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What are the soft magnet and the hard magnet?
Soft magnetic includes silicon steel sheet and soft magnet core. Hard magnet includes aluminum nickel and cobalt, SmCo, ferrite, neodymium iron boron. Among these, the most expensive is samarium cobalt magnets, the cheapest is ferrite magnets and the highest performance is NdFeB magnets. But the alnico has the most stable performance and the best temperature coefficient.
The user can select different magnetic products according to different needs. The magnet we said, generally, refers to the permanent magnet. A permanent magnet is divided into two categories.
Permanent magnet: permanent magnet:can be a natural product, also known as lodestone, and can also be made by hand. The strongest magnet is NdFeB magnet.
Non-permanent magnet: non-permanent magnet, heated to a certain temperature, will suddenly lose their magnetism, which is due to the arrangement of the composition of the magnet many "magnet" from order to disorder. Putting magnets that losses their magnetism into a magnetic field, when the magnetization reaches a certain value, it is magnetized, then the arrangement of "magnet" is from disorder to order again.
from：http://www.htmagnets.com/newsd-nid-8.html
