高场固体核磁共振（NMR）技术具有高灵敏度和多核检测能力，但在研究锂离子电池之类的顺磁材料时，过渡金属离子（如Mn³⁺、Fe³⁺等）的强顺磁效应会导致高场下磁场不均匀、谱线展宽、信号衰减、无法魔角旋转（MAS）等问题．低场条件下，顺磁效应引起的磁场畸变显著减弱，为解决这些问题提供了可能．本文通过理论分析低场环境对顺磁物质研究的优势，研制了用于0.5 T Halbach磁体的低场固体MAS探头，并构建了一套完整的低场固体MAS谱仪．实验在12 kHz转速下采集到多种顺磁样品的⁷Li NMR信号，验证了自主研制的低场固体MAS技术在顺磁样品体系中的可行性．该方案解决了高场条件下自旋边带叠加和MAS失效的问题，为顺磁材料的NMR研究提供了新途径．

High-field solid-state nuclear magnetic resonance (NMR) technology boasts high sensitivity and multi-nucleus detection capability. However, when studying paramagnetic materials like lithium-ion batteries, the strong paramagnetism of transition metal ions (such as Mn³⁺, Fe³⁺, etc.) leads to issues like magnetic field inhomogeneity, spectral line broadening, signal attenuation, and inability to perform magic-angle spinning (MAS) at high magnetic fields. Under low-field conditions, the magnetic field distortion induced by paramagnetic effects is significantly reduced, offering a potential solution to these problems. This paper presents a theoretical analysis of the advantages of low-field environments for studying paramagnetic substances. A low-field solid-state MAS probe for a 0.5 T Halbach magnet was developed. Furthermore, a complete low-field solid-state MAS spectrometer was constructed. In experiments, ⁷Li NMR signals of various paramagnetic samples were acquired at a spinning speed of 12 kHz, verifying the feasibility of the self-developed low-field solid-state MAS technology for paramagnetic samples. This approach addresses the problems of overlapping spin sidebands and MAS failure at high fields, providing a new pathway for NMR research on paramagnetic materials.