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Study on Magnetic Particle Relaxation Detection Device Based on AC Magnetic Susceptibility

In this paper, a magnetic nanoparticle relaxation detection device based on AC susceptibility is proposed and fabricated. It has the characteristics of simple structure and easy to use. It can serve the application of magnetic nanoparticles in biology, medicine and so on. This paper first introduces the mechanism of relaxation, and obtains the equation for measuring relaxation of the device. Finally, the detection device is designed and manufactured according to this principle. It captures the magnetic signal of the magnetic particle under excitation through the coil and converts it into electric signal to complete the measurement. In the end, the device was used to measure the relaxation time for verifying the availability of the device.