Effect of Interparticle Interaction on Magnetic Hyperthermia—A Theoretical Study

2015 ◽  
Vol 4 (2) ◽  
pp. 147-150 ◽  
Author(s):  
A. F. Abu-Bakr ◽  
A. Y. Zubarev
Keyword(s):  
Theoretical Study ◽  
Magnetic Hyperthermia ◽  
Interparticle Interaction

scholarly journals Effect of interparticle interaction on magnetic hyperthermia: homogeneous spatial distribution of the particles

2019 ◽  
Vol 377 (2143) ◽  
pp. 20180216 ◽  
Author(s):  
Ali Fathi Abu-Bakr ◽  
Andrey Zubarev
Keyword(s):  
Spatial Distribution ◽  
Magnetic Moment ◽  
Characteristic Time ◽  
Theoretical Study ◽  
Magnetic Hyperthermia ◽  
Interparticle Interaction ◽  
Theme Issue ◽  
Internal Structures ◽  
Linearly Polarized ◽  
Magnetite Particles

The paper deals with the theoretical study of the effect of magnetic interparticle interaction on magnetic hyperthermia, produced by the particles under the action of a linearly polarized oscillating field. The particles are homogeneously distributed and immobilized in a rigid medium. The supposed size of the magnetite particles is about 20–30 nm. For these particles, the characteristic time of the Neel remagnetization is much longer than the time of observation. This is why we concluded that the dissipation occurs as a result of the particle magnetic moment oscillation in the pit of energy of magnetic anisotropy. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

Positive feedback of interparticle interaction on magnetic hyperthermia

2019 ◽  
Vol 489 ◽  
pp. 165402 ◽  
Author(s):  
A.Yu. Zubarev ◽  
L.Yu. Iskakova ◽  
A.P. Safronov ◽  
R.V. Krekhno ◽  
D.К. Kuznetzov ◽  
...  
Keyword(s):  
Positive Feedback ◽  
Magnetic Hyperthermia ◽  
Interparticle Interaction

scholarly journals Effect of internal chain-like structures on magnetic hyperthermia in non-liquid media

2019 ◽  
Vol 377 (2143) ◽  
pp. 20180213 ◽  
Author(s):  
Andrey Yu. Zubarev
Keyword(s):  
Theoretical Study ◽  
Linear Chain ◽  
Particle Diameter ◽  
Magnetic Hyperthermia ◽  
Heating Time ◽  
Theme Issue ◽  
Magnetic Medium ◽  
Internal Structures ◽  
Magnetite Particles ◽  
Process Observation

This paper deals with a theoretical study of the effect of chain-like aggregates on magnetic hyperthermia in systems of single-domain ferromagnetic particles immobilized in a non-magnetic medium. We assume that the particles form linear chain-like aggregates and the characteristic time of the Néel remagnetization is much longer than the time of medium heating (time of process observation). This is applicable to magnetite particles when the particle diameter exceeds 20–25 nm. Our results show that the appearance of the chains significantly decreases the intensity of heat production. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

scholarly journals On the theory of magnetic hyperthermia: clusterization of nanoparticles

2020 ◽  
Vol 378 (2171) ◽  
pp. 20190251 ◽  
Author(s):  
Ali F. Abu-Bakr ◽  
Andrey Yu. Zubarev
Keyword(s):  
Mathematical Modelling ◽  
Magnetic Anisotropy ◽  
Heat Production ◽  
Theoretical Study ◽  
Magnetic Hyperthermia ◽  
Strong Anisotropy ◽  
Theme Issue ◽  
Weak Anisotropy ◽  
Host Medium ◽  
Ferromagnetic Particles

Experiments show that clusters consisting of nano-sized ferromagnetic particles strongly affect the intensity of heat production during magnetic hyperthermia. In this paper, a theoretical study and mathematical modelling of the heat production by clusters of single-domain ferromagnetic particles, immobilized in a host medium, are presented. Two situations of strong and weak magnetic anisotropy of the particles are considered. Our results show that, in the case of strong anisotropy, the clusterization weakens the thermal effect, whereas in the case of weak anisotropy it enhances it. This article is part of the theme issue ‘Patterns in soft and biological matters'.

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