Overwrite temperature dependence for magnetic recording

The temperature effect on overwrite (OW) characteristics for magnetic recording, using various heads and media, has been examined. Overwrites depend linearly on the difference (T2−T1) between overwrite temperature T2 and previous recording temperature T1. Their gradients vary from −0.10 to 0.43 dB/deg, depending on head-media combinations. The gradients are proportional to the difference (αBs−αHc), between temperature coefficient for head saturation magnetic flux density Bs and that for media coercivity Hc. Therefore, temperature dependence of overwrite is reduced by selecting a mead-media combination with a small ‖αBs−αHc‖ value. This relation is explained by temperature variation in recording depth.