Patterned media is a promising candidate for high density magnetic recording media because it can improve thermal stability. We have developed a new fabrication method for patterned media which uses nano-imprint lithography and a self-assembled diblock copolymer mask. An artificially controlled 80nm-pitch CoCrPt dot array was fabricated over the entire surface of a 2.5 inch disk substrate [1]. Etching damage to the magnetic dots caused by the ion milling process was estimated to be small due to employment of optimum etching conditions [2]. In the present study, the magnetization reversal process of CoCrPt patterned media by a ring head was investigated. The media consists of two rows of aligned CoCrPt dots with a diameter of 40nm. The magnetized state and magnetic properties were analyzed by a magnetic force microscopy (MFM) in the presence of a magnetic field.
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