Abstract
Experimental characterization of the magnetic anisotropy field of grains Hkgrain and the intergranular magnetic coupling for (Co86Cr12Ta2)100-xPtx thin film media was carriedout by analyses of the magnetic torque and ΔM plot. The magmitude of Hkgrain gradually increases from about 4kOe to about 8kOe with increasing Pt content up to 8 at%, mainlybecause of the increase in magnetocrystalline anisotropy. On the other hand, the ratio of the coercive force Hc to Hkgrain changes from about 0.2 to about 0.3, depending on the Pt content and substrate temperature at the time of the film's fabrication. It was clarfied that the difference of the ratio of Hc to Hkgrain in the examined media depends mainly on the difference in the strength of the intergranular exchange coupling. On the other hand, it is suggested that the knowledge of Hkgrain should be taken into account, in order to clarify how much the intergranular magnetic coupling influences the coercive force through the analysis of the ΔM plot.
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