Magnetic iron oxide particle, magnetic material, and radio wave absorber

US8444872B2 · kind B2 · utility

Assignees

• THE UNIVERSITY OF TOKYO · JP
• DOWA Electronics Materials Co., Ltd. · JP

Inventors

• Shin-ichi Ohkoshi · Tokyo, JP
• Shunsuke Sakurai · Yokohama, JP
• Takenori Yorinaga · Tokyo, JP
• Kazuyuki Matsumoto · Tokyo, JP
• Shinya Sasaki · Koganei, JP

Key dates

• Filing date: May 30, 2008
• Grant date: May 21, 2013
• Expiry date: Feb 22, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/5481
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed is a magnetic material having high Hc and High Curie point, which is capable of controlling such magnetic characteristics without requiring rare or expensive raw materials. Specifically disclosed is a magnetic material composed of particles of a magnetic iron oxide which is represented by the following general formula: ε-AxByFe2−x−yO3 or ε-AxByCzFe2−x−y−zO3 (wherein A, B and C each represents a metal excluding Fe and different from each other, satisfying 0<x, y, z<1), with ε-Fe2O3 as a main phase.