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Novel magnetic materials with ultra-high magnetic moment are presented. The Fe70Co30 alloy is known to have the highest saturation magnetization of 2.45 T in nature. On the other hand, sputtered Fe70Co30:Pd and [Fe70Co30/Pd]n super-lattice films revealed higher saturation magnetization of 2.49 and 2.57 T at room temperature, respectively, while that of a Fe70Co30 single-layered film was 2.38 T. These values seemed to be acceptable of a main pole material of the write head in the hard-disk drive with an areal recording density above 160 Gbits/in2. In addition, these films can be synthesized using a conventional sputtering apparatus as same as a Fe70Co30 films. Therefore, these films will promise a feasible way for the increase of an areal recording density without any additional technologies, such as a heat assisted recording, contact recording, or further development of the media.
Date of Publication: Feb. 2006