Patent ID: 8303732

Claim:
A rare earth magnet having a composition represented by RTB wherein R denotes a rare earth element, T a transition metal and B boron, the magnet being composed of particles of magnetic powder constituted by crystalline particles, wherein the particles of the magnetic powder have a flat form in which a ratio of a short diameter to a long diameter is 0.5 or less, wherein an element Rm having a magnetic anisotropy higher than that of the rare earth element is contained in the surface and inside of the magnet constituted by the magnet powder, a concentration of Rm in the surface of the crystalline particles being higher than that of the inside thereof, wherein a size of the crystalline particles in c-axis is 20 to 100 nm, and a size in a direction perpendicular to the c-axis is 100 to 400 nm, and wherein an oxy-fluoride and carbon are present at least at crystal grain boundaries of the particles of the magnet powder.