CoFe2O4@BiFeO3 core/shell nanoparticles: Synthesis, characterization, and fingerprints of the spin disorder

•Feasible route to the production of core/shell nanostructure with pure phases.•Synthesis of CoFe2O4@BiFeO3 core/shell nanoparticles by coprecipitation.•Structural, morphological and magnetic properties in CFO@BFO.•Wasp-waisted behavior and exchange bias effect disclosing the coupling between phases...

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Veröffentlicht in:Journal of alloys and compounds 2021-12, Vol.889, p.161650, Article 161650
Hauptverfasser: Xavier, J., Silva, R.B. da, Araújo, J.C.R., Iglesias, C.A.M., Filho, E.D. Silva, Fonseca, J.L.C., Soares, J.M., Souza, P.B., Plá Cid, C.C., Gamino, M., Medeiros, S.N. de, Correa, M.A., Bohn, F.
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Sprache:eng
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Zusammenfassung:•Feasible route to the production of core/shell nanostructure with pure phases.•Synthesis of CoFe2O4@BiFeO3 core/shell nanoparticles by coprecipitation.•Structural, morphological and magnetic properties in CFO@BFO.•Wasp-waisted behavior and exchange bias effect disclosing the coupling between phases.•Spin disorder in CFO@BFO core/shell nanoparticles. We synthesize CoFe2O4@BiFeO3 core/shell nanoparticles by coprecipitation and systematically investigate the structural, morphological, and magnetic properties in such nanostructured system. Through structural and morphological characterization, we demonstrate the obtainment of core/shell nanostructure with pure phases. By performing a broad experimental magnetic analysis, we evaluate the magnetic response for the precursor phases, as well as for the core/shell nanostructure. For this latter, we identify fingerprints of the wasp-waisted behavior and exchange bias effect, disclosing the exchange coupling between the phases taking place at the interface. Further, we reveal the exchange coupling between core and shell is strongly affected by a spin glass behavior arisen from the spin disorder in the CoFe2O4@BiFeO3 core/shell nanoparticles. After all, our findings allow us to place the used procedures taking into account the coprecipitation and calcination processes as a feasible route to the production of high-quality core/shell nanostructures.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.161650