Rotational properties of ferromagnetic nanoparticles driven by a precessing magnetic field in a viscous fluid

Lyutyy, T. V.; Denisov, S. I.; Reva, V. V.; Bystrik, Yu. S.

doi:10.1103/physreve.92.042312

Cited by 23 publications

(33 citation statements)

References 45 publications

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“…Two remarks are relevant here. Firstly, (20) for a small angle of the precession cone coincides with the results obtained by Xi [9] in the linear approximation. And, secondly, when the static field is absent (h z0 = 0), the obtained relationships reduced to the simpler forms: Θ = π/2, sin Φ = Ω/h, and Q = Ω 2 .…”

Section: Circularly Polarized Magnetic Fieldsupporting

confidence: 85%

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Dynamics and energy dissipation of a rigid dipole driven by the RF-field in a viscous fluid: Deterministic approach

Lyutyy

2018

Eur. Phys. J. E

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The deterministic rotation of a ferromagnetic nanoparticle in a fluid is considered. The heating arising from viscous friction of a nanoparticle driven by circularly and linearly polarized alternating magnetic fields is investigated. Since the power loss of such fields depends on the character of the induced motion of a nanoparticle, all types of particle trajectories are described in detail. The dependencies of the power loss on the alternating field parameters are determined. The optimal conditions for obtaining the maximum heating efficiency are discussed. The effect of heating enhancement by a static field is analyzed. The results obtained are actual for the description of heating in the magnetic fluid hyperthermia cancer treatment, when the size of the particles used is a few tens of nanometers.

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Section: Circularly Polarized Magnetic Fieldsupporting

confidence: 85%

“…Therefore, a simplified model, where the internal magnetic dynamics is neglected, is currently widely used [16,17,18,19,18,20,21]. Within this framework, due to the strong anisotropy, the magnetic moment is supposed to be fixed to the nanoparticle easy axis.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and energy dissipation of a rigid dipole driven by the RF-field in a viscous fluid: Deterministic approach

Lyutyy

2018

Eur. Phys. J. E

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“…(3. 16) According to them, the steady-state magnetization precessions, if they are stable, occur about the z axis with the magnetic field frequency and their direction coincides with the direction of the magnetic field rotation. The time-averaged magnetization in these precessional states, defined as…”

Section: Precessional Rotation Of Magnetically Isotropic Nanoparmentioning

confidence: 99%

“…These systems are often studied in the framework of the rigid dipole model, when the particle magnetization is assumed to be directed along the particle easy axis. This approximation, which holds if the anisotropy magnetic field is large enough, was used to study, e.g., the effects of particle rotation, dipolar interaction and thermal fluctuations [13][14][15][16][17] . The same approximation was also used to describe in an analytical way the directed transport of suspended ferromagnetic nanoparticles induced by the Magnus force [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Dissipation-induced rotation of suspended ferromagnetic nanoparticles

2019

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We report the precessional rotation of magnetically isotropic ferromagnetic nanoparticles in a viscous liquid that are subjected to a rotating magnetic field. In contrast to magnetically anisotropic nanoparticles, the rotation of which occurs due to coupling between the magnetic and lattice subsystems through magnetocrystalline anisotropy, the rotation of isotropic nanoparticles is induced only by magnetic dissipation processes. We propose a theory of this phenomenon based on a set of equations describing the deterministic magnetic and rotational dynamics of such particles. Neglecting inertial effects, we solve these equations analytically, find the magnetization and particle precessions in the steady state, determine the components of the particle angular velocity and analyze their dependence on the model parameters. The possibility of experimental observation of this phenomenon is also discussed.

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“…Using the rigid dipole model, the response to an external alternating field and the power losses were treated in terms of the complex magnetic susceptibility [13,14,15,16]. The detailed microscopic consideration of the stochastic dynamics of such nanoparticles was given in [15,17], and the influence of the dipole interaction on the power loss was studied in detail in [18]. Despite the rigid dipole model is partially valid for the system parameters, which are suit-able for hyperthermia, even small deviations of the magnetization from the easy axis can lead to the significant changes in the dissipation process.…”

Section: Introductionmentioning

confidence: 99%

Uniform and nonuniform precession of a nanoparticle with finite anisotropy in a liquid: Opportunities and limitations for magnetic fluid hyperthermia

Lyutyy

Hryshko

Yakovenko

2019

Journal of Magnetism and Magnetic Materials

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We focus on an in-depth study of the forced dynamics of a ferromagnetic single-domain uniaxial nanoparticle placed in a viscous fluid and driven by an external rotating magnetic field. The process of conversion of magnetic and mechanical energies into heat is a physical basis for magnetic fluid hyperthermia that is very promising for cancer treatment. The dynamical approximation allows us to establish the limits of the heating rate and understand the logic of selection of the system parameters to optimize the therapy. Based on the developed analytical and numerical tools, we analyze from a single viewpoint the synchronous and asynchronous rotation of the nanoparticle or/and its magnetization in the following three cases. For the beginning, we actualize the features of the internal magnetic dynamics, when the nanoparticle body is supposed to be fixed. Then, we study the rotation of the whole nanoparticle, when its magnetization is supposed to be locked to the crystal lattice. And, finally, we realize the analysis of the coupled motion, when the internal magnetic dynamics is performed in the rotated nanoparticle body. In all these cases, we describe analytically the uniform mode, or synchronous rotation along with an external field, while the nonuniform mode, or asynchronous rotation, is investigated numerically.

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Rotational properties of ferromagnetic nanoparticles driven by a precessing magnetic field in a viscous fluid

Abstract: We study the deterministic and stochastic rotational dynamics of ferromagnetic nanoparticles in a precessing magnetic field. Our approach is based on the system of effective Langevin equations and

Cited by 23 publications

References 45 publications

Dynamics and energy dissipation of a rigid dipole driven by the RF-field in a viscous fluid: Deterministic approach

Dynamics and energy dissipation of a rigid dipole driven by the RF-field in a viscous fluid: Deterministic approach

Dissipation-induced rotation of suspended ferromagnetic nanoparticles

Uniform and nonuniform precession of a nanoparticle with finite anisotropy in a liquid: Opportunities and limitations for magnetic fluid hyperthermia

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