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2. Quadrupole magnet - Wikipedia

   en.wikipedia.org/wiki/Quadrupole_magnet

   Quadrupole magnets are useful as they create a magnetic field whose magnitude grows rapidly with the radial distance from its longitudinal axis. This is used in particle beam focusing. The simplest magnetic quadrupole is two identical bar magnets parallel to each other such that the north pole of one is next to the south of the other and vice ...

3. Neodymium magnet - Wikipedia

   en.wikipedia.org/wiki/Neodymium_magnet

   A Nickel-plated neodymium magnet on a bracket from a hard disk drive Nickel-plated neodymium magnet cubes Left: high-resolution transmission electron microscopy image of Nd 2 Fe 14 B; right: crystal structure with unit cell marked Inventor Masato Sagawa demonstrating a NdFeB magnet's force with 2 kg bottle.

4. Magnet - Wikipedia

   en.wikipedia.org/wiki/Magnet

   A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a bar magnet, the direction of the magnetic moment points from the magnet's south pole to its north pole, [ 15 ] and the magnitude relates to how strong and how far apart these poles ...

5. Magnetorquer - Wikipedia

   en.wikipedia.org/wiki/Magnetorquer

   A magnetorquer or magnetic torquer (also known as a torque rod) is a satellite system for attitude control, detumbling, and stabilization built from electromagnetic coils. The magnetorquer creates a magnetic dipole that interfaces with an ambient magnetic field, usually Earth's, so that the counter-forces produced provide useful torque.

6. Ferrite (magnet) - Wikipedia

   en.wikipedia.org/wiki/Ferrite_(magnet)

   A small permanent magnet electric motor disassembled, showing the two crescent-shaped ferrite magnets in the stator assembly (lower left) In contrast, permanent ferrite magnets are made of hard ferrites , which have a high coercivity and high remanence after magnetization.

7. 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 ...