Magnet - Wikipedia
网页A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door.
What Is a Permanent Magnet? - Stanford Magnets
网页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 …
永磁铁 - 百度百科
网页永磁铁(permanent magnet)，即永久性磁铁，可以是天然产物，又称天然磁石，也可以由人工制造（最强的磁铁是钕铁硼磁铁).具有宽磁滞回线、高矫顽力、高剩磁，一经磁化即能保持恒定磁性的材料。
Permanent Magnet Definition - MagLab - National MagLab
网页2022年11月28日 · Permanent magnets are materials where the magnetic field is generated by the internal structure of the material itself. Inside atoms and crystals you have both electrons and the nucleus of the atom.
Permanent magnet | physics | Britannica
网页A good permanent magnet must have a large spontaneous magnetization in zero field (i.e., a high retentivity) and a high coercive force to prevent its being easily demagnetized by an external field. Both of these imply a “fat,” almost rectangular hysteresis loop, typical of …
Permanent Magnet - an overview | ScienceDirect Topics
网页Permanent magnets are materials that retain their magnetic properties after having been exposed to a magnetic field. They are found in a great variety of materials used in a significant and increasing number of industrial and commercial applications.
Permanent Magnets - HyperPhysics
网页The permanent magnets which have produced the largest magnetic flux with the smallest mass are the rare earth magnets based on samarium and neodymium. Their high magnetic fields and light weight make them useful for demonstrating magnetic levitation over superconducting materials.
Permanent Magnet Materials and Applications | SpringerLink
网页2021年11月28日 · A permanent magnet (PM) is able to carry a macroscopic magnetization whose magnitude and direction are persistent and resist applied magnetic fields opposite or transverse to the magnetization. This is understood in terms of the relativistic quantum physics, solid-state physics, and physics of thermodynamically metastable states.
Inventing the world’s strongest magnet - Nature
网页Before the discovery of the neodymium magnet, the strongest permanent magnet was the samarium–cobalt magnet, which was based on the Sm 2 Co 17 intermetallic phase. However, samarium is...
Introductory Chapter: Modern Permanent Magnets - IntechOpen
网页2024年4月3日 · Permanent magnets are highly magnetized functional hard materials, which do not lose magnetism over time due to the generation of magnetic field by the internal structure of the material itself [1, 2, 3]. These modern permanent magnets are made from a “cocktail” of minerals which can include iron, neodymium, samarium, cobalt and nickle.