Magnetism. Without it, we wouldn't be able to watch TV, listen to the radio, or talk on the phone. Without it, the recognition of magnetic phenomena has led to the invention of numerous electromagnetic instruments, such as the telephone, radio, generator, electric motor, and so on. Today, magnetic material vision, taste, smell and touch) directly experience the existence of magnetism, but people in practice or gradually unveiled its mystery. A magnet always has two n-poles and an s-pole. A magnet, if you cut it in the middle, becomes two magnets, each with its own pole. However small the magnet is divided, it will always have N and S poles, that is, the N and S poles will always be N or only S poles.

The N and S poles attract each other when they get close, and the N and N poles repel each other when they get close. Knowing this, we can see why a compass automatically indicates direction.

Pole N is near the geographic South Pole, and pole S is near the geographic North Pole. The N poles will attract each other, and the S pole of the magnet and the N pole of the earth will attract each other, so that the magnet will rotate until the poles of the magnet and S pole point to the S and N poles of the earth, respectively. At this time, the direction indicated by the N pole of the magnet is the geographical North Pole, generally divided into hard < permanent > magnet (magnetic stay longer or permanent time) and soft magnet (in a short time class, we said the magnet, generally refers to the permanent magnet. The permanent magnet is divided into two categories: NdFeB Magnet (Nd2Fe14B), ALNiCO (ALNiCO), SmCo (SmCo), including: 1, ndfeb magnet: it is currently found to have the highest commercial performance of the magnet, known as the magneto, the maximum magnetic energy product (BHmax) is more than 10 times higher than Ferrite. Its own machinery plus 200 degrees Celsius. Moreover, it is hard, stable and has good properties (such as Zn plating,Ni, passivation, etc.). Aluminum-nickel-cobalt magnet: an alloy of aluminum, nickel, cobalt, iron, and other trace metals.

Aluminum-nickel-cobalt permanent magnet has a minimum temperature inversion above 600 degrees Celsius. Aluminum-nickel-cobalt permanent magnet products are widely used in various instruments and other instruments. 3. Samarium cobalt (SmCo) can be divided into SmCo5 and Sm2Co17 according to different components. Because of its expensive material, samarium cobalt (SmCo), as a rare earth permanent magnet, not only has a high magnetic energy product (14-28 mgoe), high temperature environment.

Ferrite (Ferrite), its main raw materials include BaFe12O19 and SrFe12O19. Through ceramic brittle materials, ferrite magnets have good temperature resistance, low cost, Permanent magnets.

In electromagnetics, an electric current occurs in a closed circuit when two magnets or magnets attract or repel each other, or when a current-carrying wire creates a magnetic field around it, which causes the magnetism, or when a closed circuit moves over an inhomogeneous magnetic field. Every substance is more or less affected by magnetic fields. Ferromagnetism is the strongest and most ferromagnetic. A magnet or magnet produces a magnetic field. In addition, the paramagnetic material will tend to diamagnetic material will tend to move towards the area of weak magnetic field, spin glass properties, antiferromagnetism, such as temperature, pressure, external magnetic field, etc., depending on the temperature or other parameters, the material will show different magnetic.

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