TY - JOUR
T1 - Relationship between harmonic spectra and coercive field of immobilized magnetic nanoparticles
AU - Sasayama, Teruyoshi
AU - Yoshida, Takashi
AU - Enpuku, Keiji
N1 - Funding Information:
The authors would like to thank Dr. S. Nohara of Meito Sangyo Co., Ltd. for providing the Ferucarbotran MNP samples. This work was supported by a Grant-in-Aid for Young Scientists (B) under grant number 16K18114, and by a Grant-in-Aid for Scientific Research (S) under grant number 15H05764 from the Japan Society for the Promotion of Science (JSPS).
PY - 2017/2
Y1 - 2017/2
N2 - We studied the AC hysteresis loop and the harmonic spectra of samples containing immobilized magnetic nanoparticles (MNPs) at different values of the excitation field frequency f and amplitude H0. First, we measured the dependences of the coercive field 〈Hc〉 on f and H0. The measured dependences agreed qualitatively with the numerically predicted values. Next, we studied the relationship between 〈Hc〉 and the harmonic spectra, and found strong correlation between 〈Hc〉 and the attenuation rate of these harmonic spectra. We obtained an empirical expression for the harmonic spectra using 〈Hc〉 and a static magnetization curve for the immobilized MNPs. The expression obtained explained the experimental data well. Finally, the harmonic spectra were measured for two MNP samples with different distributions of the magnetic moment m. The MNP sample with the lower m distribution produces richer harmonic spectra for use in magnetic particle imaging.
AB - We studied the AC hysteresis loop and the harmonic spectra of samples containing immobilized magnetic nanoparticles (MNPs) at different values of the excitation field frequency f and amplitude H0. First, we measured the dependences of the coercive field 〈Hc〉 on f and H0. The measured dependences agreed qualitatively with the numerically predicted values. Next, we studied the relationship between 〈Hc〉 and the harmonic spectra, and found strong correlation between 〈Hc〉 and the attenuation rate of these harmonic spectra. We obtained an empirical expression for the harmonic spectra using 〈Hc〉 and a static magnetization curve for the immobilized MNPs. The expression obtained explained the experimental data well. Finally, the harmonic spectra were measured for two MNP samples with different distributions of the magnetic moment m. The MNP sample with the lower m distribution produces richer harmonic spectra for use in magnetic particle imaging.
UR - http://www.scopus.com/inward/record.url?scp=85011556732&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85011556732&partnerID=8YFLogxK
U2 - 10.7567/JJAP.56.025001
DO - 10.7567/JJAP.56.025001
M3 - Article
AN - SCOPUS:85011556732
SN - 0021-4922
VL - 56
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 2
M1 - 025001
ER -