Magnetic properties of nanocrystalline barium ferrite at high temperatures

Magnetic properties of nanocrystalline barium ferrite at high temperatures

In this work we try to clarify whether intergranular exchange coupling in nanocrystalline barium ferrite with grain sizes down to 40 nm can be achieved. From room temperature up to the Curie temperature T C (723 K), a M R/ M S of 0.5 was found and no evidence for exchange coupling was obtained. A di...

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Veröffentlicht in:Journal of magnetism and magnetic materials 2002-04, Vol.242, p.1468-1470
Hauptverfasser: Kerschl, P., Grössinger, R., Kussbach, C., Sato-Turtelli, R., Müller, K.H., Schultz, L.
Format: Artikel
Sprache:eng
Schlagworte:
Exchange coupling—insulators
Magnetic viscosity
Stoner–Wohlfarth model
Temperature effects
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Zusammenfassung:In this work we try to clarify whether intergranular exchange coupling in nanocrystalline barium ferrite with grain sizes down to 40 nm can be achieved. From room temperature up to the Curie temperature T C (723 K), a M R/ M S of 0.5 was found and no evidence for exchange coupling was obtained. A difference in the determined coercive field with different field pulse duration is attributed to magnetic viscosity.
ISSN:0304-8853
DOI:10.1016/S0304-8853(01)01105-2