Tohoku University

Ricoh Company, Ltd.

Toda Kogyo Corporation

Tomoyuki Ogawa

Migaku Takahashi

Itaru Fujimura

Shin Saito

Shigeyoshi Misawa

Toshiyuki Kawasaki

Masakiyo Tsunoda

Naoya Kobayashi

Yasunobu Ogata

Chammika Ruwan Polwatta Gallage

Kaori Kohara

Ferromagnetic particles including an FeNcompound phase in an amount of not less than 80% as measured by M&#xf6;ssbauer spectrum and each having an outer shell in which FeO is present in the form of a film having a thickness of not more than 5 nm. Ferromagnetic particles may be made by subjecting iron oxide or iron oxyhydroxide having an average major axis diameter of 40 to 5000 nm and an aspect ratio (major axis diameter/minor axis diameter) of 1 to 200 as a starting material to dispersing treatment to prepare aggregated particles; subjecting the iron compound particles passed through a mesh to hydrogen reducing treatment at a temperature of 160 to 420&#xb0; C.; and then subjecting the resulting particles to nitridation treatment at a temperature of 130 to 170&#xb0; C.

Ferromagnetic particles and process for producing the same, and anisotropic magnet, bonded magnet and compacted magnet

An information recording apparatus has a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles. Summary information may be recorded for plural information recording parts.

Information recording apparatus and method, information reproducing method and fade-in memory, with summary information corresponding to plurality of information recording elements

An information recording apparatus comprises a plurality of fine particles forming an array on a plane in close proximity of each other, each of the plural particles including a ferromagnetic metal, a light-emitting device for exciting a near-field light, and a photo-electric conversion element for detecting a near-field light traveled along the fine particles.

Information recording method and apparatus using plasmonic transmission along line of ferromagnetic nano-particles with reproducing method using fade-in memory

Growing community of inventors

Miyagi, Japan

Tomoyuki Ogawa