Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution

Zhongzhou Du, Yi Sun, Oji Higashi, Keiji Enpuku, Takashi Yoshida

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number097003
JournalJapanese Journal of Applied Physics
Volume58
Issue number9
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Magnetization
alternating current
Nanoparticles
harmonics
nanoparticles
magnetization
Thermometers
thermometers
Magnetic fields
magnetic fields

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution. / Du, Zhongzhou; Sun, Yi; Higashi, Oji; Enpuku, Keiji; Yoshida, Takashi.

In: Japanese Journal of Applied Physics, Vol. 58, No. 9, 097003, 01.01.2019.

Research output: Contribution to journalArticle

@article{69d6fa2719a3432cb03cedaa22426437,
title = "Empirical expression for harmonics of AC magnetization of magnetic nanoparticles with core size distribution",
abstract = "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.",
author = "Zhongzhou Du and Yi Sun and Oji Higashi and Keiji Enpuku and Takashi Yoshida",
year = "2019",
month = "1",
day = "1",
doi = "10.7567/1347-4065/ab3b7d",
language = "English",
volume = "58",
journal = "Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes",
issn = "0021-4922",
publisher = "Institute of Physics",
number = "9",

}

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

PY - 2019/1/1

Y1 - 2019/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=85072838046&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072838046&partnerID=8YFLogxK

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 -