Talk:Magnetic domain

message: On 14 May 2011 a new article was created, titled Domain theory of ferromagnetism.  It was created by a new User who has only made one edit - the new article.  It is presently unreferenced and may not even be technically sound.  It needs the scrutiny and assistance of some Users who are knowledgeable in the field of magnetic domains.  Perhaps it should be merged with Magnetic domain.  Please visit Domain theory of ferromagnetism.  Dolphin (t) 05:48, 13 June 2011 (UTC)
replies: text: I agree.  These articles need better organization.  I found a reference for the article Domain theory of ferromagnetism, and used the reference to create a new lead, explain energy minimization, and a few other things.  It still needs a lot of work, and I seem to be duplicating much of what is already in ferromagnetism and Magnetic domain.  I would like some suggestions about where to go.  Wikfr (talk) 22:29, 19 September 2011 (UTC)
replies: text: I agree Domain theory of ferromagnetism needs to be merged.  But I'm not sure where it should be merged so I think this discussion should be moved to its Talk page.  I put a merger tag on the page.  --ChetvornoTALK 13:13, 29 February 2012 (UTC)
replies: text: Merged Domain theory of ferromagnetism into this article. --ChetvornoTALK 15:10, 23 March 2012 (UTC)
thread_title:  Merge [[Domain theory of ferromagnetism]] here? 

message: This article and Weiss domain refer to the same thing  — Preceding unsigned comment added by 145.107.9.6 (talk) 13:07, 28 July 2011 (UTC)
replies: text: I agree. I have added a merge template. There is discussion in talk:Weiss domain about Weiss domains being the appropriate term for ferroelectricity, but a quick web search suggests that most people call them Ferroelectric domains. Besides, there is minimal discussion of ferroelectricity on the page Weiss domain. RockMagnetist (talk) 19:15, 28 September 2011 (UTC)
replies: text: I agree to the merge.  --ChetvornoTALK 13:14, 29 February 2012 (UTC)
thread_title:  Merge [[Weiss domain]] into this article? 

message: The new section "Different types of magnetism" has no reference to magnetic domains.  I feel it is not relevant to the subject of the article. --ChetvornoTALK 14:54, 18 February 2014 (UTC)
thread_title:  "Different types of magnetism" not relevant 

message: I have a very important question of the experts that created the magnetic domains article. Please forgive me if I am not using the right protocols. 
It seems to me that the most important question to answer (in the subject of domains) is how is it that permeability can increase the magnetic field of a coil by a factor of a thousand in some cases. Surely a student would find this like getting something for nothing; a whole-lot of something for very little, anyway.
Perhaps the question can be asked another way. Magnetic domains create local fields that are huge compared to any external field, and getting them to line up, clearly would create a very large field. The mechanism for doing this appears to be something akin to amplification. But how can that happen? How is it that a weak external field somehow passes through the domain boundaries (to get the domains to line up) whereas the much more intense field of the domains themselves are unable to influence each other through domain boundaries?
Here's another question from a perspective of a child:
Magnets increase their field strength when they stack on top of each other. They can also increase their field when pushed together side to side. But in one case they want to stack and in the other case they have to be pushed together with a great deal of force. What is the mechanism for that pushing within the domain? Clearly the domains have a width as well as a length, so the atoms must somehow be forced toward each other the hard way.
Walter clark (talk) 00:08, 24 June 2014 (UTC)
replies: text: I agree, those are important questions.  The answer is kind of complicated from the point of view of domains.  I was thinking of adding another section to this article, about ferromagnetic materials in an external magnetic field, showing how an external field makes the domain walls shift so the dipoles line up parallel, explaining how the hysteresis curve comes about.  Maybe that will help. --ChetvornoTALK 06:47, 24 June 2014 (UTC)

text: If I understand your question, the answer is that as you pointed out, even in an unmagnetized piece of ferromagnetic material, because the atomic dipoles are lined up parallel, there is a "huge" local field; the magnetic field is already there.   But because the bulk material is divided into domains in which the dipoles point in different directions, the magnetic field is divided into small fields contained inside the material; the magnetic field lines just link the N and S poles of the domains.   An external magnetic field, created by a coil of wire, just turns the direction of the domains so their little magnetic fields are parallel, causing their little magnetic fields to extend outside the piece of material in one big magnetic field.  It takes less energy to turn the direction of magnetization than it would to create the magnetic field from scratch.  That is the reason for the "amplification" you mention, why the permeability of an iron core can multiply the field of a coil a thousand times. --ChetvornoTALK 06:47, 24 June 2014 (UTC)
thread_title: Important questions the article needs to answer

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thread_title:  External links modified