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Forced Precession of a Ferromagnetic Nanoparticle with a Finite Anisotropy Suspended in a Liquid: Nonlinear Aspects

Authors: Liutyi, Taras Volodymyrovych; Reva, Vladyslav Valeriiovych; Petrenko, N.S.; Pavlyuk, M.O.;

Forced Precession of a Ferromagnetic Nanoparticle with a Finite Anisotropy Suspended in a Liquid: Nonlinear Aspects

Abstract

Зв'язок між механічним обертанням та внутрішньою магнітною динамікою наночастинки є важливим аспектом мікроскопічного опису поведінки фероріднини, що взаємодіє із зовнішнім полем. В нашій роботі на основі класичних рівнянь чисельно описаний детермінований випадок вимушеної сумісної прецесії. Основною метою роботи є вичерпний опис усталених режимів прецесії, які генеруються обертовим зовнішнім полем. Крім відомої однорідної прецесії, було виявлено та описано кілька нелінійних режимів. Один з них – це неоднорідна прецесія, яка була описана раніше для випадку знерухомленої наночастинки, коли частинка розглядалась як закріплена у твердій матриці, і для випадку жорсткого диполя, коли намагніченість наночастинки розглядалась як зафіксована в кристалічній решітці завдяки великій анізотропії. Скінченна анізотропія дає додаткову ступінь свободи, що призводить до виникнення хаотичного режиму та ще одного детермінованого режиму, для якого характерні коливання, що виконуються синхронно із зовнішнім полем. Глибоке розуміння характеру руху дозволяє контролювати процес нагріву під час гіпертермії – метод терапії ракових пухлин. Зокрема, тепер зрозуміло чому навіть незначна підстройка частоти поля може призвести до нелінійного зростання швидкості нагріву. The coupling between mechanical rotation and internal magnetic dynamics of each nanoparticle is an important point of the microscopic description of a ferrofluid interacting with an external field. Here, based on classical equations the deterministic case of the forced coupled precession is described numerically. Our main aim is to study the stable prerecession regimes, which are generated by a rotating external field. In addition to the well-known uniform precession motion, a few nonlinear regimes are observed and discussed. One of them is a nonuniform precession, which was described earlier for the case of an immobilized nanoparticle, where the particle is supposed to be fixed in a solid matrix, and for the case of a rigid dipole, where the nanoparticle magnetization is supposed to be locked in the crystal lattice due to the high anisotropy. Then, the finite anisotropy gives an additional degree of freedom that leads to the generation of the chaotic regime, and one more deterministic regime, which is characterized by oscillations performed synchronously with the external field. A deep understanding of the motion character allows to take control over the heating process in hyperthermia method for cancer treatment. In particular, now it is clear why even a slight tuning of the field frequency can lead to nonlinear growth of the heating rate.

Country
Ukraine
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Keywords

chaotic dynamics, ферорідина, скінченна анізотропія, ferrofluid, finite anisotropy, coupled motion, неоднорідна прецесія, зв’язаний рух, nonuniform precession, феромагнітна наночастинка, uniform precession, хаотична динаміка, ferromagnetic nanoparticle, однорідна прецесія

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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Cancer Research