ABSTRACT This article introduces a novel and compact architecture for generating a highly uniform static magnetic field optimized for nuclear magnetic resonance (NMR) spectroscopy. The design employs the strategic integration of high‐performance N52 neodymium magnets within a precision‐machined metallic housing to establish a closed magnetic flux circuit, enhancing field homogeneity. A key innovation is the incorporation of coiled iron caps featuring uniquely optimized geometries, facilitating adjustable magnetic flux density via an external DC voltage. It was specifically optimized to mitigate field distortions and maximize the uniformity of the magnetic field within the sample volume, enabling significantly improved spectral resolution compared to conventional designs. The resulting system achieves a static magnetic field of 0.928 T with a measured uniformity of 98% within the sample volume (10 mm gap). The complete assembly, including the magnets, casing, and coils, measures 12 × 13 × 8 cm and weighs 4.5 kg, achieving both high field strength and portability. Finite Element Method (FEM) simulations conducted using COMSOL Multiphysics demonstrate excellent correlation with empirical data, validating the design's robustness and enabling iterative performance optimization. This breakthrough addresses a critical gap in the development of portable NMR devices, offering unparalleled magnetic field uniformity and resolution, thereby expanding the potential for in‐field spectroscopic analysis.
Noohi et al. (Tue,) studied this question.
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