Patent ID: 7371292

Claim:
A Nd—Fe—B type rare earth magnet alloy for a Nd—Fe—B type anisotropic exchange spring magnet comprising: hard magnetic phases and soft magnetic phases; wherein a minimum width of the soft magnetic phases is smaller than or equal to 1 μm; a minimum distance between the soft magnetic phases is greater than or equal to 0.1 μm; and a composition of the Nd—Fe—B type rare earth magnet alloy is expressed by the following chemical formula (1) Nd x Fe 100-x-y-z B y V z (1) where x is within a range from 9 to 11, y is within a range from 5 to 8 and z is within a range from 0 to 2, wherein chemical formula (1) optionally comprises Co, and if Co is present in the alloy 0.01 to 30 atom % of Fe is replaced with Co.