Magnetic anisotropy engineering in onion-structured metal oxide nanoparticles combining dual exchange coupling and proximity effects.

ABSTRACT: A series of exchange-coupled magnetic nanoparticles combining several magnetic phases in an onion-type structure were synthesized by performing a three-step seed-mediated growth process. Iron and cobalt precursors were alternatively decomposed in high-boiling-temperature solvents (288-310 °C) to successively grow CoO and Fe_3-δO₄ shells (the latter in three stages) on the surface of Fe_3-δO₄ seeds. The structure and chemical composition of these nanoparticles were investigated in depth by combining a wide panel of advanced techniques, such as scanning transmission electron microscopy (STEM), electron energy-loss spectroscopy-spectrum imaging (EELS-SI), ⁵⁷Fe Mössbauer spectrometry, and X-ray circular magnetic dichroism (XMCD

SUBMITTER: Sartori K 

PROVIDER: S-EPMC11134230 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature