Difference in AC magnetization between suspended and immobilized magnetic nanoparticles in Néel-relaxation dominant case: Effect of easy axis alignment in suspended nanoparticles

2021 ◽  
Vol 130 (11) ◽  
pp. 113903
Author(s):  
Keiji Enpuku ◽  
Ahmed L. Elrefai ◽  
Jinnya Gotou ◽  
Shuya Yamamura ◽  
Teruyoshi Sasayama ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Easy Axis ◽  
Axis Alignment ◽  
Ac Magnetization ◽  
Suspended Nanoparticles ◽  
Néel Relaxation ◽  
Case Effect

scholarly journals Evaluation of Dispersibility in Liquid and AC Magnetization Properties of Polyion Complex-Coupled Magnetic Nanoparticles

2018 ◽  
Vol 42 (2) ◽  
pp. 41-48
Author(s):  
G. Shi ◽  
S. B. Trisnanto ◽  
K. Nakai ◽  
S. Yusa ◽  
T. Yamada ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Polyion Complex ◽  
Ac Magnetization

Synthesis and investigation of precipitated ensembles of magnetic nanoparticles with controlled easy axis orientation

2017 ◽  
Vol 81 (7) ◽  
pp. 784-787
Author(s):  
R. R. Gabbasov ◽  
A. Y. Yurenya ◽  
V. M. Cherepanov ◽  
M. A. Polikarpov ◽  
M. A. Chuev ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Easy Axis ◽  
Axis Orientation

scholarly journals Empirical Expression for AC Magnetization Harmonics of Magnetic Nanoparticles under High-Frequency Excitation Field for Thermometry

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2506
Author(s):  
Zhongzhou Du ◽  
Dandan Wang ◽  
Yi Sun ◽  
Yuki Noguchi ◽  
Shi Bai ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
High Frequency ◽  
Planck Equation ◽  
Magnetization Dynamics ◽  
Excitation Field ◽  
Fokker Planck Equation ◽  
High Frequency Excitation ◽  
Frequency Excitation ◽  
Ac Magnetization ◽  
Fokker Planck

The Fokker–Planck equation accurately describes AC magnetization dynamics of magnetic nanoparticles (MNPs). However, the model for describing AC magnetization dynamics of MNPs based on Fokker-Planck equation is very complicated and the numerical calculation of Fokker-Planck function is time consuming. In the stable stage of AC magnetization response, there are differences in the harmonic phase and amplitude between the stable magnetization response of MNPs described by Langevin and Fokker–Planck equation. Therefore, we proposed an empirical model for AC magnetization harmonics to compensate the attenuation of harmonics amplitude induced by a high frequency excitation field. Simulation and experimental results show that the proposed model accurately describes the AC M–H curve. Moreover, we propose a harmonic amplitude–temperature model of a magnetic nanoparticle thermometer (MNPT) in a high-frequency excitation field. The simulation results show that the temperature error is less than 0.008 K in the temperature range 310–320 K. The proposed empirical model is expected to help improve MNPT performance.

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

2019 ◽  
Vol 58 (9) ◽  
pp. 097003 ◽  
Author(s):  
Zhongzhou Du ◽  
Yi Sun ◽  
Oji Higashi ◽  
Keiji Enpuku ◽  
Takashi Yoshida
Keyword(s):  
Magnetic Nanoparticles ◽  
Size Distribution ◽  
Core Size ◽  
Empirical Expression ◽  
Ac Magnetization

Patterning effect on easy axis alignment in permalloy thin film

1984 ◽  
Vol 20 (3) ◽  
pp. 485-488 ◽  
Author(s):  
Y. Shiroishi ◽  
K. Shiiki ◽  
I. Yuitoo ◽  
H. Tanabe ◽  
H. Fujiwara ◽  
...  
Keyword(s):  
Thin Film ◽  
Easy Axis ◽  
Axis Alignment

Model for the easy-axis alignment of chemically synthesized L10 FePt nanoparticles

2005 ◽  
Vol 87 (20) ◽  
pp. 202508 ◽  
Author(s):  
J. W. Harrell ◽  
S. Kang ◽  
Z. Jia ◽  
D. E. Nikles ◽  
R. Chantrell ◽  
...  
Keyword(s):  
Easy Axis ◽  
Fept Nanoparticles ◽  
Axis Alignment
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