A5035356277- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Theoretical and Computational Physics
- Astrophysics and Cosmic Phenomena
- Magnetic and Electromagnetic Effects
- Magnetic properties of thin films
- stochastic dynamics and bifurcation
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Magnetic Properties and Applications
- Neutrino Physics Research
- Semiconductor Quantum Structures and Devices
- Optical Polarization and Ellipsometry
- Particle Detector Development and Performance
- Nonlinear Dynamics and Pattern Formation
- Quantum and electron transport phenomena
- nanoparticles nucleation surface interactions
- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Quantum Chemical Studies
- Earthquake Detection and Analysis
- Material Dynamics and Properties
- Diffusion and Search Dynamics
- Magnetic Properties and Synthesis of Ferrites
- Liquid Crystal Research Advancements
Institute for Nuclear Research
2015-2024
Budker Institute of Nuclear Physics
2024
Siberian Branch of the Russian Academy of Sciences
2024
Novosibirsk State University
2024
Tomsk State University of Control Systems and Radio-Electronics
2020-2023
Institute of Continuous Media Mechanics
2008-2021
Russian Academy of Sciences
1983-2013
Petersburg Nuclear Physics Institute
1995-2009
Ural Branch of the Russian Academy of Sciences
2008
Landau Institute for Theoretical Physics
1993
The theory of ferromagnetic resonance (FMR) in an assembly single-domain uniaxially anisotropic particles is being applied to suspensions. approach used has, as its basis, the independent-grain model once proposed for description FMR polycrystals. We surmise that basic assumptions this are also appropriate composites fine magnetic particles. With regard specific properties systems question, we extend taking into account (i) thermofluctuational effects (superparamagnetism) and (ii)...
On the basis of Brown's kinetic equation a consistent study regimes cyclic magnetization reversal single-domain particles with uniaxial anisotropy is performed. The applied field harmonic and linearly polarized, its amplitude equals maximal coercive force Stoner-Wohlfarth particle. dynamic magnetic hysteresis loops are obtained for particle (oriented ensemble), whose easy-magnetization axis tilted to direction under an arbitrary angle. It shown that regime (often termed as quasistatic) able...
The dynamic susceptibility of concentrated ferrofluids magnetite-kerosene type is studied experimentally to clarify the effect interparticle interactions on magnetization reversal dynamics and ferrofluid relaxation time spectrum. We synthesize six samples, four which have same wide particle size distribution with a high (more than 2kT) average energy magnetic dipole interactions. These samples differ in concentration viscosity. two remaining lower content large particles moderate For all we...
Abstract Exchange bias properties of MnFe $$_2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mrow /> <mml:mn>2</mml:mn> </mml:msub> </mml:math> O $$_4$$ <mml:mn>4</mml:mn> @ $$\gamma$$ <mml:mi>γ</mml:mi> –Fe $$_3$$ <mml:mn>3</mml:mn> core–shell nanoparticles are investigated. The measured field and temperature dependencies the magnetization point out a well-ordered ferrimagnetic core surrounded by layer with spin glass-like arrangement. Quasi-static SQUID...
Energy absorption due to viscous friction in a dilute suspension of single-domain ferromagnetic particles subjected rotating field is considered. The problem treated the framework kinetic approach. behavior specific loss power (SLP) as function amplitude and frequency studied. It shown that for either these parameters (while other kept constant) SLP first grows quadratically then saturates. cases oscillating fields are compared, essential differences revealed. results obtained enable one...
A consistent theory of linear and nonlinear (cubic) initial susceptibilities an assembly uniaxially anisotropic noninteracting fine magnetic particles is presented. The expressions for the static (equilibrium) are obtained directly from pertinent statistical thermodynamics. contributions anisotropy emerge yet in first order analyzed random axes-aligned distributions. ac studied on basis micromagnetic Fokker-Planck equation. Both a numerically exact solution arbitrary frequency reliable...
Low-temperature magnetic properties of assemblies 3.3 nm sized nanoparticles (NPs) based on a MnFe2O4 core protected by maghemite shell are investigated. These NPs obtained chemical core/shell method developed for the synthesis electrostatically stabilized ferrofluid colloidal dispersions that we probe here. They model systems where interparticle interaction is tuned NP volume fractions, ranging here between 0.4% and 13.9%. It has been shown these consist well-ordered ferrimagnetic...
A mean-field theory is developed describing in what way a small amount of ferromagnetic nanoparticles embedded nematic liquid-crystalline matrix affects the order parameters and temperature nematic–isotropic phase transition. In such suspension, often termed ferronematic, ability particles to be aligned by magnetic field results occurrence partially oriented (paranematic) state above transition temperature. This fact entails possibility field-tuning both ways: up down. The pertinent...
In single-domain particles magnetic moments behave as overdamped rotary oscillators with a potential \ensuremath{\propto}${\mathrm{cos}}^{2}$\ensuremath{\vartheta}. Thus they make well-understandable object for studies of stochastic resonance (SR). With numerically exact approach, we analyze SR in superparamagnetic assemblies including situation when an external field creates controllable inequaliity the potential-well depths.
Signal-to-noise properties of a periodically driven noisy magnetic bistable system---superparamagnetic particles with uniaxial anisotropy---are investigated in the framework Fokker-Planck equation solved both analytically and numerically. The system is subject to constant (bias) field that imparts even harmonics into its low-frequency spectrum. A comparative study linear quadratic susceptibilities stochastic resonances (SR) carried out. We show SR much sharper than one unlike latter...