2024年9月12日 · Magnets that can maintain their magnetism for a long time are called permanent magnets, such as natural magnets (magnetite) and artificial magnets, etc. Permanent magnets are not easily demagnetized or magnetized and the polarity of them will not change.

2024年1月15日 · Permanent Magnets are materials that can create a magnetic field even if the magnetization force is removed. Unlike other magnets, it keeps its magnetic power all the time. They are made of hard ferromagnetic materials, for example, Ferrite and Alnico.

Modern theories of magnetism maintain that a magnetic field is produced by an electric charge in motion, and thus it is theorized that the magnetic field of a so-called “permanent” magnets such as lodestone is the result of electrons within the atoms of iron spinning uniformly in …

2024年9月26日 · Permanent magnets are strong magnets or powerful magnets that maintain their magnetic properties for a long time. You can also refer to permanent magnets as materials that retain their magnetism long after being exposed to a magnetic field.

2024年9月12日 · Permanent magnets are commonly used in industries such as electronics, automotive, energy, aerospace, medical devices, and manufacturing. They play key roles in electric motors, generators, sensors, magnetic separators, …

2025年1月22日 · A permanent magnet is a magnet whose internal construction creates a lasting magnetic field inside of it. Know its examples, properties, types and applications. English

In rare-earth element: Permanent magnets. The most prominent rare-earth intermetallic compound is Nd 2 Fe 14 B, which is ferromagnetic and, with proper heat treatment, becomes the hardest magnetic material known. Hence, this intermetallic compound is used as a permanent magnet in many applications. Its main uses are in electric motors (e.g ...