Light rare earth elements or other non - rare earth elements can be used to partially replace heavy rare earth elements. On the premise of ensuring magnetic properties, the dependence on heavy rare earths can be reduced or eliminated. For example, research has found that adding an appropriate amount of cerium can improve the coercivity and temperature resistance of neodymium - iron - boron magnets.

Meanwhile, the fine - grain technology helps to prepare magnets with fine and uniform grains and continuous grain boundaries, optimize the structure of rare - earth permanent - magnet materials, and improve their magnetic properties.