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)

Curie vs. Neel temperature?[edit]

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
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.
That may be your opinion, but Wikipedia only reports standard usage. —Steven G. Johnson
Should the second figure not be corrected then: (1) --> (2) is the Curie temperature; (2) --> (3) is the Néel temperature ? - N.

Ferro- Ferri- and All Kinds of Magnetism[edit]

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)

Diagram request[edit]

It would be useful to illustrate how the phenomenon arises and how it is different from ferromagnetism. -- Beland 04:07, 1 April 2007 (UTC)

Existing diagrams apper to fulfil request. Reqdiagram removed. Egmason (talk) 05:01, 29 August 2010 (UTC)

KInds of Magnetism in Tables[edit]

to "Beland": I wish I knew your e-mail, that way you can see my "all the kinds of magnetism in two tables". They are MS-Word tables -- but way too formatted to put into Wikipedia. The "e-mail" is for anybody who wants me to I will e-mail the two tables. One gives all the kinds of magnetism in the OBSERVABLE PHENOMENA each kind exhibits; the other table gives the (microscopic) mechanism for how those phenomena come to exist. e-mail Mark.Weiss@bep.treas.gov and I'll send you the tables. Last thing: while I have read Wikipidea I am not expert at modifying its content. All I know are these discussion pages. Mostly I want you to see my tables. How can I get them into Wikipedia -- even as pictures (I can make bitmaps out of my Word tables if absolutely necessary). The tables are way too formatted, scrunching fonting to fit, etc. for any "plain text" to work. Anyway, glad you liked (or seemed to like) the content. I didn't get any "it's crap" comments. My tables are a synthesis -- in an orderly way! -- of many many books on magnetism.

to anyone else: if you want two tables that neatly categorize all kinds of magnetism -- ferro- ferri- super-para- para- antiferro- and dia- magnetism, just ask me & I'll e-mail you the two MS-Word tables. e-mail: Mark.Weiss@bep.treas.gov —The preceding unsigned comment was added by 199.196.144.11 (talk) 14:47, 23 April 2007 (UTC).


wtf?[edit]

I wish this article was written so that a real human being could understand it. —Preceding unsigned comment added by 75.110.61.99 (talk) 01:28, 21 August 2008 (UTC)