Talk:Antiferromagnetism

message: antiferromagnetic metals are used in the watch industry to make the mechanical watches resistent to the magnetic field in the surroundings...
Magnetic electrons ?! I'm changing ot back to electrons. Vorpal Bladesnicker-snack 10:30, 1 August 2006 (UTC)
thread_title:  Minor edits 

message: A large part of the article is spent discussing geometric frustration, which already has a rather complete article of its own.  I'll do my best to clean it up, but perhaps more bold measures are needed. JaredAllred (talk) 20:31, 4 March 2010 (UTC)
thread_title:  Redundancy 

message: This article does little or nothing to either define antiferromagnetism or distinguish it from paramagnetism, ferrimagnetism and dimagnetism.  The introduction immediately jumps into the mechanism of the effect without ever defining it or even explaining the behavior in a cogent way.  The mechanism of the effect should be delayed until after the introduction, rather than be the introduction. --ssd (talk) 02:28, 1 October 2011 (UTC)
replies: text: I agree. The Britannica article on this topic is much more understandable to the layperson. 69.22.242.15 (talk) 13:33, 23 December 2016 (UTC)

text: This isn't the first or the last article in our beloved Wikipedia (completely honest remark) that doesn't make it too easy for the layperson. From what I figured, antiferomagnetic materials don't do essentially anything in the antiferomagnetic phase -they neither attract or push other magnetic material, below a certain temperature, and then they act simply as paramagnetic.2A02:587:4508:2C00:688F:C34C:D0FC:9449 (talk) 03:35, 26 July 2017 (UTC)
thread_title:  unclear 

message: Substituted at 08:00, 29 April 2016 (UTC)
thread_title: Assessment comment

message: Can you further define 'ground state' please? It sounds like any state here not all of the spins are aligned.
162.207.203.26 (talk) 16:44, 26 September 2020 (UTC)
thread_title:  Geometric Frustration 

message: Don't confuse knowing all about something with the ability to explain it to somebody, those are two entirely different things. The author needs to back up a bit and remember what it was like being 16 years old, and then RE-explain things again.
I'm a chemist, and to become a chemist, I had to have physics, too. If I can't understand what is presented in this article, then a high school student can't, either.
C'mon! Wikipedia is not for those who already have a working knowledge of the subject!
Linstrum (talk) 03:27, 9 July 2021 (UTC)
thread_title:  This is another "written for those already in the know" articles. 

message: To MadeOfAtoms
The image is not helpful because it is false. In an antiferromagnetic material, spins are aligned in opposite directions only for transverse neighbors, not for longitudinal ones. Learn the basics. See for example the little film : Magnetic orders : comparison between ferro, antiferro and ferrimagnetism, on the same page. TD (talk) 10:46, 29 July 2023 (UTC)
replies: text: There are multiple ways to order antiferromagnetically. The figure does show antiferromagnetic ordering with wavevector Q=(pi/a,pi/a). This is the natural ordering in the case where the interaction energy between neighbouring spins is minimized when the spins are antiparallel and there are no other energies to consider. The transverse ordering Q=(pi/a,0) would have higher energy, since the interaction energy is maximal in the y-direction. Jähmefyysikko (talk) 11:23, 29 July 2023 (UTC)
replies: text: Can you give me an example of magnetic material with the order described on this image ? TD (talk) 11:28, 29 July 2023 (UTC)

text: I suppose this is my mistake. There are others kinds of antiferromagnetic ordering than the one I knew. But in 2D, this image is very counterintuitive, and not typical of antiferromagnetic materials, isn't it ? In 3D, it is more subtle.TD (talk) 11:43, 29 July 2023 (UTC)
replies: text: It occurs in cuprates at least, and is also the ground state of antiferromagnetic square lattice Ising model. What makes it counterintuitive? Each pair of nearest neighbours is in antiparallel configuration. Jähmefyysikko (talk) 12:09, 29 July 2023 (UTC)
replies: text: Thanks for your answer. The figure is counterintuitive because a north magnetic pole repels a north magnetic pole. From a pedagogical point of view, this order seemed wrong, but I'm not an expert in the field. When I play with toy magnets, the other antiferromagnetic order appears naturally. TD (talk) 12:19, 29 July 2023 (UTC)
replies: text: It is a good point. I'd say your intuition fails because here the interaction between the spins is dominated by quantum mechanical short-range interaction, not the electromagnetic interaction. In fact, in the simplest models the magnetic field is neglected completely. Jähmefyysikko (talk) 12:29, 29 July 2023 (UTC)
replies: text: Thanks for your kind and enlightening answer.  TD (talk) 12:39, 29 July 2023 (UTC)
thread_title:  False image