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A collection of refrigerator magnets A refrigerator magnet displaying a sexual assault hotline's telephone number. A refrigerator magnet or fridge magnet is a small magnet, often attached to an artistic or whimsical ornament, which may be used to post items such as shopping lists, Christmas cards, child art or reminders on a refrigerator door, or which simply serves as decoration.
A neodymium magnet (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd 2 Fe 14 B tetragonal crystalline structure. [1] They are the most widely used type of rare-earth magnet .
Magnets are also used in other types of fastening devices, such as the magnetic base, the magnetic clamp and the refrigerator magnet. Compasses: A compass (or mariner's compass) is a magnetized pointer free to align itself with a magnetic field, most commonly Earth's magnetic field.
U.S. patent 2,535,682 was issued on December 26, 1950 – Prefabricated refrigerator construction. U.S. patent 2,581,956 was issued on January 8, 1952 – Refrigeration control device. U.S. patent 2,666,298 was issued on January 19, 1954 – Methods and means of defrosting a cold diffuser.
Canonical single-molecule magnets are the so-called Mn 12 and Fe 8 systems, with 12 and 8 transition metal atoms each and both with spin 10 (S = 10) ground states. The phenomenon of zero field magnetization requires three conditions: A ground state with finite spin; A magnetic anisotropy energy barrier; Long spin relaxation time.
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