Non-exponential magnetic relaxation in magnetic nanoparticles for hyperthermia
arXiv:2001.09774 · doi:10.1016/j.jmmm.2020.167682
Abstract
Magnetic nanoparticle based hyperthermia emerged as a potential tool for treating malignant tumours. The efficiency of the method relies on the knowledge of magnetic properties of the samples; in particular, knowledge of the frequency dependent complex magnetic susceptibility is vital to optimize the irradiation conditions and to provide feedback for material science developments. We study the frequency-dependent magnetic susceptibility of an aqueous ferrite suspension for the first time using non-resonant and resonant radiofrequency reflectometry. We identify the optimal measurement conditions using a standard solenoid coil, which is capable of providing the complex magnetic susceptibility up to 150 MHz. The result matches those obtained from a radiofrequency resonator for a few discrete frequencies. The agreement between the two different methods validates our approach. Surprisingly, the dynamic magnetic susceptibility cannot be explained by an exponential magnetic relaxation behavior even when we consider a particle size-dependent distribution of the relaxation parameter.
5 pages, 4 figures, plus Supplementary Materials
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Cited by in corpus (4)
- Theory of superlocalized magnetic nanoparticle hyperthermia: rotating versus oscillating fields
- What will be the Euclidean dimension of an Ising ferromagnetic cubic shell?
- Polarised superlocalization in magnetic nanoparticle hyperthermia
- Strange relaxation and metastable behaviours of the Ising ferromagnetic thick cubic shell