise was lower than DC erase noise for the 0.25 /spl mu/m particle. AC erase noise could be decreased by diluting with a nonmagnetic powder for the 0.10 /spl mu/m particle. The shoulder noise of the signal was also decreased by diluting and the reduction was twice that of output reduction. A plausible explanation for the noise reduction is the clearness of the border on the recording pattern, and this was confirmed with MFM. From the result of angular dependence of H/sub c/, it is suggested that the magnetic reversal mode changes with packing fraction for the 0.10 /spl mu/m particle, and this conversion may affect tape noise characteristics.
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