Magneto-optical recording medium

摘要

In a magnetic recording medium, at least first, second and third magnetic layers are laminated in succession, and when the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the first magnetic layer at a temperature T represented by cgs unit system are defined as sigma 1, Ms1, Hw1 and h1, respectively, and the magnetic wall energy density, saturation magnetization, magnetic wall coercivity and film thickness of the third magnetic layer are defined as sigma 3, Ms3, Hw3 and h3, respectively, and the interface magnetic wall energy density between the first magnetic layer and the third magnetic layer is defined as sigma w13, and the lowest temperature at which sigma w13 is 0 erg/cm<2> is Ts, at least at room temperature, $and$ are\; satisfied,\; and\; when\; a\; suitable\; temperature\; Tp\; is\; chosen,\; to\; a\; temperature\; range\; greater\; than\; the\; temperature\; Ts\; and\; lower\; by\; 10\; DEG\; C\; or\; more\; than\; the\; Curie\; temperature\; Tc1\; of\; the\; first\; magnetic\; layer,\; within\; a\; temperature\; range\; of\; at\; least\; Ts\; to\; Tp,$ and$ are\; satisfied,\; where$ $ \mathop{\mathrm{image}}$$$$$$