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Abstract <p>Magnetic interactions in composites promising for biomedical applications were studied. The composites were based on a piezoactive PVDF matrix filled with various systems of particles: hard magnetic CoFe<sub>2</sub>O<sub>4</sub> nanoparticles, a mixture of soft magnetic γ-Fe<sub>2</sub>O<sub>3</sub> and hard magnetic CoFe<sub>2</sub>O<sub>4</sub> nanoparticles, and a mixture of CoFe<sub>2</sub>O<sub>4</sub> and BaTiO<sub>3</sub> particles. The study was made by the IRM–DCD and FORC methods. It was determined that the presence of a soft magnetic phase in the composite leads to an increase in the magnetic interaction fields from ∼1300 Oe (for composites containing CoFe<sub>2</sub>O<sub>4</sub> particles) to ∼1500 Oe (for composites containing a mixture of hard and soft magnetic nanoparticles) and to the formation of two main magnetic phases in the composite.</p>

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Study of Magnetic Interactions in a Composite with a Mixture of γ-Fe2O3 and CoFe2O4 Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • V. G. Kolesnikova,
  • V. D. Salnikov,
  • A. S. Omelyanchik,
  • V. V. Rodionova

摘要

Abstract

Magnetic interactions in composites promising for biomedical applications were studied. The composites were based on a piezoactive PVDF matrix filled with various systems of particles: hard magnetic CoFe2O4 nanoparticles, a mixture of soft magnetic γ-Fe2O3 and hard magnetic CoFe2O4 nanoparticles, and a mixture of CoFe2O4 and BaTiO3 particles. The study was made by the IRM–DCD and FORC methods. It was determined that the presence of a soft magnetic phase in the composite leads to an increase in the magnetic interaction fields from ∼1300 Oe (for composites containing CoFe2O4 particles) to ∼1500 Oe (for composites containing a mixture of hard and soft magnetic nanoparticles) and to the formation of two main magnetic phases in the composite.