Method and systems for uniform distribution of additive domains in the grain boundary of magnets

A method of incorporating additive domains in a rare earth magnet, comprising:

• introducing inert gas into a chamber of a jet mill and forming an inert gas stream;
• introducing a plurality of coarse neodymium-iron-boron (NdFeB) particles into the chamber;
• agitating the plurality of coarse NdFeB particles with the inert gas stream;
• impacting the plurality of coarse NdFeB particles with each other producing a plurality of refined NdFeB particles;
• impacting the plurality of refined NdFeB particles against a target including a target material;
• transferring a portion of the target material onto a surface of the refined NdFeB particles, wherein the target is at least partially formed of at least one of a metal, a metal alloy, an intermetallic compound, and a ceramic;
• separating the plurality of refined NdFeB particles including the target material from the plurality of coarse NdFeB particles;
• separating the plurality of refined NdFeB particles including the target material from the inert gas stream;
• and
• collecting the plurality of refined NdFeB particles including the target material, wherein the plurality of refined NdFeB particles including the target material form a plurality of grains in a magnet and the target material forms an additive domain in the magnet.