THIN STRIP MAGNET MATERIAL, MAGNETIC POWDER AND RARE EARTH BOND MAGNET

The ribbon shaped magnet material (quenched ribbon) (8) according to the present invention is obtained by ejecting a molten liquid (6) of an alloy containing at least one rare earth element and at least one transition metal from a nozzle (3), and quenching the molten liquid by allowing it to collide with the circumferential face (53) of a cooling roll (5). The microstructure of the quenched ribbon comprises soft magnetic phases and hard magnetic phases in adjoining relation to one another. Crystal grain sizes of the quenched ribbon (8) preferably satisfy the following equations Ä1Ü and Ä2Ü, and preferably satisfy at least one of the following equations Ä3Ü and Ä4Ü : D1s/D1h ≤ 0.9 D2s/D2h ≤ 0.8 0.5 ≤ D1h/D2h ≤ 1 0.5 ≤ D1s/D2s ≤ 1 wherein D1h and D1s denote the mean crystal grain size of the hard magnetic phase and soft magnetic phase, respectively, in the vicinity of the roll contact surface (81), and D2h and D2s denote the mean crystal grain size of the hard magnetic phase and soft magnetic phase, respectively, in the vicinity of the free surface (82).