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

Sartori, Kevin; Lopez-Martin, Raul; Choueikani, Fadi; Gloter, Alexandre; Grenèche, Jean-Marc; Begin-Colin, Sylvie; Taverna, Dario; De Toro, Jose A.; Pichon, Benoit P.

doi:10.1039/d3na01108a

Nanoscale Adv.

2024

DOI: 10.1039/d3na01108a

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

Kevin Sartori,

Raul Lopez-Martin,

Fadi Choueikani

et al.

Abstract: A series of exchange-coupled magnetic nanoparticles combining several magnetic phases in an onion-type structure was synthesized by a three-step seed-mediated growth process. Iron and cobalt precursors were alternately decomposed in...

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Magnetic Anisotropy and Interactions in Hard/Soft Core/Shell Nanoarchitectures: The Role of Shell Thickness

Omelyanchik,

Villa,

Locardi

et al. 2024

Chem. Mater.

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In this work, the influence of shell thickness on the magnetic behavior of hard cobalt ferrite (CoFe2O4) nanoparticles coated with one or more layers of magnetically soft nickel ferrite (NiFe2O4) was investigated. The materials were chosen as model soft and hard magnetics due to their significant difference in the magnetic anisotropy constant, which spans 2 orders of magnitude. The obtained magnetic nanoarchitectures are compositionally graded single crystals, i.e., they comprise a crystallographic coherence of core and shell with no visible core–shell interface at the atomic level. The CoFe2O4 core exhibited an average size of ∼9 nm, while the NiFe2O4 shells were engineered with varying thicknesses of ∼1, 3, and 6 nm. The core/shell nanoarchitectures behave as a single magnetic unit, i.e., in the rigid exchange coupling regime. Nonmonotonic variation of the coercivity with the shell thickness is observed that is attributed to the competition of the different magnetic anisotropies, such as magneto-crystalline and surface, interplaying with the interparticle dipolar interactions. The experimental findings are in good qualitative agreement with Monte Carlo simulation results for a mesoscopic model that includes both the nanoparticle morphology and interparticle interactions.

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Magnetic Anisotropy and Interactions in Hard/Soft Core/Shell Nanoarchitectures: The Role of Shell Thickness

Omelyanchik,

Villa,

Locardi

et al. 2024

Chem. Mater.

View full text Add to dashboard Cite

show abstract

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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 was synthesized by a three-step seed-mediated growth process. Iron and cobalt precursors were alternately decomposed in...

Cited by 1 publication

References 56 publications

Magnetic Anisotropy and Interactions in Hard/Soft Core/Shell Nanoarchitectures: The Role of Shell Thickness

Magnetic Anisotropy and Interactions in Hard/Soft Core/Shell Nanoarchitectures: The Role of Shell Thickness

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