Temperature dependent microwave properties of Fe3O4 nanoparticles syhthezed by various techniques

Vakula, Arthur

doi:10.15407/rej2015.03.062

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The TEM images (Fig. 1, a-c) were analyzed for the MNP size distribution by the procedure described in [7]. The MNP magnetic research was performed using a commercial Quantum Design Magnetic Property Measurement System adapted to the temperature range T  2…300 K.…”

Section: Results and Discussion The Samples Of Fe 1-x Comentioning

confidence: 99%

“…The FMR properties of Fe 1-x Co x Fe 2 O 4 nanoparticles were studied in the frequency band f   8…40 GHz at the temperature T  300 K. Each MNP sample enclosed in a spherical dielectric container was placed inside a tunable rectangular microwave cavity resonator [7,14] inserted between the poles of the electromagnet and connected to the spectrometer [10,15]. The MNP samples were examined in scanning mode by applying an external magnetic fi eld in the range H  0…10 kOe.…”

Section: Results and Discussion The Samples Of Fe 1-x Comentioning

confidence: 99%

“…An apparent approach to the problem solution is to incorporate foreign, highly coercive atoms into a biocompatible MNP. Thus, Ferromagnetic resonance in Fe 1-x Co x Fe 2 O 4 nanoparticles precipitated from diethylene glycol highly coercive cobalt (Co) atoms can be doped into biocompatible, say Fe 3 O 4 , nanoparticles [7,8]. This approach does not aff ect the biocompatibility but improves the heating effi ciency of the magnetic nanoparticles.…”

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Ferromagnetic resonance in Fe1–xCoxFe2O4 nanoparticles precipitated from diethylene glycol

Vakula¹,

Kravchuk²,

Tarapov³

et al. 2020

RADIOFIZ. ELEKTRON.

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Ferromagnetic resonance in Fe 1-x Co x Fe 2 O 4 nanoparticles precipitated from diethylene glycol Subject and Purpose. One of the ways to gain in the effi ciency of the hyperthermia technique is through the synthesis of new magnetic nanomaterials off ering high coercive force without aff ecting biocompatibility. A proven technology is the doping of biocompatible materials, such as Fe 3 O 4 , with atoms of highly coercive substances, such as Co atoms. Despite it has been the theme of much investigation, magnetic state of such nanoparticles is still not completely understood. The present study is devoted to the magnetic and magnetic resonance properties of Fe 1-x Co x Fe 2 O 4 nanoparticles synthesized by the precipitation from diethylene glycol at two, T  200 °C and 500 °C, temperatures. The purpose is to study magnetic and magnetic resonance properties of Fe 1-x Co x Fe 2 O 4 nanoparticles at various concentrations x. Method and Methodology. The magnetometric method and the electron spin resonance method were employed to obtain, correspondingly, magnetic hysteresis loops of magnetic nanoparticles and ferromagnetic resonance (FMR) spectra in the frequency band f  8…20 GHz at the temperature T  294 K. Transmission electron microscopy was used for nanoparticle observations. Results. The analysis of the measuring results has shown that among Fe 1-x Co x Fe 2 O 4 nanoparticle samples with concentrations x  0.0, 0.5, and 1.0, the total magnetic anisotropy fi eld at x  0.5 is the largest of the three because its crystalline anisotropy fi eld is the largest compared to x  0.0 and 1.0. Conclusion. The presented results have advanced our understanding of the fundamental interaction between magnetic Co and Fe atoms inside the crystal lattice of AFe 2 O 4 , where A is Co or Fe. The gained knowledge can contribute to the development of magnetically controlled high-frequency fi lters and frequency selectors. Fig. 5. Table 1. Ref.: 19 items.

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Section: Results and Discussion The Samples Of Fe 1-x Comentioning

confidence: 99%

Section: Results and Discussion The Samples Of Fe 1-x Comentioning

confidence: 99%

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confidence: 99%

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Ferromagnetic resonance in Fe1–xCoxFe2O4 nanoparticles precipitated from diethylene glycol

Vakula¹,

Kravchuk²,

Tarapov³

et al. 2020

RADIOFIZ. ELEKTRON.

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Low-temperature ferromagnetic resonance in bare and SiO2 coated La0.775Sr0.225MnO3 nanoparticles

Sova

Vakula

Kalmykova

et al. 2022

Low Temperature Physics

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La0.775Sr0.225MnO3 nanoparticles were synthesized by sol-gel method with heat treatment at T = 1073 K and covered with silica shells of various thicknesses. Analysis of their experimental ferromagnetic resonance spectra was carried out in the temperature range of 77–290 K. The linewidth of absorption curves change in a nonlinear manner in coated samples in the temperature range of 230 K ≤ T ≤ 290 K. Such changes indicate the appearance of external stresses between nanoparticles due to the difference in the thermal expansion coefficients of the two materials.

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A magnetoactive metamaterial based on a structured ferrite

Polevoy¹,

Kharchenko²,

Tarapov³

et al. 2021

RADIOFIZ. ELEKTRON.

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Subject and Purpose. The use of spatially structured ferromagnets is promising for designing materials with unique predetermined electromagnetic properties welcome to the development of magnetically controlled microwave and optical devices. The paper addresses the electromagnetic properties of structured ferrite samples of a different shape (spatial geometry) and is devoted to their research by the method of electron spin resonance (ESR). Methods and methodology. The research into magnetic properties of structured ferrite samples was performed by the ESR method. The measurements of transmission coefficient spectra were carried out inside a rectangular waveguide with an external magnetic field applied. Results. We have experimentally shown that over a range of external magnetic field strengths, the frequency of the ferromagnetic resonance (FMR) of grooved ferrite samples (groove type spatial geometry) increases with the groove depth. The FMR frequency depends also on the groove orientation relative to the long side of the sample. We have shown that as the external static magnetic field approaches the saturation field of the ferrite, the FMR frequency dependence on the external static magnetic field demonstrates "jump-like" behavior. And as the magnetic field exceeds the ferrite saturation field, the FMR frequency dependence on the groove depth gets a monotonic character and rises with the further growth of the field strength. Conclusion. We have shown that the use of structured ferrites as microwave electronics components becomes reasonable at magnetic field strengths exceeding the saturation field of the ferrite. At these fields, such a ferrite offers a monotonically increasing dependence of the resonant frequency on the external magnetic field and on the depth of grooves on the ferrite surface. Structured ferrites are promising in the microwave range as components of controlled filters, polarizers, anisotropic ferrite resonators since they can provide predetermined effective permeability and anisotropy

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Temperature dependent microwave properties of Fe3O4 nanoparticles syhthezed by various techniques

Cited by 3 publications

References 3 publications

Ferromagnetic resonance in Fe1–xCoxFe2O4 nanoparticles precipitated from diethylene glycol

Ferromagnetic resonance in Fe1–xCoxFe2O4 nanoparticles precipitated from diethylene glycol

Low-temperature ferromagnetic resonance in bare and SiO2 coated La0.775Sr0.225MnO3 nanoparticles

A magnetoactive metamaterial based on a structured ferrite

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