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July 19, 2013

Magnetic moment

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 ...
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July 19, 2013

Magnetic field

The magnetic field (usually denoted B) is called a field because it has a value at every point in space. The magnetic field (at a given point) is specified by two properties:(1) its direction, which is ...
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July 19, 2013

Comparisons between Neodymium Iron Boron magnets and Samarium Cobalt magnets

Neodymium Iron Boron magnets have some advantages over Samarium Cobalt magnets. Neodymium Iron Boron magnets are less expensive, since the main elements Nd and Fe are abundant, and are mechanically stronger. High energy products can be ...
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July 19, 2013

Magnetic metallic elements

Many materials have unpaired electron spins, and the majority of these materials are paramagnetic. When the spins interact with each other in such a way that the spins align spontaneously, the materials are called ferromagnetic (what ...
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July 19, 2013

Bipolar permanent magnets for a pilot study

Chronic low back pain is one of the most prevalent and costly medical conditions in the United States. Permanent magnets have become a popular treatment for various musculoskeletal conditions, including low back pain, despite little scientific ...
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July 19, 2013

Alnico and Alcomax Permanent Magnets

Many strong permanent magnets have been made from alloys of aluminum, nickel and cobalt with iron. Alnico and alcomax are two of the trade names of such alloys. Small amounts of Cu, Ti and Nb may also ...
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July 19, 2013

Permanent Magnets

Centuries ago, it was discovered that certain types of mineral rock possessed unusual properties of attraction to the metal iron. One particular mineral, called lodestone, or magnetite, is found mentioned in very old historical records (about ...
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July 19, 2013

Coercivity and Remanence in Permanent Magnets

A good permanent magnet should produce a high magnetic field with a low mass, and should be stable against the influences which would demagnetize it. The desirable properties of such magnets are typically stated in terms ...
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