TY - JOUR
T1 - Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution
AU - Du, Zhongzhou
AU - Sun, Yi
AU - Higashi, Oji
AU - Enpuku, Keiji
AU - Yoshida, Takashi
N1 - Funding Information:
This work was supported in part by Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (S) JP15H05764, Grant-in-Aid for Scientific Research (C) JP18K04170, Grant-in-Aid for JSPS Fellows JP18F18760, National Natural Science Foundation of China 61803346, and Science and Technology Program of Henan, China 192102310213.
Publisher Copyright:
© 2019 The Japan Society of Applied Physics.
PY - 2019
Y1 - 2019
N2 - It is well known that the core size of practical magnetic nanoparticle (MNP) samples is widely distributed. This study investigated an empirical expression for harmonics of AC magnetization of MNPs for magnetic nanoparticle thermometer (MNPT) and used two main core diameters to approximate the effect of the core size distribution. When the frequency of AC magnetic field was 200 Hz, the harmonics calculated from the Langevin function with two-core diameters (two-core-diameters model) agreed well with the experimental data. When the frequency was 3 kHz, where the effect of the Brownian relaxation could not be ignored, the harmonics could also be empirically expressed by the two-core-diameters model by adequately choosing the parameters of the model. The simple two-core-diameters model is useful when MNPs sample with core size distribution is used for MNPT.
AB - It is well known that the core size of practical magnetic nanoparticle (MNP) samples is widely distributed. This study investigated an empirical expression for harmonics of AC magnetization of MNPs for magnetic nanoparticle thermometer (MNPT) and used two main core diameters to approximate the effect of the core size distribution. When the frequency of AC magnetic field was 200 Hz, the harmonics calculated from the Langevin function with two-core diameters (two-core-diameters model) agreed well with the experimental data. When the frequency was 3 kHz, where the effect of the Brownian relaxation could not be ignored, the harmonics could also be empirically expressed by the two-core-diameters model by adequately choosing the parameters of the model. The simple two-core-diameters model is useful when MNPs sample with core size distribution is used for MNPT.
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U2 - 10.7567/1347-4065/ab3b7d
DO - 10.7567/1347-4065/ab3b7d
M3 - Article
AN - SCOPUS:85072838046
VL - 58
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 9
M1 - 097003
ER -