The relative size of domains in nanocomposite NdFeB can reflect the intensity of exchange coupling. The exchange coupling effect increases with the increased relative size. The maximum exchange coupling effect is found when the Nd content is about 10%.

• 磁畴相对尺寸可以反映交换耦合的强度 ,晶粒间的交换耦合作用越强 ,磁畴相对尺寸越大 ,当Nd含量约为 10%25左右时交换耦合作用最强