Magnet principles of knowledge
Magnet means generating a magnetic field may be an object or material , usually made of metal alloys having ferromagnetic . Can be grouped into " permanent magnet" and " non-permanent magnet" traditionally . 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 ) . Non-permanent magnets, and sometimes lose their magnetism .
The ancient Greeks and Chinese people find a kind of natural magnetic nature stone , called " magnet ." This stone can magically pick up small pieces of iron , but also in the free swinging always point in the same direction . Early sailors put this magnet as its earliest compass to discern the direction of the sea . After thousands of years of development, today we live in has become a magnet strong material. By synthesizing the alloy can be achieved with different materials, the same effects as a magnet , but also can improve the magnetic force. In the 18th century there have been man-made magnets, but the process of creating a stronger magnetic material was very slow until the 1920s to produce aluminum -nickel-cobalt (Alnico). Subsequently , the 1950s produced the ferrite (Ferrite), 70 years to create a rare earth magnet [Rare Earth magnet including NdFeB (NdFeB) and samarium cobalt (SmCo)]. Thus , magnetic technology has been rapid development , magnetic materials also makes the device more compact .
Most of the magnetic material can be magnetized to saturation in the same direction , this direction is called " magnetization direction" ( direction of orientation ) . No magnet magnetic orientation direction ( also called an isotropic magnet ) orientation ratio of the magnet ( also called anisotropic magnet ) is much weaker .
What is the standard " polar " industry defined ?
Definition of " arctic " is free to rotate it in the magnet 's north pole points to the Earth's North Pole. Similarly, the magnets are pointing to the Earth's South Pole South Pole .
In the absence of marked how to identify magnet Arctic ? Obviously just by eye is unable to distinguish . You can use the compass close to a magnet , pointing the pointer will point to the Earth's magnetic North Pole South Pole .
How safe handling and storage of magnets ?
We should always be very careful , because the magnet adsorbed together on their own , could pinch your fingers . There also may be due to collision damage magnet itself ( or knocked knocked corner cracks ) when magnets with each other. Easily magnetized magnet away from items such as floppy disks , credit cards , computer monitors , watches , cell phones , medical equipment and so on. Magnet away from the pacemaker .
Larger size magnet , should be added between each piece of plastic or cardboard shims to ensure that the magnet can easily be separated . Magnets should be stored in a dry , heated environment. How do magnetic isolation ?
Only can be adsorbed into the material in order to cut off the magnet on the field of play a role , but the thicker the material , the better the effect of magnetic isolation .
What is the strongest magnet ?
The highest performance magnets are rare earth magnets , rare earth magnets and Nd-Fe is the most powerful magnet. However, in the above 200 ° C environment , is the most powerful samarium cobalt magnet . Magnet , the magnet should be called , in English Magnet, magnet now mainly divided into two categories, one is soft , one is hard magnetic ; soft includes silicon steel and soft iron core ; hard magnetic include alnico , SmCo , ferrite and NdFeB , which, samarium cobalt magnet is the most expensive , the most expensive is the ferrite magnets , NdFeB magnets are the highest performance , but the performance of the most stable , best temperature coefficient Alnico magnet is , the user can select a different hard magnetic products according to different needs.
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