| 摘要 |
PROBLEM TO BE SOLVED: To attain high-density and high-frequency recording without changing a recording head material and specifically reducing the distance between a magnetic head and a magnetic recording medium and without deteriorating the overwriting characteristic of the magnetic recording medium, the magnetic head and a recording and reproducing amplifier. SOLUTION: The design of a magnetic memory device is executed in such a manner that the various parameters determined by the magnetic head, the magnetic recording medium, recording amplifier, etc., satisfy the following equation 1, equation 2 or equation 3: v×(tr +tf )/2<=L (1) v×(tr +tf )<=2π×Br×tmag / Hc (2) fw <=1/(tr +tf ) (3). In the equations, (v) is the relative speed (m/sec) between the head and the medium; tr is the rising time (sec) of the recording current, tf is the falling (sec) of the recording current; L is the magnetization inversion width on the medium; Br is the residual magnetic flux density (Gauss) of the magnetic recording medium; tmag is the magnetic film thickness (m) of the magnetic recording medium; Hc is the coercive force (Oe) of the magnetic recording medium; fw is a recording and reproducing frequency (Hz).
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