AC バイアス・ディジタル磁気記録の基礎的性質

概要

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The amplitude and pulse width of isolated read signal from AC-biased digital magnetic recording were examined and the results were compared to the behavior of medium residual flux. The combination of write signal and ac-bias current level (I_w, I_b) divides write operation range of magnetization into three regions : initial magnetization, over-bias demagnetization and over saturation regon. In initial magnetization and over saturation region, amplitude and pulse width of isolated read signal are both determined by the sum of I_w and I_b; whereas in over-bias demagnetization region, read signal amplitude follows I_w/I_b ratio. The characteristics of read signal amplitude versus write density were also examined. Half ampolitude density D_<50> was compared to half width of isolated pulse W_<50>. The inverse-proportionality between D_<50> and W_<50> was ascertained.
山口大学の論文