The influence of a demagnetizing field on hysteresis losses in a dense assembly of superparamagnetic nanoparticles

Гудошников, С.А.; Liubimov, B.Ya.; Popova, A. V.; Usov, N. A.

doi:10.1016/j.jmmm.2012.05.049

Cited by 20 publications

(13 citation statements)

References 19 publications

(34 reference statements)

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“…However, the experimentally measured SAR values for assemblies of iron oxides nanoparticles are, as a rule, significantly below [18][19][20][21] these theoretical values. As we shall see in the next section, this fact can be explained [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] by the influence of strong magnetodipole interaction in dense assemblies of magnetic nanoparticles.…”

Section: Results and Discussion Non Interacting Iron Oxide Nanoparticlesmentioning

confidence: 99%

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Interaction Effects in Assembly of Magnetic Nanoparticles

2017

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A specific absorption rate of a dilute assembly of various random clusters of iron oxide nanoparticles in alternating magnetic field has been calculated using Landau–Lifshitz stochastic equation. This approach simultaneously takes into account both the presence of thermal fluctuations of the nanoparticle magnetic moments and magneto-dipole interaction between the nanoparticles of the clusters. It is shown that for usual 3D clusters, the intensity of the magneto-dipole interaction is determined mainly by the cluster packing density η = N p V/V cl, where N p is the average number of the particles in the cluster, V is the nanoparticle volume, and V cl is the cluster volume. The area of the low frequency hysteresis loop and the assembly-specific absorption rate have been found to be considerably reduced when the packing density of the clusters increases in the range of 0.005 ≤ η < 0.4. The dependence of the specific absorption rate on the mean nanoparticle diameter is retained with an increase of η, but becomes less pronounced. For fractal clusters of nanoparticles, which arise in biological media, in addition to a considerable reduction of the absorption rate, the absorption maximum is shifted to smaller particle diameters. It is found also that the specific absorption rate of fractal clusters increases appreciably with an increase of the thickness of nonmagnetic shells at the nanoparticle surfaces.

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Section: Results and Discussion Non Interacting Iron Oxide Nanoparticlesmentioning

confidence: 99%

“…Indeed, it has been experimentally shown [22,23] that the SAR in the dense assembly of magnetic nanoparticles essentially depends on the aspect ratio of the test sample, i.e. the ratio of sample length to width.…”

Section: Introductionmentioning

confidence: 99%

Interaction Effects in Assembly of Magnetic Nanoparticles

2017

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“…Дискретность решеточных структур наночастиц, связанных преимущественно диполь-дипольным взаимодействием, приводит к существенным отличиям их равновесных состояний и динамического поведения от аналогичных свойств макроскопических монодоменных объектов [1][2][3][4][5]. На изменении равновесной конфигурации магнитных моментов под воздействием импульса магнитного поля основана возможность записи информации на решетках магнитных диполей [6,7].…”

Section: Introductionunclassified

Мультистабильность Дипольной Наноячейки При Ее Импульсном Перемагничивании

Шутый¹,

Семенцов²

2020

Физика Твердого Тела

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Dynamics of pulse magnetic reversal of nanocell, composed of two magneto-one-axis nanoparticles, by short Gaussian pulse of magnetic field, was investigated. Such a dipole-bound system is multi-stable and has four equilibrium states. The conditions under which the nanocell is re-magnetized into one of three states or returned to the original configuration are revealed. It was shown that the nature of precession dynamics of magnetic moment and the choice of the final state of the nanocell depend on the amplitude and duration of the pulse, as well as on the mutual orientation of the light axes.

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“…Благодаря малому размеру, магнитные наночастицы, как правило, однодоменны, что позволяет упростить описание структур на их основе. Основной вклад во взаимодействие наночастиц вносит диполь-дипольное взаимодействие, которое определяется не только их собственным магнитным моментом, но и локальным упорядочением частиц, а также магнитной анизотропией [8][9][10][11]. Дискретность решеточных структур наночастиц приводит к существенным отличиям равновесных состояний и динамического перемагничивания от аналогичных свойств макроскопических монодоменных объектов [12][13][14].…”

Section: Introductionunclassified

Динамика Импульсного Перемагничивания Магнитоодноосных Наночастиц

Шутый¹,

Семенцов²

2019

Физика Твердого Тела

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The magnetic moment response of a magneto-uniaxial nanoparticle and a flat lattice of similar nanoparticles are being studied under the action of a short Gaussian pulse of a magnetic field in the presence and in the absence of its modulation. The periodic dependence of the final orientation and duration of a response of the magnetic moments on the pulse duration and its peak value have been revealed and analyzed. The effect on processes magnetization reversal of a weak magnetizing field and the deviation of the pulse of field from the transverse orientation has been studied. Have been shown that the influence of the dipole-dipole interaction leads to modulation of the response to the pulse action.

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The influence of a demagnetizing field on hysteresis losses in a dense assembly of superparamagnetic nanoparticles

Cited by 20 publications

References 19 publications

Interaction Effects in Assembly of Magnetic Nanoparticles

Interaction Effects in Assembly of Magnetic Nanoparticles

Мультистабильность Дипольной Наноячейки При Ее Импульсном Перемагничивании

Динамика Импульсного Перемагничивания Магнитоодноосных Наночастиц

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