Effect of viscosity on harmonic signals from magnetic fluid

Yonetani, Takashi; Bai, Shi; Hirokawa, Aiki; Tanabe, K.; Enpuku, Keiji

doi:10.1016/j.jmmm.2014.10.044

Cited by 45 publications

(22 citation statements)

References 13 publications

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“…Orientation of the easy axes of MNPs in an AC field obtained by simulations and experiments has been reported previously [6][7][8] . The orientation of the easy axes should be considered in MPI, which uses an AC magnetic field for diagnosis.…”

Section: Introductionmentioning

confidence: 61%

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Dynamic Hysteresis Measurement of Magnetic Nanoparticles with Aligned Easy Axes

et al. 2018

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Magnetic particle imaging (MPI) is a novel diagnostic imaging technique based on the use of magnetic nanoparticles (MNPs). Investigating the magnetic properties of magnetic nanoparticles is important for achieving a high spatial and temporal resolution in MPI. In this study, -Fe2O3 nanoparticles (core diameter: dc = 4 nm), Fe3O4 nanoparticles (dc = 20-30 nm), and Resovist ® were immobilized in a DC magnetic field with their easy axes aligned. DC and AC magnetization curves were measured for the prepared MNPs. The measurements were performed by applying fields parallel and perpendicular to the easy axis and evaluating the magnetic properties of the MNPs for the easy and hard axes. The direction of magnetic moments under the AC magnetic field applied to the direction of the easy axis or hard axis was evaluated by using both experimental results and numeric simulation using the Landau-Lifshitz-Gilbert equation to reveal magnetic relaxation property at wide frequency range and the effect of core size distribution of oriented MNPs. The effect of anisotropy in superparamagnetic nanoparticles, the relaxation property depending on the anisotropy energy barrier, and the fast magnetization process of Néel relaxation were successfully observed.

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Section: Introductionmentioning

confidence: 61%

“…Therefore, the magnetic states and magnetization distribution of individual MNPs were evaluated by numerical simulations. Numerical simulations were performed using the Landau-Lifshitz-Gilbert (LLG) equation 7,16) :…”

Section: Numerical Simulationmentioning

confidence: 99%

Dynamic Hysteresis Measurement of Magnetic Nanoparticles with Aligned Easy Axes

et al. 2018

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“…In Fig. 3(1), the peak at 575 cm -1 can be assigned as the characteristic absorption of Fe-O bond [24][25][26]. In Fig.…”

Section: Characterization Methodsmentioning

confidence: 99%

Preparation and characterization of silicone-oil-based γ-Fe2O3 magnetic fluid

et al. 2016

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“…Details of the simulation procedure will be presented elsewhere. 17 Briefly, when we take the anisotropy energy into account, the magnetic energy E in the magnetic field H is given as follows: 16…”

Section: Estimation Of the Anisotropy Energy Constant And The Chmentioning

confidence: 99%

Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions

Sasayama

Yonetani

Saari

et al. 2015

Journal of Applied Physics

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We studied the distributions of the magnetic moment and magnetic volume of magnetic nanoparticles (MNPs). These distributions were estimated by applying the singular value decomposition method to the M-H curve measured in the liquid phase. The estimated distributions were compared with a mixture of log-normal distributions, and two results agree well with each other. Using the estimated distribution of the magnetic moment, we also analyzed the M-H curve of immobilized MNPs in order to estimate the average value of the anisotropy energy constant K u and the characteristic time s ON that determines the Neel relaxation of immobilized MNPs. The values K u and s ON are estimated as 4 kJ/m 3 and 1 Â 10 À9 s, respectively, for Resovist MNPs. V C 2015 AIP Publishing LLC. [http://dx.

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Effect of viscosity on harmonic signals from magnetic fluid

Cited by 45 publications

References 13 publications

Dynamic Hysteresis Measurement of Magnetic Nanoparticles with Aligned Easy Axes

Dynamic Hysteresis Measurement of Magnetic Nanoparticles with Aligned Easy Axes

Preparation and characterization of silicone-oil-based γ-Fe2O3 magnetic fluid

Comparison of volume distribution of magnetic nanoparticles obtained from M-H curve with a mixture of log-normal distributions

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