Talk:Ferrimagnetism
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Does the author of this page really mean "ferromagnetism," not "ferrimagnetism?" 136.142.109.122 22:06, 19 Jul 2004 (UTC)
- No. ferromagnetism is a separate property - Omegatron 13:40, Apr 6, 2005 (UTC)
What is the origin of the prefixes ferro- and ferri-? - Omegatron 13:40, Apr 6, 2005 (UTC)
- From Latin ferrum which means iron; ferri- may have something to do with ferrite (though ferrite is ferromagnetic). Icek 21:42, 15 April 2006 (UTC)
[edit] Curie vs. Neel temperature?
Both of my solid-state texbooks (Kittel and Ashcroft/Mermin) call the critical temperature at which a ferrimagnet ceases to have a spontaneous magnetization the "Curie temperature", just as for ferromagnets. The term "Neel" temperature is reserved for antiferromagnets with zero magnetic moment in their ordered phase. —Steven G. Johnson 02:04, 16 December 2005 (UTC)
- Indeed, Neel is for antiferromagnetic materials, and Curie for ferro- and ferrimagnets. -A nanotechnology student
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- Considering ferrimagnets contain two sublattices of opposing magnetisation directions they bear more in similarity with a antiferromagnet as opposed to a ferromagnet and hence the describing it using a Neel temperature (which arises in the treatment of two sublattices) is more appropriate. - A Physics student.
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- That may be your opinion, but Wikipedia only reports standard usage. —Steven G. Johnson
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[edit] Ferro- Ferri- and All Kinds of Magnetism
Ferro -- pure parallel coupling of spins + coupling energy beyond critical value + particle not too small --> pure ferromagnet in which DOMAINS not spins independently respond to applied fields; spontaneous magnetization at zero applied field; hysteresis, coercive force exist
Super-Paramagnetic -- a would-be ferro, but coupling constant too small (or temperature too high) or particle too small (sub-domain)
Ferri -- two mechanisms, but the the most common are two lattices one with parallel coupling (ferro) and one with antiparallel coupling (antiferro); magnetite Fe3O4 is a case where Fe3+ ions are in octahedral and tetrahedral sites -- and they couple antiferromagnetically; but Fe2+ ions are in half the octahedral sites too and these Fe2+ couple ferromagnetically; Ferri is just usually weaker form of ferromagnet -- all the same phenomenology though
PLEASE E-MAIL ME and I can send you "all" of magnetism explained in two tables: (1) the observed phenomenology for each kind of magnetism and (2) the microscopic mechanism giving rise to each
My e-mail is this: Mark.Weiss@bep.treas.gov 199.196.144.11 21:32, 21 March 2007 (UTC)
- Feel free to contribute this information to the article magnet or magnetism; I'm not entirely sure whom you are addressing or why e-mail is necessary. -- Beland 04:11, 1 April 2007 (UTC)
[edit] Diagram request
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It would be useful to illustrate how the phenomenon arises and how it is different from ferromagnetism. -- Beland 04:07, 1 April 2007 (UTC)
