Co-γFe_2O_3/NiO thin-film media for perpendicular and longitudinal magnetic recording

垂直および長手両記録方式に対応可能なCo含有酸化鉄薄膜メディア

Co-γFe_2O_3/NiO thin-film media for perpendicular and longitudinal magnetic recording

Creators Yamamoto Setsuo

Creators Kurisu Hiroki

Creators 松浦 満

Creators 土井 孝紀

Creators 田万里 耕作

A preparation method, magnetic and crystallographic properties, and recording characteristics of Co-γFe_2O_3/NiO thin-film media applicable to both perpendicular and longitudinal magnetic recording are discussed. The easy magnetization direction of the Co-γFe_2O_3 layer can be controlled by selecting an appropriate crystal orientation for the NiO underlayer. The media were prepared in a two-stage process: deposition of a CoO-Fe_3O_4/NiO layer by reactive sputtering in an Ar＋O_2 mixture gas using Ni and CoFe alloy targets, and transformation of CoO-Fe_3O_4/Nio into Co-γFe_2O_3/NiO by plasma oxidization or annealing in air. The specific properties of Co-γFe_2O_3/NiO thin-film media are hardness and chemical stability, low-tem-perature (less than 300℃) fabrication, smooth surface, large magnetic anisotropy (K_u of 1-3X10^6erg/cm_3), widely changeable coercivity (0.7-8kOe), and excellent recording performance. The Co-γFe_2O_3/NiO medium is promising for achieving ultra-high-density recording.

[ISSN]0285-0192

[NCID]AN0031390X

[isVersionOf] [URI]http://www.wdc-jp.com/msj/journal/index.html