New Measurement Method for Weak Magnetic Fields Using Magnetically Induced Deformation of Chemical Bonds in Co-CsPbBr₃ Quantum Dots

The research on weak magnetic field detection is of great significance in advancing the development of bioscience, aerospace, chip manufacturing, and other fields. However, weak magnetic detection still faces some problems, including the small size of the detectors and the limited detection scale. To contribute to the detection of weak magnetic fields, the Co-CsPbBr3 colloidal quantum dots composite magnetic material was synthesized on the basis of the theory of room temperature ferromagnetism, molecular polarization, and the vibration level of chemical bonds. The synthesis involved mixing Co2+ into CsPbBr3, an all-inorganic perovskite with activated ions. Subsequently, a weak magnetic field measurement system was devised, comprising working medium samples and a vibration level detection optical path. Following the acquisition, comparison, processing, and analysis of multiple data sets, a Stokes displacement function model was established under different magnetic field sizes, and the weak magnetic field intensity range of Pitsla (pT) was measured. The Pitsla weak magnetic field measurement system proposed in this paper provides a reference for the development of noncontact weak magnetic measurement methods and for the advancement of intelligent and low-dimensional weak signal measurement applications.