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Ferrite Magnets Magnetic Material
Nov 03, 2017

Ferrite Magnets Magnetic material

Ancient Greeks and Chinese people found in nature a kind of natural magnetite stone, called "iron". This stone can be a magic suck up a small piece of iron, and after the random swing is always pointing to the same direction. The early sailors used this magnet as its earliest compass to identify the direction of the sea. After thousands of years of development, today the magnet has become a strong material in our lives. By combining the different materials of the alloy can achieve the same effect with the magnets, but also can improve the magnetic force. In the 18th century there were man-made magnets, but the process of making stronger magnetic materials was slow until Alnico was made in the 1920s. Ferrite was subsequently made in the 1950s, and rare earth magnets were made in the 1970s [Rare Earth magnets including NdFeB and SmCo]. At this point, the magnetic technology has been rapid development, strong magnetic materials also makes the components more compact.

 What is magnetization (orientation) direction?

Most magnetic materials can be magnetized in the same direction to saturation, a direction called "magnetization direction" (orientation). Magnets without orientation (also called isotropic magnets) are much weaker than magnets with oriented magnets (also called anisotropic magnets).

What is the standard "North Pole" industrial definition?

The "North Pole" is defined as the magnet's north pole pointing to the North Pole of Earth after its random rotation. Similarly, the south pole of the magnet is also pointing to the south pole of the earth. How to identify the magnet's north pole without marking?

 Obviously the eyes alone can not tell. You can use a compass close to the magnet, the pointer pointing to the north pole of the earth points to the south pole of the magnet.

How to handle and store magnet safely?

Always be careful because the magnets stick together and can get your fingers caught. When the magnets are adsorbed to each other, the magnets themselves may be damaged due to collisions (knocking corners or cracking a crack). Keep the magnet away from objects susceptible to magnetization, such as floppy disks, credit cards, computer monitors, watches, cell phones, medical devices and more. Keep the magnet away from pacemakers.

 Larger size magnets should have plastic or cardboard spacers between each piece to ensure that the magnets can be easily separated. Magnets should be stored in a dry, constant temperature environment. Magnet is not human invention, there are natural magnetite, the earliest discovery and use of the magnet should be Chinese. So "compass" is one of the four Chinese inventions. As for the composition that is iron, cobalt, nickel, etc. Its atomic structure is special, the atom itself has a magnetic moment .Generally these mineral molecules arranged disorderly.Magnetic zone mutual influence is not magnetic ... However, under the external force (such as magnetic field) The same direction of molecular alignment tend to show the magnet, which is commonly known as the magnet iron cobalt nickel is the most commonly used magnetic material basically divided into permanent magnet and soft iron permanent magnet is coupled with strong magnetic magnetic spin and electronic Angular momentum into a fixed direction of arrangement of soft magnetic is coupled with the current (also a method of adding magnetic) and other current removal of soft iron will gradually lose magnetism As for the earliest magnet who found the oldest record is the Chinese Huang Di Wars Chiyu guide car So called one of China's four inventions! China in the first century BC that is aware of the case of magnet polarization.

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