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  4. Rare-earth magnet - Wikipedia

    en.wikipedia.org/wiki/Rare-earth_magnet

    Ferrofluid on glass, with a rare-earth magnet underneath. A rare-earth magnet is a strong permanent magnet made from alloys of rare-earth elements.Developed in the 1970s and 1980s, rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than other types such as ferrite or alnico magnets.

  5. Neodymium magnet - Wikipedia

    en.wikipedia.org/wiki/Neodymium_magnet

    Ring magnets Most hard disk drives incorporate strong magnets This manually-powered flashlight uses a neodymium magnet to generate electricity Neodymium magnets have replaced alnico and ferrite magnets in many of the myriad applications in modern technology where strong permanent magnets are required, because their greater strength allows the ...

  6. Programmable magnet - Wikipedia

    en.wikipedia.org/wiki/Programmable_magnet

    The coding theory used to design radio frequency signals in communication and radar is applied to form the magnetic regions of correlated magnets. The discovery was announced during a press conference in October, 2009, in Huntsville, Alabama. The world first's 3D magnetizing printer is developed by CMR, which is called MagPrinter.

  7. Bitter electromagnet - Wikipedia

    en.wikipedia.org/wiki/Bitter_electromagnet

    A Bitter electromagnet or Bitter solenoid is a type of electromagnet invented in 1933 by American physicist Francis Bitter used in scientific research to create extremely strong magnetic fields. Bitter electromagnets have been used to achieve the strongest continuous manmade magnetic fields on earth―up to 45 teslas , as of 2011 [update] .

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