Other

Industrial Technology Research Institute

National Taiwan University

National Science Council of Republic of China

Ching-ray Chang

Po-Cheng Kuo

An-Cheng Sun

Ching-Ray Chang

Jen-Hwa Hsu

Chih-Ming Kuo

Mei-Rurng Tseng

Chun-Yuan Chou

Song-Yeu Tsai

Shih-Peng Hsu

Wei-Chih Hsu

Tien-Tsan Hung

Fu-Te Yuan

Chih-Shan Tan

Huei-Li Huang

Yen-Hsiang Fang

Tao-Hsuan Yang

A magnetic material includes a main alloy having a rhombohedral crystal structure and a composition represented by CoCuPt, wherein x ranges from 3 to 32, y ranges from 18 to 47, and z ranges from 40 to 60, with the proviso that x+y+z=100. The rhombohedral crystal structure of the main alloy includes a magnetic Co&#x2014;Pt alloy region and a nonmagnetic Cu&#x2014;Pt alloy region.

Magnetic material

A magnetic recording medium is provided in the present invention. The magnetic recording medium including a substrate; a base layer disposed on the substrate; an intermediate layer disposed on the base layer; and a recording layer disposed on the intermediate layer and including a magnetic matrix and a plurality of non-magnetic particles percolated in the magnetic matrix.

Perpendicular magnetic recording medium and method for fabricating the same

A novel heat assisted magnetic recording (HAMR) medium and the fabrication method therefor are provided. The exchange coupling effect occurring at the interface of FePt/CoTb double layers is adopted, and thus the resulting magnetic flux would be sufficient enough to be detected and readout under the room temperature. The provided HAMR medium exhibits a relatively high saturation magnetization and perpendicular coercivity, and thus possesses a great potential for the ultra-high density recording application.

Heat assisted magnetic recording medium and method for fabricating the same

A super-resolution recordable optical disk includes a substrate and forms sequentially on the substrate an under dielectric layer, a mask layer, an interface layer, an organic dye layer, an isolation layer, and a protection layer. A laser beam is projected into the organic dye layer through the substrate to record signals. And a super-resolution recordable optical disk for high numerical apertures also is provided that includes a substrate and forms sequentially on the substrate an organic dye layer, an interface layer, a mask layer an under dielectric layer, and a thin polycarbonate layer. A laser beam is projected into the organic dye layer through the thin polycarbonate layer to record signals.

Super-resolution recordable optical disk

A method of producing high coercivity FePt&mdash;Si,N,granular composite thin films for magnetic recording media is invented. The method includes magnetron co-sputtering of FePt and Si,N,targets at controlled sputtering power and sputtering argon gas pressure to form a selective composition of granular FePt&mdash;Si,N,thin film on a low temperature substrate, then post-annealed in vacuum at selective time period and temperature. Two kinds of FePt targets can be used. One is the FePt alloy target. The other one is a composite target consisting of an iron disk overlaid with small Pt pieces. This arrangement provides a wide range of effective target compositions and therefore film compositions. FePt&mdash;Si,N,films were deposited on natural oxidized silicon wafer or quartz glass substrate at room temperature. The as-deposited film has soft magnetic properties and granular structure with soft magnetic &ggr;-FePt particles dispersed in amorphous Si,N,matrix. The as-deposited film cannot be used as magnetic recording medium due to its low coercivity. After annealing at controlled conditions for a desirable temperature and time period in vacuum, the film also has granular structure but the magnetic soft &ggr;-FePt phase is transformed into magnetic hard &ggr;,-FePt phase. This film has high coercivity and its magnetic easy-axis is parallel to the film plane. It may be used as high-density magnetic recording medium.

Manufacture method of high coercivity FePt-Si3N4 granular composite thin films

A method of producing SiNx protected amorphous Co-Tb thin films with high coercivity for longitudinal and perpendicular magnetic recording media is described. The method includes magnetron sputtering at controlled sputtering power and sputtering argon gas pressure to form a selective composition of amorphous Co-Tb thin film on a low temperature substrate. After the Co-Tb film is deposited, a protective SiNx layer with thickness of 100 .ANG. was produced on the film. The as-deposited film has an amorphous structure with a high value of coercivity, and its magnetic easy-axis is perpendicular to the film plane. This film can be used as a perpendicular magnetic recording medium. After low temperature annealing at controlled conditions for a desirable temperature and time period in vacuum, the film also has an amorphous structure but its magnetic properties are isotropic. This film can be used as a longitudinal magnetic recording medium.

Method of producing amorphous Co-Tb magnetic recording thin films

Growing community of inventors

Taipei, Taiwan

Po-Cheng Kuo