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  2. Newton disc - Wikipedia

    en.wikipedia.org/wiki/Newton_disc

    Colour distribution of a Newton disk. The Newton disk, also known as the disappearing color disk, is a well-known physics experiment with a rotating disk with segments in different colors (usually Newton's primary colors: red, orange, yellow, green, blue, indigo, and violet, commonly known by the abbreviation ROYGBIV) appearing as white (or off-white or grey) when it's spun rapidly about its axis.

  3. Alnico - Wikipedia

    en.wikipedia.org/wiki/Alnico

    Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. There are local anisotropies of different orientations without an external field due to ...

  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. Grayshift - Wikipedia

    en.wikipedia.org/wiki/Grayshift

    In 2023, it was announced that Grayshift would merge with the Canadian firm Magnet Forensics, following the latter's acquisition for $1.35 billion by investment firm Thoma Bravo, which also owned the majority of Grayshift at the time. [2] The merger was completed later the same year. [1]

  6. Magnetic space group - Wikipedia

    en.wikipedia.org/wiki/Magnetic_space_group

    Here, the addition of an apostrophe to a symmetry operation indicates that the combination of the symmetry element and the antisymmetry operation is a symmetry of the structure. There are 32 Crystallographic point groups, 32 grey groups, and 58 magnetic point groups. [21]

  7. Glass coloring and color marking - Wikipedia

    en.wikipedia.org/wiki/Glass_coloring_and_color...

    Glass coloring and color marking may be obtained in several ways. by the addition of coloring ions, [1] [2] by precipitation of nanometer-sized colloids (so-called striking glasses [1] such as "gold ruby" [3] or red "selenium ruby"), [2] Ancient Roman enamelled glass, 1st century, Treasure of Begram; by colored inclusions (as in milk glass and ...

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