How to Judge the Quality of Sintered NdFeB Magnets?

How to Judge the Quality of Sintered NdFeB Magnets? Sintered NdFeB permanent magnets, as one of the important substances to promote contemporary technology and social progress, are widely used in the following fields: computer hard disk, magnetic resonance imaging, electric vehicles, wind power, industrial permanent magnet motors, consumer electronics (CD, DVD, mobile phones, stereos, copiers, [...]