Magnets can be grouped into "permanent magnet" and "non-permanent magnets." The permanent magnet may be a natural product, also known as natural magnet to be manufactured by a human (the strongest magnets are neodymium magnets). The non-permanent magnet, and only under certain conditions have a strong magnet magnetic sucker, usually in the form of an electromagnet to produce, that is, using a current to strengthen the magnetic field. Definition magnet, the magnet should be called, in English: Magnet, Magnet mainly divided into two categories, one is soft, one is hard-magnetic. The concept includes soft silicon and soft core; hard magnetic include alnico, SmCo, ferrite and NdFeB, of which, the most expensive is samarium cobalt magnets, ferrite magnets cheapest The highest performance NdFeB magnets, but the performance of the most stable, best temperature coefficient is Alnico, the user can select a different hard magnetic products according to different needs. We are talking about powerful magnets round magnets, the magnets are generally refers to the permanent magnet. Permanent magnet is divided into two large magnets classification. Other ancient literature such as "Shan Hai Jing" also has a similar record. Magnetic properties of iron absorption was found very early, "Lu" chapter nine volumes have proficient: "chee recruit strong magnet iron buckle, or lead it also." At the time called the "magnetic" to "chee" They The magnet attracts iron seen as a loving mother to attract children. And said: "The stone is a hard mother, but 石有慈 two and has not been kind, loving stone to attract his children, has not been kind of stone can not be attracted." Chinese people before the magnet is written 'chee stone ", is the meaning of love stone. North also three hundred and twenty years, Hill said irrigation problems of its multi ailanthus Zhe, under which more than quicksand, multi-Tobe. There are animal behavior, its like a cow and a white tail, it sounds like Jiao, the name that the Father. Bird behavior, its like pheasant and female faces of the people, to see people you jump, the name startled Sri Lanka, since the Ming call also. Carpenter Han water out of Yan, while the West streamer in Ao Chak, where more magnet. Notes ③ magnet: Also as "chee Stone", a natural mineral, has attracted iron, nickel, cobalt and other metal material properties. Commonly known as a magnet, now known as magnetite. Compass, one of the four ancient Chinese invention, the system is the use of magnets made. Powerful magnet block | Guangdong powerful magnets | New Tong Xin magnetic provided by the Dongguan City Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) strong, credible, in Dongguan, Guangdong magnetic materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new Tong Xin magnetic and you hand into the brilliant, for a better future!