· · Boron magnet of rare earth iron and its manufacturing method

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PROBLEM TO BE SOLVED : To directly make a rare earth/boron/iron magnet anisotropic and in bulk in the presence of a liq. phase by the hot uniaxial deforming from its quenched thin tape. SOLUTION : A nanocomposite magnet is composed of R (one or more kinds of rare earth elements including Y), Fe (or Fe substituted by a specified quantity of Co), B and, if necessary, M (one or more kinds of Al, V, Mo, Zr, Ti, Sn, Cu, and Ga 4 atm.% or more), the Fe content is 82 atm.% or more, and the hard phase is of R2Fe14B and the soft phase is of Fe3B. A rare earth/iron/boron magnet is a nanocomposite magnet made anisotropic and in bulk which has a hard phase of R2Fe14B exchange-bonded with a soft phase having a higher saturation magnetization than the hard phase and is obtained by the direct hot uniaxial deforming, quick temp. rise and quenching process from a quenched thin tape having a compsn. wherein a liq. phase exists in the hot uniaxial deforming process.