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On the first evidence of exchange-bias feature in magnetically contrasted consolidates made from CoFe2O4-CoO core-shell nanoparticles

2019; Nature Portfolio; Volume: 9; Issue: 1 Linguagem: Inglês

10.1038/s41598-019-55649-y

2045-2322

Nancy Flores‐Martínez, Giulia Franceschin, Thomas Gaudisson, Sonia Haj-Khlifa, Sarra Gam‐Derouich, Nader Yaacoub, Jean‐Marc Grenèche, Nicolas Menguy, R. Valenzuela, Souad Ammar,

Magnetic properties of thin films

Abstract Hetero-nanostructures based on magnetic contrast oxides have been prepared as highly dense nanoconsolidates. Cobalt ferrite-cobalt oxide core-shell type nanoparticles (NPs) were synthesized by seed mediated growth in polyol and subsequently consolidated by Spark Plasma Sintering (SPS) at 500 °C for a few minutes while applying a uniaxial pressure of 100 MPa. It is interesting to note that the exchange bias feature observed in the core-shell NPs is reproduced in their ceramic counterparts, or even attenuated. A systematic structural characterization was then carried out to elucidate the decrease in the exchange magnetic field, involving mainly advanced X-ray diffraction, zero-field and in-field 57 Fe Mössbauer spectrometry, magnetic measurements and electron microscopy.