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Size effects in bimagnetic CoO/CoFe2O4 core/shell nanoparticles.

Gabriel C Lavorato1, Enio Lima, Dina Tobia

  • 1Centro Ato´mico Bariloche, CNEA-CONICET, 8400 S.C. de Bariloche, Río Negro, Argentina. Argentine-Italian Joint Laboratory of Nanomagnetism, LIANAM, Laboratorio Resonancias Magnéticas -CNEA, Argentina/Istituto di Struttura della Materia, CNR, Italy.

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Summary

Controlling bimagnetic core/shell nanoparticle size is key for new magnetic materials. Smaller CoO/CoFe2O4 nanoparticles show increased magnetic hardening, impacting their properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Controlling nanoparticle size is crucial for understanding fundamental properties.
  • Designing novel nanostructured magnetic materials requires precise size control.
  • Bimagnetic nanoparticles offer unique magnetic characteristics.

Purpose of the Study:

  • To synthesize and characterize bimagnetic CoO/CoFe2O4 core/shell nanoparticles.
  • To investigate the influence of particle size on structural and magnetic properties.
  • To explore size-dependent magnetic hardening and blocking temperature.

Main Methods:

  • Seed-mediated growth via high-temperature decomposition.
  • Synthesis of CoO/CoFe2O4 core/shell nanoparticles (5-11 nm).
  • Structural and magnetic characterization techniques.

Main Results:

  • Core/shell morphology enhances shell phase crystallinity.
  • Reduced particle size significantly increases magnetic hardening.
  • Coercive field at 5 K increased from 21.5 kOe to 30.8 kOe with size reduction.
  • Blocking temperature decreased from 388 K to 167 K as particle size decreased.

Conclusions:

  • Particle size is a critical factor in the magnetic behavior of CoO/CoFe2O4 nanoparticles.
  • Size effects can be modeled using a phenomenological approach for coupled magnetic phases.
  • Findings advance the design of tailored nanostructured magnetic materials.