Ferromagnetic resonance of cobalt nanoparticles in the polymer shell

Моргунов, Р. Б.; Dmitriev, A. I.; Джардималиева, Г. И.; Pomogaĭlo, A. D.; Rozenberg, A. S.; Tanimoto, Yoshifumi; Leonowicz, M.; Sówka, E.

doi:10.1134/s1063783407080173

Cited by 10 publications

(5 citation statements)

References 27 publications

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“…Complementary characterization with EPR spectroscopy suggested that the polymer shell interacts with the embedded NPs. 303 Stepanov and colleagues investigated Co and Ni NPs implanted in the SiO 2 matrix by FMR and TEM methods. FMR signals acquired at room temperature from ensembles of Co and Ni NPs implanted in SiO 2 exhibited an out-of-plane uniaxial magnetic anisotropy, typical for thin magnetic films.…”

Section: Characterization Methods For Magnetic Nanostructuresmentioning

confidence: 99%

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

2018

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Nanostructures have attracted huge interest as a rapidly growing class of materials for many applications. Several techniques have been used to characterize the size, crystal structure, elemental composition and a variety of other physical properties of nanoparticles. In several cases, there are physical properties that can be evaluated by more than one technique. Different strengths and limitations of each technique complicate the choice of the most suitable method, while often a combinatorial characterization approach is needed. In addition, given that the significance of nanoparticles in basic research and applications is constantly increasing, it is necessary that researchers from separate fields overcome the challenges in the reproducible and reliable characterization of nanomaterials, after their synthesis and further process (e.g. annealing) stages. The principal objective of this review is to summarize the present knowledge on the use, advances, advantages and weaknesses of a large number of experimental techniques that are available for the characterization of nanoparticles. Different characterization techniques are classified according to the concept/group of the technique used, the information they can provide, or the materials that they are destined for. We describe the main characteristics of the techniques and their operation principles and we give various examples of their use, presenting them in a comparative mode, when possible, in relation to the property studied in each case.

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Section: Characterization Methods For Magnetic Nanostructuresmentioning

confidence: 99%

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

2018

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“…The a H fi eld value of Fe 0.5 Co 0.5 Fe 2 O 4 nanoparticles is 25% higher than that of CoFe 2 O 4 [16]. We suppose that the contribution from both Fe 2+ and Co 2+ ions aff ect the magnetocrystalline anisotropy constant K which is involved in K H and, consequently, a H [17,18] and plays an important role.…”

Section: Parameters Of the Samplesmentioning

confidence: 99%

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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“…It is known that information recording on lattice structures of magnetic nanoparticles (NPs) is based on changing of the equilibrium configuration of magnetic moments of individual NPs due to impact of a pulse of the local magnetic field. Thereat, information can be read by exciting the formed configuration by a weak radio pulse at the frequency of ferromagnetic resonance (FMR) [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of magnetization of a uniaxial nanoparticle in the region of noncollinear ferromagnetic resonance

Шутый

Семенцов

2022

Physics of the Solid State

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Resonance dynamics of the magnetic moment of a uniaxial ellipsoidal nanoparticle under its magnetic biasing along the symmetry axis and excitation by a transverse high-frequency field is studied with the parameters (frequency, magnetic bias field and shape parameter), corresponding to the noncollinear orientation of equilibrium magnetization and the external static field. We revealed the frequency regions where precession becomes nonlinear at a weak alternating field and dynamic bistability, as well as complex spatial attractors and chaos are implemented. Keywords: ellipsoidal nanoparticle, ferromagnetic resonance, static and high-frequency field, nonlinearity, effective anisotropy, bistability, regular and chaotic precession.

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Ferromagnetic resonance of cobalt nanoparticles in the polymer shell

Cited by 10 publications

References 27 publications

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

Ferromagnetic resonance in Fe1–xCoxFe2O4 nanoparticles precipitated from diethylene glycol

Dynamics of magnetization of a uniaxial nanoparticle in the region of noncollinear ferromagnetic resonance

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