纳米稀土永磁材料的磁粘滞性

As nanocrystalline permanent magnets are quite different from traditional permanent magnets, the effect of intergrain exchange coupling on magnetic viscosity has been investigated in nanocrystalline rare-earth permanent magnets. Furthermore, the relationship between magnetic reversal mechanism and magnetic viscosity has been studied. It is found that the intergrain exchange coupling cannot be neglect as investigating thermal activation. The relationship between thermal activation and magnetic reversal mechanism has been obtained. For several typical nanocrystalline rare-earth permanent magnets, the mechanisms of coercivity are clear.

研究纳米稀土永磁材料中晶间交换耦合作用对磁粘滞性的影响以及纳米尺度下材料的硬磁行为与磁粘滞性的内在关系，探讨其反常磁粘滞现象发生的规律，弄清纳米稀土永磁材料中不同于普通永磁体的物理本质，为研制高性能纳米永磁材料提供理论依据和技术指导。本项研究内容属当今凝聚态物理的前沿课题，具有非常重要的学术意义和实用价值。