Journal of Superconductivity and Novel Magnetism

, Volume 25, Issue 7, pp 2389–2393 | Cite as

Low Field Microwave Absorption in Nanostructured Ferrite Ceramics Consolidated by Spark Plasma Sintering

  • R. Valenzuela
  • S. Ammar
  • S. Nowak
  • G. Vazquez
Original Paper


The low field microwave absorption (LFMA at 9.5 GHz) properties of clusters of Zn0.5Ni0.5Fe2O4 ferrite nanoparticles (NPs) consolidated by spark plasma sintering (PSP at temperatures in the 350–500 °C range) are analyzed. LFMA measurements were carried out at 77 and 300 K. The clusters, formed by ∼6 nm NPs, were first obtained by the forced hydrolysis in a polyol method from the corresponding metal acetates. It is found that the sign of LFMA, associated with the spin arrangement in the ferrite depends on the degree of consolidation. For monodispersed NPs, no change of sign is observed at low temperatures. For the as-produced clusters and the consolidated samples, a progressive change in the sign of the signal is observed as the sintering temperature is increased. This change of sign is associated with the occurrence of the triangular or canted Yafet–Kittel spin arrangement.


Microwave absorption Ferromagnetic resonance Magnetic nanoparticles Ferrites 



Authors thank A. Alvarez (IPN, Mexico) for microwave measurements. This work was partially supported by ANR (France)-CONACyT (Mexico) grant # 139292.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Departamento de Materiales Metálicos y Cerámicos, Instituto de Investigaciones de MaterialesUniversidad Nacional Autónoma de MéxicoMéxico D.F.México
  2. 2.ITODYS, UMR-CNRS 7086Université de Paris-DiderotParis cedexFrance

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