The rare earth alloy and its manufacturing method and a manufacturing method of a sintered rare eart

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PROBLEM TO BE SOLVED : To provide a rare earth alloy to which uniform treatment is possible in a short time in heat treatment for a thin strip ingot and its manufacturing method, and to provide a method for manufacturing a rare earth sintered magnet having excellent magnetic properties. SOLUTION : An alloy essentially consisting of, by weight, 20 to 30% R (wherein, R is Sm or two or more kinds of rare earth elements including Sm by >=50%), 10 to 45% Fe, 1 to 10% Cu and 0.5 to 5% Zr, and the balance Co is melted and is thereafter rapidly cooled by a strip casting method to obtain the rare earth alloy. The alloy contains isometric crystals with a grain size of 1 to 200 μm by >=20 vol.% and has a sheet thickness of 0.05 to 3 mm. In this way, excellent magnetic properties can be obtained.