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- W4232220005 abstract "The behaviour of a magnetic system, which becomes superparamagnetic at a blocking temperature inside its critical region, is called critical superparamagnetism. The system may consist either of small ferromagnetic particles in a non-ferromagnetic matrix, or likewise of a large crystal containing small regions with different Curie temperatures. The conditions for the existence of critical superparamagnetism are studied as functions of temperature, particle size, packing fraction, and anisotropy. The initial susceptibility of such a system depends in a characteristic manner on the measuring frequency. At a frequency corresponding to the reciprocal superparamagnetic relaxation time the susceptibility changes rather abruptly from its rotational to its superparamagnetic value. Numerical calculations are carried out for nickel showing the existence of critical superparamagnetism in this material. The susceptibility difference can reach several orders of magnitude under suitable conditions. Das Verhalten eines magnetischen Systems, dessen Blockierungstemperatur im magnetischen kritischen Temperaturgebiet liegt, wird als kritischer Superparamagnetismus bezeichnet. Das System kann aus kleinen, ferromagnetischen Teilchen in einer nicht ferromagnetischen Matrix bestehen oder aus einem großen Kristall, der kleine Bereiche mit verschiedenen Curiepunkten enthält. Die Existenzbedingungen für kritischen Superparamagnetismus werden in Abhängigkeit von Teilchengröße, Packungsdichte, Temperatur und Anisotropie untersucht. Die Anfangssuszeptibilität eines solchen Systems hängt in charakteristischer Weise von der Meßfrequenz ab. Wenn diese gleich dem Kehrwert der superparamagnetischen Relaxationszeit wird, springt die Suszeptibilität ziemlich abrupt vom Rotations- zum superparamagnetischen Wert. Numerische Berechnungen zeigen, daß dies in massivem Nickel zu erwarten ist. Der Suszeptibilitätssprung kann mehrere Größenordnungen betragen." @default.
- W4232220005 created "2022-05-12" @default.
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- W4232220005 date "1972-07-16" @default.
- W4232220005 modified "2023-10-16" @default.
- W4232220005 title "Critical superparamagnetism" @default.
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- W4232220005 doi "https://doi.org/10.1002/pssa.2210120113" @default.
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