New measurement method for weak magnetic fields using magnetically induced deformation of chemical bonds in Co-CsPbBr3 quantum dots

TL;DR

This paper introduces a novel weak magnetic field detection method using magnetically induced deformation of chemical bonds in Co-CsPbBr3 quantum dots, enabling precise, non-contact measurements at picotesla levels.

Contribution

The study develops a new measurement system based on quantum dots and bond vibration analysis, advancing weak magnetic field detection technology.

Findings

Achieved weak magnetic field measurement at picotesla levels.

Developed a Stokes displacement function model for different magnetic fields.

Proposed a non-contact, low-dimensional measurement system.

Abstract

The research on weak magnetic field detection is of great significance in advancing the development of bioscience, aerospace, chip manufacturing and other fields. However, the weak magnetic detecting still face some problems, including the large size of the detectors and the limited detection scale. To contribute to the detection of weak magnetic fields, the Co-CsPbBr3 colloidal quantum dots (QDs) composite magnetic material was synthesised on the basis of the theory of room temperature ferromagnetism, molecular polarisation and vibration level of chemical bond. The synthesis involved the mixing of 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 non-contact weak magnetic measurement methods and for the advancement of intelligent and low-dimensional weak signal measurement applications.