Ferromagnetism | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Ferromagnetism


00:01:35 1 History and distinction from ferrimagnetism
00:02:32 2 Ferromagnetic materials
00:04:05 2.1 Actinide ferromagnets
00:04:31 2.2 Lithium gas
00:05:35 2.3 Tetragonal ruthenium
00:05:47 3 Explanation
00:05:56 3.1 Origin of magnetism
00:06:22 3.2 Exchange interaction
00:06:32 3.3 Magnetic anisotropy
00:06:45 3.4 Magnetic domains
00:06:54 3.5 Magnetized materials
00:07:18 3.6 Curie temperature
00:09:15 4 See also
00:11:53 5 References
00:12:54 6 External links
00:14:30 undefined
00:17:18 undefined
00:18:36 undefined



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SUMMARY
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Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. In physics, several different types of magnetism are distinguished. Ferromagnetism (along with the similar effect ferrimagnetism)  is the strongest type and is responsible for the common phenomena of magnetism in magnets encountered in everyday life. Substances respond weakly to magnetic fields with three other types of magnetism, paramagnetism, diamagnetism, and antiferromagnetism, but the forces are usually so weak that they can only be detected by sensitive instruments in a laboratory.  An everyday example of ferromagnetism is a refrigerator magnet used to hold notes on a refrigerator door.  The attraction between a magnet and ferromagnetic material is "the quality of magnetism first apparent to the ancient world, and to us today".Permanent magnets (materials that can be magnetized by an external magnetic field and remain magnetized after the external field is removed) are either ferromagnetic or ferrimagnetic, as are the materials that are noticeably attracted to them.  Only a few substances are ferromagnetic.  The common ones are iron, nickel, cobalt and most of their alloys, and some compounds of rare earth metals.
Ferromagnetism is very important in industry and modern technology, and is the basis for many electrical and electromechanical devices such as electromagnets, electric motors, generators, transformers, and magnetic storage such as tape recorders, and hard disks, and nondestructive testing of ferrous materials.