Summary of Research Project Results under JSPS FY2001
"Research for the Future Program"

1.Research Institution Waseda University
2. University-Industry Cooperative Research Committee
 144th Committee on Magnetic Recording
3.Term of Project FY 1997 〜 FY 2001
4.Project Number 97R14401
5.Title of Project Advanced Research and Development on High Density Magnetic Recording Device by Means of Atomic Interface Design

6.Projetct Leader
Name Institution,Department Title of Position
Tetsuya Osaka Waseda University,School of Science and Engineering Professor

7.Core Members

Names Institution,Department Title of Position
Takayuki Homma Waseda University, School of Science and Engineering Associate Professor
Jiro Hokkyo Waseda University, Advanced Research Institute for Science and Engineering Visiting Professor

8.Summary of Research Results

  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.

9.Key Words

(1)High density magnetic recording (2)Perpendicular magnetic recording media
(3)Writing head materials for ultra-high density magnetic recording
(4)Electoplanting (5)Electroless plating (6)Magnetron sputtering
(7)High B6 CoNiFe soft magnetic thin films (8)Co/Pd multilayered perpendicular magnetization films