In these models,ferromagnetismis described as a cooperative phenomenon based on the interaction between the magnetic moments.
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Most of his research, however, was on magnetism, where, starting in 1938, he developed the collective electron theory offerromagnetism.
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Without quantum mechanics, there would be no diamagnetism, paramagnetism orferromagnetism.
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He carried out research in the areas of kinetic theory of gases, electrical conductivity, gas discharges, heat radiation,ferromagnetismand photochemistry.
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Likeferromagnetismand atomic spectral lines, superconductivity is a quantum mechanical phenomenon.
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The strongest effect is on permanent magnets, which have persistent magnetic moments caused byferromagnetism.
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Early investigations studied the coexistence of conventional "s" -wave superconductivity with itinerantferromagnetism.
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Other low-temperature ground states that occur in such materials are superconductivity,ferromagnetismand antiferromagnetism.
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They give rise toferromagnetism, antiferromagnetism or ferrimagnetism, depending on the nature and relative orientations of the individual spins.
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An everyday example offerromagnetismis a refrigerator magnet used to hold notes on a refrigerator door.
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In ferroics, ferroelasticity is the mechanical equivalent of ferroelectricity andferromagnetism.
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An extension of this method that allows for internal magnetic charges is used in theories offerromagnetism.
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For materials that show some other form of magnetism (such asferromagnetismor paramagnetism), the diamagnetic contribution becomes negligible.
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In order to haveferromagnetism, the atoms must have permanent magnetic moments which are not due to the motion of classical charges.
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It is closely related to ferroelectricity; the relation between antiferroelectricity and ferroelectricity is analogous to the relation between antiferromagnetism andferromagnetism.
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