Building Composite Iron-Manganese Oxide Flowerlike Nanostructures: A Detailed Magnetic Study

Efisio Zuddas, Sergio Lentijo-Mozo, Alberto Casu*, Davide Deiana, Andrea Falqui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Here we show that it is possible to produce different magnetic core-multiple shell heterostructures from monodisperse Fe3O4 spherical magnetic seeds by finely controlling the amount of a manganese precursor and using, in a smart and simple way, a cation-exchange synthetic approach. In particular, by increasing the amount of precursor, we were able to produce nanostructures ranging from Fe3O4/manganese ferrite core-single-shell nanospheres to larger, flowerlike Fe3O4/manganese ferrite/Mn3O4 core-double-shell nanoparticles. We first demonstrate how formation of the initial thin manganese ferrite shell determines a dramatic reduction of the superficial disorder in the starting Fe3O4, bringing nanomagnets with lower hardness. Then, the growth of the second and most external manganese oxide shell causes magnetic hardening of the heterostructures, while its magnetic exchange coupling with the rest of the heterostructure can be either antiferromagentic or ferromagnetic, depending on the strength of the applied external magnetic field. This response is similar to that of an iron oxide-manganese oxide core-shell system but differs from what is observed in multiple-shell heterostructures. Finally, we report that the most external shell becomes magnetically irrelevant above the ferrimagnetic-paramagnetic transition of the manganese oxide, and the resulting magnetic behavior of the flowerlike structures is studied in depth.

Original languageEnglish (US)
Pages (from-to)17005-17015
Number of pages11
Issue number31
StatePublished - Aug 10 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry


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