Talk:Neodymium magnet

message: Both KJ and Gaussboys give "grades" for their magnets (N38, N42, N45 etc.), but don't explain what exactly these mean, other than that higher grades mean stronger magnets. Can anyone shed light on that? Does it have to do with the purity of the material used to build the magnet?
I think this should definitely be covered in the article. -- Schnee (cheeks clone) 22:10, 22 Jun 2005 (UTC)
replies: text: Yeah, I agree.  How are Neodymium magnets made?!?  ^_^  Jumping cheese Contact 08:54, 29 October 2006 (UTC)
replies: text: would also like to know exactly how they're made. I've also read comments to the effect that they fade over time - is there any truth behind this? verifiable stuff only please (with citations). dreamcatcher23 (talk) 22:04, 6 April 2008 (UTC)
replies: text: They don't seem to fade much, they're very stable, provided they don't get too hot. If you want to see how they are made, check out Supermagnetman's explanation: - (User) Wolfkeeper (Talk) 03:26, 12 September 2008 (UTC)
thread_title: Article should explain "grades"

message: The article mentions
toys containing neodymium magnets the size and shape of aspirin tablets.
Can someone please replace this with a proper measurement? Even the original Bayer Aspirin is available in different shapes and sizes, let alone all the different stuff called "Aspirin" which is available in the USA. --BjKa 13:52, 8 November 2006 (UTC)
thread_title:  Aspirin? 

message: I was wondering if anyone had opinions on my adding a link to a site that sells a wide variety of Neodymium and Samarium Cobalt magnets. The only drawback is that in addition to selling magnets for normal uses he also sells "medical" versions for the so called magnet therapy.
Here's the link for those interested to review, I'm new to editing so opinions on the appropriateness of this link are welcome.
Engineered Concepts (Super Magnet Man)
Fatal shadow 00:46, 17 July 2007 (UTC)
thread_title:  External Links 

message: I'm 15 and I'm fascinated with the new development of 'free energy' I saw on YouTube by developers who are using magnetic fields to defy the laws of science and have created a perpetual motion machine== http://www.youtube.com/watch?v=BNDIWY19gqA&mode=related&search=  == I think their discovery will go down in history as the greatest of all time.  And I really admire that they are going to give the technology for free to 3rd world nations to level the playing field.  I'm guessing that the magnets they are using are one from the family of super magnets but does anyone know or have an idea which kind of magnet they might be using?Sasha2991 07:17, 10 August 2007 (UTC)
replies: text: Please my friend do not be fooled by things like these. I am 18. 'free energy' is impossible. It cannot be discovered because it breaks all rules of physics. You CANNOT defy physics. There are at times when you can exploit loopholes in the physics, but this is a rare case. Every single "free energy" device in history has been invented by people who do not know physics and have just discovered something that people already knew about and what they are really doing is using energy from someplace they do not understand. That video really makes sky news look quite bad and show how ignorant they are. If you look into it, you will find no where that they actually tell what they do. What they are really doing is lying through their teeth to get publicity for whatever other products they are selling. Whey they talk about nonsense like "religious" and other nonsense is because the rules of thermodynamics really are completely solid. People misunderstand electromagnetism a lot or try and make other people misunderstand it to make them think they are actually making energy.Ergzay (talk) 09:25, 25 February 2008 (UTC)
replies: text: I haven't looked too far into this particular case - but I'd be wary. Such "free energy" things usually fall into two categories - either they're wrong (the physics isn't understood and the energy is coming from someplace they don't know about - like heat from the environment, the turning of the earth, the energy that can be stored in non-permanent magnets etc.) or they're wrong AND they're a scam, aimed to con investors out of their money. As a physicist, I know it's shortsighted to say something can or can't be done with absolute certainty, as we've had so many examples in the past of people being proved wrong. However, with the current understanding of physics "free energy" machines are (sadly) a impossible. Until someone is willing to allow their invention to be fully investigated and documented by able, qualified people, it's best to avoid being drawn in by such hype & pseudoscience. dreamcatcher23 (talk) 14:24, 6 April 2008 (UTC)
thread_title: Free energy

message: In the specifications of many magnets, it shows BH(Max) as a range of MGOe (for example, http://www.hitachimetals.com/product/permanentmagnets/neodymium/properties.cfm), and the "N" rating appears to be a bit lower than the median of that range.  The article says, "The number after the N represents the magnetic energy product, in megagauss-oersteds (MGOe)..."  The Hitachi Metals page shows that their HS-55AH product has a range of 53-56MGOe, but I've seen no indication that this is marketed as an N56 magnet.  Does anyone know how the "N" number is being calculated from the BH(Max) range?  I think the article would be improved by adding that detail. Fungicord (talk) 11:19, 1 January 2008 (UTC)
thread_title: N and BH(Max)

message: I noted that all references are for commerical sites. The following one has (comparatively) lots of useful info:
http://www.kjmagnetics.com/faq.asp
as we know, 99% of the world neodymium magnets is produced in china, you can come here to find all kinds of magnets from grade35 to grade 52.
http://buyneomagnets.com/  — Preceding unsigned comment added by 47.89.22.26 (talk) 15:49, 5 April 2017 (UTC)
thread_title:  One more reference 

message: I once saw in a mythbusters episode where they did wipe a credit card with a NIB
it was in the eel wallet episode
does that count as a citation?  —Preceding unsigned comment added by 69.230.121.21 (talk) 16:22, 13 March 2008 (UTC)
replies: text: It does count if you know which episode it was, and can quote it accurately; citations don't have to be printed materials.- (User) Wolfkeeper (Talk) 16:37, 7 January 2009 (UTC)
thread_title:  NIB wiping credit cards 

message: Under "Description", it states that "As of 2008 neodymium magnets cost about $44/kg, $1.40 per BHmax.". I had removed this information since I feel it's irrelevant to an encyclopedic entry. 
Someone then undid my revision, and re-instated the price.
I am removing this information once more, since I stand by my assertion that price information is irrelevant to the description of a magnet  —Preceding unsigned comment added by 24.18.216.212 (talk) 16:22, 7 January 2009 (UTC)
replies: text: Yeah, you assert that a rough idea of price is irrelevant. With all due respect, I completely disagree, it is part of knowledge to have an idea what the material costs of things are; and on the contrary IMO all materials should have this.- (User) Wolfkeeper (Talk) 23:53, 7 January 2009 (UTC)
replies: text: Relative cost is fine in my opinion also. On the other hand, the numerous links to particular companies selling their wares is inappropriate. Wellspring (talk) 03:03, 28 January 2009 (UTC)
thread_title:  Why is the price relevant??? 

message: Different topic: What's the Wikipedia policy on posting commercial sites?  I see a listing of a site that sells magnets, but then, what's to stop ten others from listing their sites too?  Or, is listing a commercial site where neodymium magnets are available for sale OK?
I ask, because I want to add an external link to a great magnet pull-strength calculator I found at the KJ site.  Thoughts? Mc013579 (talk) 02:49, 24 September 2009 (UTC)
replies: text: In general, no links to commercial sites should be listed.  You can read Wikipedia's policy here: WP:EL  Deli nk (talk) 00:02, 25 September 2009 (UTC)
replies: text: Yes, I've read that policy, and it does not say that, "no links to commercial sites should be listed."  It does say, "#14 (No) Lists of links to manufacturers, suppliers or customers."  This isn't that.  While I agree that we shouldn't have posting links to half a dozen different magnet suppliers, a link to a useful tool should be acceptable.  So, deleting the link to Magnequench is fine (it was just a link to their general site, a place you can buy magnets).  However, the link to the kjmagnetics magnet calculator (http://www.kjmagnetics.com/calculator.asp) is a pretty useful tool.  While it is on a commercial site that also sells magnets, it seems to be a unique tool that's a freely available resource.  Appropriate, no? Mc013579
omomagnets neodymium magnets (http://www.omomagnets.com/)  — Preceding unsigned comment added by 2001:E42:102:1513:160:16:75:94 (talk) 09:02, 11 April 2016 (UTC)
thread_title: External links to commercial site

message: An interesting item I came across was a passing reference to brass wedges in some text referring to working with large high-flux magnets, such as NdFeB. They must be for keeping magnets from snapping together, as well as for prying them apart.
I just wrote the safety note about not pulling free when one starts to get pinched, and it's based on personal experience. In my case, I was foolish and did pull free, and left a little "biological sample" between the magnets. My injury was not serious and healed quickly, but just before I broke free, the squeeze was like that of the jaws of a pair of high-leverage pliers being handled my somebody both physically strong and malicious.
Nikevich (talk) 11:52, 20 October 2009 (UTC)
thread_title: Brass wedges

message: Material : Nd2Fe14B + other rare earth material
Properties: 
N35,N38,N40,N42,N45,N48,N50,N52            working temperature:80 deg.
N33M,N35M,N38M,N40M,N42M,N45M,N50M  working temperature:100 deg.
N30H,N33H,N35H,N38H,N40H,N42H,N45H,N48H  working temperature:120 deg.
N30SH,N33SH,N35SH,N38SH,N40SH,N42SH,N45SH  working temperature:150 deg.
N28UH,N30UH,N35UH,N38UH,N40UH  working temperature:180 deg.
N38EH,N30EH,N35EH,N38EH   working temperature:200 deg. 
 
I found this on a manufacturer's website thoght it may help with the grades question  —Preceding unsigned comment added by 75.131.229.64 (talk) 06:27, 7 November 2009 (UTC)
replies: text: Great information!  Go ahead and add it to the article.  Do you still have the address of the website so a reference to the source can be included?  --ChetvornoTALK 06:34, 13 December 2009 (UTC)
thread_title:  some more info on grades of these magnets 

message: These devices are new on the market. That means poor experience with handling. Therefore some risks are relevant. Children may be seriously injured, when there are some of this small pieces are in the stomach. Elektronic devices are easily destroyed. Datas stored on magnetic devices may be cleared. No sewing, drilling etc ist allowed. A remark should be added. Excuse my English.--Kölscher Pitter (talk) 10:23, 12 December 2009 (UTC)
replies: text: Added a section on 'Hazards' covering these points. --ChetvornoTALK 16:58, 24 June 2010 (UTC)
thread_title:  Warning 

message: From the introduction: "This material is currently the strongest type of permanent magnet." There should be a date, or at least a year. c.pergiel (71.117.211.59 (talk) 06:41, 24 January 2010 (UTC)
replies: text: Yes, usually we put a template which inserts current date, but in this case, things don't change quickly and if there is a stronger magnet, you'll hear that in the news :-) Materialscientist (talk) 06:46, 24 January 2010 (UTC)
thread_title:  Date 

message: To address certain urban myths, is there a point where two magnets attract each other so strongly that if they were to get too close to each other, they would destroy each other? 213.66.207.185 (talk) 13:13, 21 February 2010 (UTC)
replies: text: The material is very brittle, and if two magnets are allowed to get close enough to "snap" together, they may hit each other with enough force to chip and shatter.  Is that what you were referring to? --ChetvornoTALK 16:56, 24 June 2010 (UTC)

text: I added a section on 'Hazards' covering this.  --ChetvornoTALK 16:56, 24 June 2010 (UTC)
thread_title:  Size/strength/proximity limits 

message: Resistivity should read 160 micro ohms-cm, the "m" as written may seem misleading. http://www.kjmagnetics.com/specs.asp  <a href="http://www.omomagnets.com/index.php?controller=categorylist&id_category=8">Neodymium Disc Magnets</a> ?—Preceding unsigned comment added by 198.253.49.6 (talk) 15:25, 24 June 2010 (UTC)
thread_title:  Resistivity error 

message: NIB magnèts' specific impulse is only 11 m/s.  Maybe this is why it's better to put them in series in any Gauss gun, until they shatter.  For that, I need to find their celerity. -lysdexia 19:24, 4 December 2010 (UTC)
thread_title:  Pfft. 

message: During this series of edits, a user with an apparent COI significantly rewrote the article and a lot of old material was lost. Unfortunately nobody seems to have noticed this at the time. The pre-rewrite version should be examined for useful content and that content re-added, along with fixing the parts of the article which have been broken since that time (for instance, the "[1]" pseudo-reference which the COI editor presumably intended to refer to the website added during the rewrite). Chris Cunningham (user:thumperward: not at work) - talk 08:38, 14 January 2011 (UTC)
thread_title:  Broken rewrite 

message: Please describe why flux or field gradient is correct and what would cause a valid description of the nature of such a device to fail to qualify as a valid entry when written.  — Preceding unsigned comment added by 67.247.50.141 (talk) 18:45, 24 July 2011 (UTC)
replies: text: Flux is the intensity of the field, gradient is the difference in the intensity over a certain distance divided by that distance (i.e. spatial speed of changes). The field itself acts only on moving objects whereas the gradient acts on the stationary objects too. The reference you were adding is not a reliable source. Materialscientist (talk) 22:41, 24 July 2011 (UTC)
thread_title:  Flux vs Field Gradient 

message: I recently took a class discussing these magnets, and the ubiquity of NdFeB in technology (like earbud headphones) has more to do with their ability to hold onto their magnetic field than the strength of their magnetic field.  The AlNiCo technically have a slightly stronger field (specifically, increased magnetic flux density), but they become demagnetized easily in the presence of other magnetic fields.  Because NdFeB magnets have comparable strength and do not demagnetize as easily, they have largely replaced AlNiCo magnets, especially in applications where there is frequent exposure to magnetic fields such as in speakers.  — Preceding unsigned comment added by 174.97.166.196 (talk) 12:41, 2 August 2011 (UTC)
thread_title:  Relative Strength of AlNiCo and NdFeB Magnets 

message: I was wondering,  since neodymium is so good for magnets,  it would be an awesome material for electric transformers,  they would be way smaller and lighter  — Preceding unsigned comment added by Granito diaz (talk • contribs) 00:39, 1 September 2012 (UTC)
replies: text: That's a good thought, but actually it's just the opposite; the neodymium alloy (NdFeB) used in magnets would make a terrible transformer core.  In addition to high magnetic permeability, alloys used for magnets must have high coercivity (a wide hysteresis loop)  which means it takes a lot of energy to reverse their magnetization, so the magnet will be very hard to demagnetize.  These are called hard ferromagnetic materials.  However in a transformer core the magnetic field is constantly reversing, 120 times per second, because of the alternating current.  So you want a magnetic material with low coercivity, that takes very little energy to reverse the magnetization (long narrow hysteresis loop), because the energy required to reverse the magnetic field is wasted as heat (core losses).  These are called soft magnetic materials.   NdFeB has some of the highest coercivity values known.  --ChetvornoTALK 02:46, 1 September 2012 (UTC)
thread_title:  Neodymium transformer? 

message: This is in the 'description' section.
What does HA mean? Link to something or spell it out.  — Preceding unsigned comment added by 129.65.182.51 (talk) 20:05, 27 February 2014 (UTC)
thread_title:  (HA~7 teslas) needs a description 

message: Hi all... I appreciate the time taken to read this.
I was wondering if a Neodymium magnet can be melted in a kiln and yet maintain its magnetic capacities.
Hebert Peró (talk) 15:46, 6 March 2014 (UTC)
thread_title:  Neodymium magnet and ceramics 

message: "two-layered copper-nickel plating "
This is not right. The standard plating is nickel-copper-nickel. I work for one of the major magnet companies in the US, and no one has ever spec'd out Cu-Ni.  — Preceding unsigned comment added by 74.8.36.5 (talk) 12:22, 23 May 2014 (UTC)
replies: text: Could you provide a reference to a WP:RS?  Reify-tech (talk) 13:34, 23 May 2014 (UTC)
thread_title:  Magnet Coating 

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thread_title:  External links modified 

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thread_title:  External links modified (February 2018) 

message: There seems to be a lot of partial duplication as well as gaps in coverage, when this article is compared with the Rare-earth magnet article. Sections such as on Hazards, Applications, Corrosion, and research on reduction of rare-earth usage should be consolidated into one article or the other, and cross-referenced. This article should focus on details specific to neodymium magnets, and the other article should focus on what the various rare-earth magnet types have in common.  Reify-tech (talk) 19:05, 13 March 2020 (UTC)
thread_title: Overlap with [[Rare-earth magnet]] article

message: The article bonded neo seems to have some significant overlap. Should it be merged in here? --Nanite (talk) 18:45, 31 January 2021 (UTC)
thread_title:  Merge in [[Bonded neo]] ? 

message: I've come across a couple sources (probably more) that mention Norman Koon and Badri Das (at US Naval Research Laboratory) as the guys who first tried this rare earth - iron - boron combination.
https://www.terramagnetica.com/2009/09/13/a-forgotten-figure-in-the-evolution-of-rare-earth-permanent-magnets/
https://www.arnoldmagnetics.co.uk/wp-content/uploads/2017/10/Demand-for-rare-earth-materials-in-permanent-magnets-Constantinides-COM-2012-psn-hi-res.pdf (page 18)
Interesting, maybe worth mentioning.
--Nanite (talk) 06:20, 5 May 2021 (UTC)
thread_title:  Norm Koon & Badri Das 

message: I suggest merging Bonded neo into Neodymium magnet (as Nanite suggested a couple of years ago). The former doesn't seem to quite merit a stand-alone article; I think any worthwhile content from it could easily fit into the relevant section here.  — Moriwen (talk) 14:41, 18 April 2023 (UTC)
replies: text: Sounds reasonable to me. It's not clear what the actaul distinction is between the two types, so this should be clarified in the merged article.  Reify-tech (talk) 15:43, 18 April 2023 (UTC)

text: Yes, please do this. I was about to nominate bonded neo at AFD. - UtherSRG (talk) 11:42, 16 June 2023 (UTC)

text: Support the merger --ChetvornoTALK 11:48, 16 June 2023 (UTC)
thread_title:  Merger proposal