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A comment on Iron Nitride Permanent Magnets – An Alternative to Rare Earth Magnets (2014). Parent comment

Re:Iron Nitride Permanent Magnets – An Alternative to Rare E... by dEnigma on Thursday May 18, 2017 @08:22AM (#14366602)
At least earphones and speakers use permanent magnets[1], though according to Wikipedia[2] the early ones actually used electromagnets. I agree though that relays and maglev use electromagnets. I'm not sure about the rest.

[1]http://www.physics.org/article-questions.asp?id=54 [2]https://en.wikipedia.org/wiki/Loudspeaker#History

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Re:Iron Nitride Permanent Magnets – An Alternative to Rare E... by Robotbeat on Thursday May 18, 2017 @09:57AM (#14367218)
Some types of Maglev use permanent magnets: https://en.wikipedia.org/wiki/Inductrack
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Re:Iron Nitride Permanent Magnets – An Alternative to Rare E... by dEnigma on Friday May 19, 2017 @08:43AM (#14375033)
Oh, interesting. I didn't know about any project like this; thank you for the link.
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