| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high-performance ferrite magnet having a high Br and high remanence ratio Hk/iHc by preparing a microstructure where La and/or Co is unevenly distributed. <P>SOLUTION: The ferrite magnet which has a major component composition expressed by (A<SB>1-x</SB>R<SB>x</SB>)O-[(Fe<SB>1-y</SB>M<SB>y</SB>)<SB>2</SB>O<SB>3</SB>] (atomic ratio) (wherein A is Sr and/or Ba, R is at least one kind of rare earth elements containing Y and definitely contains La, M is Co or Co and Zn, and x, y, and n are numerals that each meet the following conditions: 5.0≤n≤6.4, 0.01≤x≤0.4, and 0.005≤y≤0.04), and substantially has a magneto-plumbite type crystal structure, and a low-concentration region of La or Co is present in a scope in which a circle of diameter of at least 0.2 μm can stay. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
