This project is divided into three subjects which are relevant to a perpendicular magnetic recording system: (1) Development of ultra-high density perpendicular magnetic recording media, (2) Development of writing head materials for ultra-high density magnetic recording, (3) Study on read/write system for ultra-high density perpendicular magnetic recording. Main research results are as follows.
| (1) | A CoNiFe soft magnetic thin film with a high saturation magnetic flux density (B6)of 2.1T, which was much higher than that of permalloy, was developed using electroplating. That film was practically adopted by several industries as a writing head core material for high density magnetic recording. Furthermore, CoNiFeB soft magnetic thin films with a high B6, a high electrical resistivity, and a low magnetostriction were developed with electroless plating. |
| (2) | Co/Pd multilayered perpendicular magnetization films with amorphous C or Si underlayer were developed using magnetron sputtering. This media exhibited both excellent magnetic properties and read/write characteristics, namely, a high coercivity, a strong thermal stability, and a low signal to noise ratio. Furthermore, the double-layered perpendicular magnetic recording medium, which consisted of the multilayered perpendicular magnetization film with high magnetic anisotropy and the high B6 CoNiFeB soft magnetic thin films, was proposed as a promising candidate for ultra-high density perpendicular magnetic recording media in the next generation. |
| (3) | A novel read/write system with a ring typed head was proposed for ultra-high density perpendicular magnetic recording. |
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