Magnetic behavior of Co clusters embedded in a zeolite matrix

Magnetic behavior of Co clusters embedded in a zeolite matrix

A medium pore zeolitic material with MFI structure modified with Co cations was synthesized. The magnetization M and magnetic susceptibility χ were measured as a function of T after ZFC and as a function of the applied magnetic field for T between 4.2 and 30 K. No blocking temperature was detected a...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 2004-12, Vol.354 (1), p.137-140
Hauptverfasser: Bertorello, H.R., Pierella, L.B., Bercoff, P.G., Saux, C., Sinnecker, J.P.
Format: Artikel
Sprache:eng
Schlagworte:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Diamagnetism, paramagnetism and superparamagnetism
Exact sciences and technology
Magnetic clusters
Magnetic properties and materials
Physics
Superparamagnetism
Zeolites
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Beschreibung
Zusammenfassung:A medium pore zeolitic material with MFI structure modified with Co cations was synthesized. The magnetization M and magnetic susceptibility χ were measured as a function of T after ZFC and as a function of the applied magnetic field for T between 4.2 and 30 K. No blocking temperature was detected and a pure superparamagnetic behavior was obtained. M vs. T and χ vs. T were adjusted by Brillouin and Langevin functions obtaining the same results in both cases. Curve fitting gave an effective moment of ∼ 90 μ B for the cases under study. The results are analyzed in terms of the possible cluster structure that may appear.
ISSN:0921-4526
DOI:10.1016/j.physb.2004.09.066