The University of Tokyo

Dowa Electronics Materials Co., Ltd.

Waka Tarora

Takayuki Yoshida

Shin-ichi Ohkoshi

Asuka Namai

Manabu Tanaka

Hiroko Tokoro

Marie Yoshikiyo

Tomomichi Nasu

A magnetic &#x3c3;-form iron oxide nanopowder is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process produces the magnetic nanopowder. The magnetic powder has a composition represented by FeOand has a crystal structure belonging to the monoclinic system.

Magnetic iron oxide nanopowder and process for producing the same

There is provided an iron oxide magnetic nanoparticle powder having a ferromagnetic property even if the particles have an average particle size of 15 nm or less, preferably 10 nm or less, and a method of producing the same, an iron oxide magnetic nanoparticle thin film containing the iron oxide magnetic nanoparticle powder and a method of producing the same, wherein the iron oxide magnetic nanoparticles having an &#x3b5;-FeOsingle phase, having the average particle size of 15 nm or less, and further 10 nm or less, are generated by using &#x3b2;-FeO(OH) (iron oxide hydroxide) nanoparticles as a starting material, and coating the (iron oxide hydroxide) nanoparticles with silicon oxide, and applying heat treatment thereto under an atmospheric air, and further the iron oxide magnetic nanoparticle thin film is obtained by using the iron oxide magnetic nanoparticles.

Iron oxide magnetic nanoparticle powder and method of producing the same, iron oxide magnetic nanoparticle thin film containing the iron oxide magnetic nanoparticle powder and method of producing the same

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Tokyo, Japan

Waka Tarora