Magnetization Response Spectroscopy of Superparamagnetic Nanoparticles Under Mixing Frequency Fields

In this paper, we report a mixing frequency method (MFM) that has two driving fields, in which one is a high frequency of f H = 300 kHz and the other is a low frequency field with f L = 500 Hz. Two traditional magnetic particle imaging technologies are compared with an MFM, one with driving field fr...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2016-07, Vol.52 (7), p.1-4
Main Authors: Kai Wu, Batra, Akash, Jain, Shray, Jian-Ping Wang
Format: Article
Language:English
Subjects:
Harmonic analysis
Harmonics
High frequencies
Imaging
Magnetic fields
Magnetic particles
Magnetism
Magnetization
Nanoparticles
Signal to noise ratio
Spatial distribution
Spectroscopy
Strength
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Summary:In this paper, we report a mixing frequency method (MFM) that has two driving fields, in which one is a high frequency of f H = 300 kHz and the other is a low frequency field with f L = 500 Hz. Two traditional magnetic particle imaging technologies are compared with an MFM, one with driving field frequency of f M = 25 kHz and the other at 10 kHz. An assumed iron-cobalt magnetic nanoparticle (MNP) suspension of which the sizes follow normal distribution is modeled and their magnetic response is modeled by Langevin function. Odd harmonics induced from the nonlinear magnetic response of MNPs under driving fields are extracted from the magnetization response spectroscopy. The signal-to-noise ratio, harmonic strengths at field-free points (FFPs) over strengths at non-FFPs, is defined as an evaluation standard to assess which technology is better for imaging spatial distribution of MNPs.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2015.2513746