Patent ID: 6589367
Filing Date: 2003-07-08
Classification: B82Y,H01F,Y10S

Abstract:
A magnetically anisotropic (rare earth)/(iron,cobalt)/boron-based nanocomposite permanent magnet material, in which the rare earth element is selected from the group consisting of praseodymium, neodymium, terbium and dysprosium, having a metallographic structure comprising a magnetically hard phase of which the crystalline grains are aligned in a direction relative to the easy magnetization axis, a magnetically soft phase consisting of crystalline grains and a non-magnetic phase having a melting point lower than the melting points of the magnetically hard and soft phases, in which the crystalline grains of each of the magnetically hard and soft phases have an average grain diameter in the range from 20 to 200 nm and are dispersed in the non-magnetic phase, and wherein the non-magnetic phase is selected from the group consisting of RCu2, in which R is a rare earth element selected from the group consisting of praseodymium, neodymiun, terbium and dysprosium, La, LaCu2, Laâ€”Cu alloys of which the content of La is at least 25 atomic %, Laâ€”Co and alloys of which the content of La is at least 55 atomic %.