Iron-based rare earth alloy magnets and its manufacturing method

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PROBLEM TO BE SOLVED : To provide a permanent magnet with high coercivity and excellent rectangularity in demagnetization curve although containing less rare earth. SOLUTION : The magnet has a composition which is described by a formula (Fe1-mTm)100-x-y-zQxRyTiz(wherein T denotes one or more elements selected from the group consisting of Co and Ni, Q denotes one or more elements selected from the group consisting of B and C, and R denotes one or more rare earth metals not substantially including La or Ce) and contains R2T14Q type compound crystal grains and a ferromagnetic iron based boride. The ferromagnetic iron based boride forms a film along the boundaries in between R2T14Q type compound crystal grains, and covers the grain surfaces. COPYRIGHT : (C)2003, JPO