CoCrTa垂直磁気記録媒体の磁化の熱擾乱と磁気特性

概要

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The effect of thermal agitation of magnetization on the magnetic properties of CoCrTa/Ti perpendicular media was studied by using a pulse magnetometer. The values of the "intrinsic" remanence coercivity H_o, obtained by subtracting the thermal agitation of magnetization, are several times larger than those of the remanence coercivity H_r measured experimentally at a field sweep rate of 〜5 Oe/s. The value of H_o gradually approaches H_k as the CoCrTa thickness decreases, and shows values larger than 90% of H_k at thicknesses of less than 20 nm. This indicates the potential of perpendicular media to achieve H_r values equal to H_k. The activation volume gradually decreases as the thickness decreases, and is nearly the same as the mean grain volume at esthickness of less than 30 nm. This suggests that magnetization reversal within the grains is uniform at thicknesses of less than 30 nm, even though the grains have an elongated shape (30 nm x 9.5^2 nm^2 at 30 nm thickness, for instance). This will be another advantage of perpendicular media in resisting thermal agitation of magnetization.
社団法人日本磁気学会の論文
2000-04-15