Analysis and control of heating of magnetic nanoparticles by adding a staticmagnetic field to an alternating magnetic field

In this paper, we analyzed the influence of a static magnetic field (SMF), generated by apair of neodymium magnets, on the temperature rise and the specific absorption rate (SAR)of superparamagnetic nanoparticles when exposed to an alternating magnetic field (AMF).Furthermore, we attempted to verify...

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Bibliographic Details
Published in:Journal of applied physics 2019-10, Vol.126 (13)
Main Authors: Ramos, Sebastian Armando, Kim, Hyung Joon, Kim, Sung Hoon
Format: Article
Language:English
Subjects:
Applied physics
Coils
Curve fitting
Heating
Magnetic fields
Magnetic properties
Magnetic saturation
Nanoparticles
Neodymium
Permanent magnets
Solenoids
Temperature
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Summary:In this paper, we analyzed the influence of a static magnetic field (SMF), generated by apair of neodymium magnets, on the temperature rise and the specific absorption rate (SAR)of superparamagnetic nanoparticles when exposed to an alternating magnetic field (AMF).Furthermore, we attempted to verify the feasibility of controlling the SAR and steadystate temperature increase of the magnetic nanoparticles (MNP) by controlling themagnitude of the applied SMF. Magnetic heating was produced by applying a high-frequencyAMF generated by a solenoid coil and an SMF generated by using a pair of magnets; the SMFvalue could be controlled by varying the separation distance between the magnets. Weperformed two sets of experiments: in the first, heating was performed using differentamplitudes of AMF and SMF. The results showed that while the increase in temperature andSAR was maximum in the absence of an SMF, these values decreased with increasing SMFvalue, tending to zero as the nanoparticles approached their magnetic saturation state. Inthe second set of experiments, we used the curve fitting of the experimental data toobtain the required SMF value to achieve two different specific temperatures and SARvalues. The measured values of temperature rise and SAR were quite similar to thosecalculated using the curve-fitted data. Thus, the experimental results confirm thepossibility of controlling the heating properties of MNP during magnetic hyperthermiathrough an applied SMF.
ISSN:0021-8979
1089-7550