A magnon is a collective excitation of the electrons` spin structure in a crystal lattice. In the equivalent wave picture of quantum mechanics, a magnon can be viewed as a quantized spin wave. As a quasiparticle, a magnon carries a fixed amount of energy and lattice momentum. It also possesses a spin of ħ (where ħ is the reduced Planck constant....
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http://en.wikipedia.org/wiki/Magnon
small quantity of energy corresponding to a specific decrease in magnetic strength that travels as a unit through a magnetic substance.
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http://www.britannica.com/eb/a-z/m/12
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