magnon

      small quantity of energy corresponding to a specific decrease in magnetic (magnet) strength that travels as a unit through a magnetic substance.

      In a magnetic substance, such as iron, each atom acts as a small individual magnet. These atomic magnets tend to point in the same direction, so that their magnetic fields reinforce each other. When the direction of one atomic magnet is reversed, the total magnetic strength of the group is decreased. A definite amount of energy is required to reverse such a magnet. This energy, involving the decrease in magnetic strength of the group of atoms, constitutes a magnon.

      According to the laws of quantum mechanics, the reversal of a single atomic magnet is equivalent to a partial reversal of all the atomic magnets in a group. This partial reversal spreads through the solid as a wave of discrete energy transferal. This wave is called a spin wave, because the magnetism of each atom is produced by the spin of unpaired electrons in its structure. Thus, a magnon is a quantized spin wave.

      As the temperature of a magnetic substance is increased, its magnetic strength decreases, corresponding to the presence of a large number of magnons.

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Universalium. 2010.

Look at other dictionaries:

  • Magnon — Les magnons sont des modes d excitation ou ondes de spin. Dans un milieu ferromagnétique isotrope en dessous de la température de Curie, ou dans un milieu antiferromagnétique en dessous de la température de Néel, les moments magnétiques des… …   Wikipédia en Français

  • MAGNON — MAG Quasi particule utilisée en théorie quantique du ferromagnétisme, de l’antiferromagnétisme et du ferrimagnétisme pour décrire les états collectifs faiblement excités représentés par les «ondes de spin». Dans certains corps cristallisés,… …   Encyclopédie Universelle

  • Magnon — There is a place named Magnon in Gabon. A magnon is a collective excitation of the electrons spin structure in a crystal lattice. In contrast, a phonon is a collective excitation of the crystal lattice atoms or ions. In the equivalent wave… …   Wikipedia

  • Magnon — Illustration eines ferromagnetischen Magnons. Als Magnon bzw. Magnon Quasiteilchen bezeichnet man den elementaren Anregungszustand einer magnetischen Spinwelle in Festkörpern. Voraussetzung dafür ist das Vorhandensein einer magnetischen Ordnung,… …   Deutsch Wikipedia

  • Magnon — magnonas statusas T sritis fizika atitikmenys: angl. magnon vok. Magnon, n rus. магнон, m pranc. magnon, m …   Fizikos terminų žodynas

  • magnon — noun a quantum of a spin wave …   Wiktionary

  • Magnon — Mạgnon   das, s/... nonen, ein Quasiteilchen zur Beschreibung der Elementaranregung von gekoppelten Elektronenspins in ferro , antiferro und ferrimagnetischen Festkörpern. (Spinwellen) …   Universal-Lexikon

  • Magnon — Ma|gnon* das; s, ...gnonen Kunstw.; vgl. 4↑...on> das zu den Spinwellen in magnetischen Stoffen gehörige Energiequant (Phys.) …   Das große Fremdwörterbuch

  • magnon — mag·non …   English syllables

  • magnon — ˈmagˌnän noun ( s) Etymology: magnetic (I) + on (II) : spin wave herein …   Useful english dictionary

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