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Magnetic properties of fine SFMO particles: Superparamagnetism

Author:
T. Suominen   J. Raittila   T. Salminen   K. Schlesier   J. Lindén   P. Paturi  


Journal:
Journal of Magnetism and Magnetic Materials


Issue Date:
2007


Abstract(summary):

Magnetic properties of fine Sr 2FeMoO 6 (SFMO) powders were systematically studied and superparamagnetism was observed. The SFMO samples were prepared using a citrate-gel method and were characterized by X-ray diffraction (XRD), ferromagnetic resonance (FMR) and Mossbauer spectroscopy. The XRD measurements showed that the powders are nearly pure and the Rietveld refinement gave particle sizes of 31 and 197nm and antisite disorders of 10 and 15%, respectively. The 197nm crystallite size sample has a T C=415 K and a magnetic moment of 3.0 mu B/f.u. Several measurements made by SQUID magnetometer, FMR and Mossbauer spectroscopy showed that the 31nm crystallite sample behaves superparamagnetically with blocking temperature T B=35 K and it has a reduced saturation magnetization of 1.0 mu B/f.u. at 5K and effective paramagnetic moment of 3.0 mu B. [All rights reserved Elsevier]


Page:
278-284


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