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2. Programmable magnet - Wikipedia

   en.wikipedia.org/wiki/Programmable_magnet

   Programmed magnets can be programmed, or coded, by varying the polarity and/or field strengths of each source of the arrays of magnetic sources that make up each structure. The resulting magnetic structures can be one-dimensional, two-dimensional, three-dimensional, and even four-dimensional if produced using an electromagnetic array.

3. Electropermanent magnet - Wikipedia

   en.wikipedia.org/wiki/Electropermanent_magnet

   An electropermanent magnet or EPM is a type of permanent magnet in which the external magnetic field can be switched on or off by a pulse of electric current in a wire winding around part of the magnet. The magnet consists of two sections, one of "hard" (high coercivity) magnetic material and one of "soft" (low coercivity) material. The ...

4. Promotional merchandise - Wikipedia

   en.wikipedia.org/wiki/Promotional_merchandise

   The first known promotional products in the United States were commemorative buttons dating back to the election of George Washington in 1789. During the early 19th century, there were some advertising calendars, rulers, and wooden specialties, but there was no organized industry for the creation and distribution of promotional items until later in the 19th century.

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7. Halbach array - Wikipedia

   en.wikipedia.org/wiki/Halbach_array

   Another class of design is the magnetic mangle (B), proposed by Coey and Cugat, [20] [21] in which uniformly magnetized rods are arranged such that their magnetization matches that of a Halbach cylinder, as shown for a 6-rod design. This design greatly increases access to the region of uniform field, at the expense of the volume of uniform ...