TY - JOUR
T1 - Viscosity dependent amplitude and phase of harmonic signals of magnetic nanoparticles
AU - Farag, Ahmed Lotfy Elrefai Mohamed Mohamed
AU - Yoshida, Takashi
AU - Enpuku, Keiji
N1 - Funding Information:
This work was supported in part by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (S) JP15H05764 and Grant-in-Aid for JSPS Fellows JP18F18349 .
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - We studied effect of viscosity on harmonic signals of magnetic nanoparticles (MNP). Harmonic signals are measured when an excitation field with amplitude (~3 mT) and frequency (~10 kHz) is applied, where the relaxation mechanism of the used MNP is affected by the coexistence of Brownian and Néel processes. Viscosity dependence of amplitude and phase of fundamental, third and fifth harmonics are measured when viscosity changed from 0.89 mPa·s to 12.6 mPa·s. The measured viscosity dependences are discussed in terms of field dependent relaxation time of MNP. We also discuss a method to determine temperature and viscosity from the measured harmonic signals.
AB - We studied effect of viscosity on harmonic signals of magnetic nanoparticles (MNP). Harmonic signals are measured when an excitation field with amplitude (~3 mT) and frequency (~10 kHz) is applied, where the relaxation mechanism of the used MNP is affected by the coexistence of Brownian and Néel processes. Viscosity dependence of amplitude and phase of fundamental, third and fifth harmonics are measured when viscosity changed from 0.89 mPa·s to 12.6 mPa·s. The measured viscosity dependences are discussed in terms of field dependent relaxation time of MNP. We also discuss a method to determine temperature and viscosity from the measured harmonic signals.
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U2 - 10.1016/j.jmmm.2020.166809
DO - 10.1016/j.jmmm.2020.166809
M3 - Article
AN - SCOPUS:85082848866
VL - 507
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
M1 - 166809
ER -