Abstract-In this paper, the temperature dependence of magnetic and magneto-optic (MO) properties of light rare earth (LRE)-heavy rare earth (HRE)-FeCo / HRE-FeCo has been investigated. The shapes of Kerr hysteresis loops were lead to great changes as temperature varied. The Kerr angles of couple-bilayeredfilms were shown different decreasing tendency as compared to those of single-layered films when temperature was increased. It was found that the exchange-coupled action has a profundly contribution to Kerr angles through the temperature range(-30 0 -1 lOt).
AbsfractThe recording domain sizes of amorphous DyFeCo thin films are compared with those of films with addition of Nd element. It is shown that NdDyFeCo films possess smaller domain sizes than DyFeCo films do under the same recording conditions. These results may be explained by the temperature dependence of coercivity of the thin films. The addition of Nd element to DyFeCo films plays a role of increasing the coercivity of thin films at high temperature , which has influence on the recording domain sizes.
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