Magnetic behavior of nanofilms prepared by assembling different Co ferrite nanoparticles

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-11-25 DOI:10.1016/j.materresbull.2024.113229

Viviana B. Daboin , Julieta S. Riva , Paula G. Bercoff

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Abstract

We study the magnetic characteristics of nanofilms composed of CoFe₂O₄ nanoparticles synthesized by thermal decomposition (TD) and self-combustion (SC) methods, assembled on glass substrates using the Langmuir-Blodgett technique. Despite both synthesis methods render crystalline Co ferrite nanoparticles, the differences in particle size and saturation magnetization are notable; however, both nanofilms reveal a ferrimagnetic behavior and display a significant surface contribution to the net magnetization at temperatures below 50 K. This effect is attributed to the nanoparticles' surface spins misaligning with the spins of the ordered core and freezing into a disordered structure. Effective anisotropy K_eff values were determined, obtaining similar values to the bulk material (K_eff ∼2 × 10⁵ J/m³) for the nanofilm made of TD nanoparticles, while the nanofilm prepared with SC nanoparticles presents an enhanced value (K_eff=5 × 10⁵ J/m³). The temperature-dependent saturation magnetization curves were fitted with the modified Bloch's law and an additional term that corresponds to the frozen spins.

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.