抄録
The effect of thermal agitation of magnetization on the magnetic properties of CoCr-based perpendicular recording media was studied using a pulse magnetometer. In media having well-segregated grains, we found that the angular dependence of the “intrinsic” remanence coercivity H0, obtained by subtracting the thermal agitation of magnetization, was nearly the same as that of coherent switching of magnetization calculated by taking account of the angular distribution of the preferred axis. Experimental and theoretical analyses suggested that the achievable maximum value of the ratio of H0 to the anisotropy field Hk is 0.7 to 0.8 at 20-nm thickness. Results show that the value of perpendicular anisotropy Ku must be more than 3 times larger than 2πMs2 values in order to achieve an Mr/Ms of nearly 1.0 resisting the thermal agitation effect in CoCr-based perpendicular media.
