Ultra-high magnetic moment films for write head

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.