A Ferromagnetic Resonance Temperature Measurement Method Based on Sweep Frequency Technique

Abstract

The ferromagnetic resonance frequency of the ferromagnetic nanoparticles has a strong temperature dependency. The frequency sweep method is a standard method to measure frequency accurately in the available technology. Based on the free energy of the spin system of single-domain ferromagnetic nanoparticles with uniaxial anisotropy, we establish a relationship model between ferromagnetic resonance frequency and temperature under the ferromagnetic resonance condition. And this model is simulated by the frequency sweep method in the temperature range of 0–60 °C, which proves that it is practicable.

Multi-Wavelength Photoacoustic Temperature Feedback Based Photothermal Therapy Method and System

“…Infrared temperature measurement is relatively mature at present, but it can only detect the surface temperature of the tissue and cannot yield temperature information of a deep target, which is mainly the result of light scattering by the tissue [ 12 , 13 ]. Although nuclear magnetic resonance temperature measurement can achieve accurate noncontact temperature measurement, it has high equipment cost and large amount of data calculation, which is not conducive to dynamic regulation of the therapy temperature [ 14 , 15 ]. Ultrasonic thermometry technology uses ultrasonic imaging parameters to estimate temperature, which meets the requirements of real-time measurement and detection depth, but the temperature measurement precision is not high enough [ 16 , 17 , 18 ].…”