Relaxation mechanism of magnetic particles is crucial in differentiating particles and estimating temperature and viscosity for diagnosis and treatment. The magnetization recovery process in field flat phase of pulsed excitation generates decay signals that can be fitted by a bi-exponential model. The relaxation time spectrum can be generated by using inverse Laplace transform. The identification of Néel and Brownian relaxation times was implemented through the experiments of exciting solidified synomag-D samples with different gelatin concentrations in a trapezoid waveform relaxometer.
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