2014/02/09 by Véronica Gavrilov-Isaac, Sophie Neveu, Gavrilov-Isaac, Véronica +7
Chemistry · Materials Science · #FOS: Physical sciences #Magnetic Properties and Synthesis of Ferrites #Materials Science (cond-mat.mtrl-sci) #Nanomaterials for catalytic reactions
paper · pdf · doi:10.48550/arxiv.1402.1950
openalex publication_date 2014/02/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report the synthesis and characterization of original 'multishell' magnetic nanoparticles made of a soft core (magnetite) covered with two successive shells: a hard one (cobalt ferrite) and then a soft one (manganese ferrite). Our results show that contrary to expectations from simple models in which the coercivity of a bimagnetic core/shell nanoparticle depends simply on the proportion of soft and hard phases within that particle, the addition of a second shell made of a soft ferrite material enhances the coercivity. Taking into account the interactions between the shells themselves and the core may thus be necessary to understand the magnetic properties of such nanoparticles.