Abstract
Magnetic relaxation divided into the Neel and Brownian regimes determines the magnetization dynamics. To develop the signal intensity and resolution of magnetic particle imaging, understanding the magnetization dynamics was required. In this study, the Neel and Brownian relaxations were individually evaluated. The two-step magnetization response of magnetic nanoparticles dispersed in a fluid as the Brownian regime occurred after the Neel regime was observed by applying a fast responding pulse field. To clarify the magnetic relaxation in detail, it is necessary to individually observe the Neel and Brownian relaxations in the superposition system. By fitting the theoretical calculation to the measured time evolution of the magnetization response, we isolated Neel and Brownian relaxations from the experimentally observed superposition relaxation system. Moreover, the effect of dipole interactions on Neel and Brownian relaxation were confirmed by measuring the dependence of magnetization responses on the particle concentration in a magnetic fluid. Int. J. Mag. Part. Imag. 6(2), Suppl. 1, 2020, Article ID: 2009005, DOI: 10.18416/IJMPI.2020.2009005
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