Magnetic properties of FeCo-iron oxide core–shell nanoparticles investigated through first order reversal studies

Jacob, G. Antilen; Joseyphus, R. Justin

doi:10.1007/s00339-020-04176-z

Cited by 6 publications

(1 citation statement)

References 73 publications

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“…The combination of metals in a bimetallic system leads to significant improvements in various physicochemical properties. For example, Fe-Co alloy nanoparticles are one of the most popular topics in magnetic nanomaterial research due to their high Curie temperature, low coercivity (H C ), large saturation magnetization (M S ), high anisotropy constant and great magnetic permeability [11][12][13]. All of these properties can be fine-tuned by controlling the shape and size of the nanostructures [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fe-Co Alloy Nanoparticles Dispersed in Polymer-Derived Carbon Support: Effect of Initial Polymer Nature on the Size, Structure and Magnetic Properties

Vasilev,

Efimov,

Muratov

et al. 2023

Materials

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Fe-Co alloy nanoparticles with different sizes, supported by carbon derived from several polymers, namely polyacrylonitrile, polyvinyl alcohol and chitosan, have been synthesized by a one-pot method involving simultaneous metal nanoparticle formation and polymer carbonization. The method involves the joint dissolution of metal salts and a polymer, followed by annealing of the resulting dried film. Detailed XRD analysis confirmed the formation of Fe-Co alloy nanoparticles in each sample, regardless of the initial polymer used. Transmission electron microscopy images showed that the Fe-Co nanoparticles were all spherical, were homogeneously distributed within the carbon support and varied by size depending on the initial polymer nature and synthesis temperature. Fe-Co nanoparticles supported by polyacrylonitrile-derived carbon exhibited the smallest size (6–12 nm), whereas nanoparticles on chitosan-derived carbon support were characterized by the largest particle size (13–38 nm). The size dependence of magnetic properties were studied by a vibrating sample magnetometer at room temperature. For the first time, the critical particle size of Fe-Co alloy nanoparticles with equiatomic composition has been experimentally determined as 13 nm, indicating the transition of magnetic properties from ferromagnetic to superparamagnetic.

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Section: Introductionmentioning

confidence: 99%

Fe-Co Alloy Nanoparticles Dispersed in Polymer-Derived Carbon Support: Effect of Initial Polymer Nature on the Size, Structure and Magnetic Properties

Vasilev,

Efimov,

Muratov

et al. 2023

Materials

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Comprehensive Law‐of‐Approach‐to‐Saturation for the Determination of Magnetic Anisotropy in Soft Magnetic Materials

Sivaranjani

Jacob

Joseyphus

2022

Physica Status Solidi (b)

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Magnetocrystalline anisotropy is a crucial parameter that determines the suitability of magnetic material in a wide range of emerging applications. The law‐of‐approach‐to‐saturation (LAS), utilized to obtain the magnetocrystalline anisotropy from hysteresis loops, is not satisfactory for materials with cubic anisotropy as they are two orders higher than the bulk value. Herein, a modified formulation to LAS is presented, where the reduction in effective magnetic anisotropy (K) values due to Fe oxide phases in Fe particles over wide size ranges is accounted. The value of K decreases from 4.2 × 104 J m−3 for the Fe particles of average size 210 nm to 1.2 × 104 J m−3 for the 20 nm particles due to the increase in the iron oxide fraction with size reduction. The effective magnetic anisotropy obtained from the modified LAS has been validated from the ferromagnetic resonance studies for particles of the smallest size.

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Thermal characteristics of highly magnetic core/shell nanoparticles for hyperthermia: Theoretical and experimental analysis

Anandhi

Jacob

Sastikumar

et al. 2022

J Therm Anal Calorim

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Magnetic properties of FeCo-iron oxide core–shell nanoparticles investigated through first order reversal studies

Cited by 6 publications

References 73 publications

Fe-Co Alloy Nanoparticles Dispersed in Polymer-Derived Carbon Support: Effect of Initial Polymer Nature on the Size, Structure and Magnetic Properties

Fe-Co Alloy Nanoparticles Dispersed in Polymer-Derived Carbon Support: Effect of Initial Polymer Nature on the Size, Structure and Magnetic Properties

Comprehensive Law‐of‐Approach‐to‐Saturation for the Determination of Magnetic Anisotropy in Soft Magnetic Materials

Thermal characteristics of highly magnetic core/shell nanoparticles for hyperthermia: Theoretical and experimental analysis

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