weiss theory of ferromagnetism
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Weiss theory of ferromagnetism. To explain the phenomenon of ferromagnetism, Weiss proposed a hypothetical concept of ferromagnetic domains. He postulated that the neighboring atoms of the ferromagnetic materials, due to certain mutual exchange interactions, from several number of very small regions, called domains.
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This theory explains the phenomenon of ferromagnetism.
Explanation:
- This theory was proposed by Weiss, in the year of 1907.
- According to this theory, the magnetic substance is made up of a large number of small domains.
- He defines that the adjacent atoms of the ferromagnetic materials, can able to exchange interactions,
- Each domain is a combination of atoms that have the same parallel spins.
- The resultant magnetic field is a vector sum of magnetization of all domains.
- In the absence of an external magnetic field, the atoms align themselves parallel to each other in the domain.
- This internal molecular field is directly proportional to the spontaneous magnetization of the material.
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