Nano-SiO₂@Fe₃O₄ magnetofluid modified geopolymer (NMMG) is presenting promising application potential in the field of magnetic building materials by virtue of its high magnetic permeability. This work aims to reveal the modification mechanisms of nano-SiO₂@Fe₃O₄ magnetofluid on the electromagnetic and mechanical behaviors of geopolymer matrix, thus providing theoretical guidance for the engineering applications of NMMG. The results show that the introduction of nano-SiO₂@Fe₃O₄ magnetofluid enhances the magnetic exchange energy between adjacent magnetic moments inside the geopolymer, thus weakening the coercivity by intensifying the rotation of magnetic domains inside the geopolymer, which provides a new idea for the application of NMMG in the field of soft magnetic construction materials. In addition, when the concentration of nano-SiO₂@Fe₃O₄ magnetofluid reaches 9.4 vol%, good balance is found in the electromagnetic and mechanical behaviors of NMMG material. In that regard, NMMG can achieve satisfactory mechanical performance, ensuring as well low eddy current and hysteresis losses under alternating magnetic field, which reflects its great potential in soft magnetic applications.

纳米SiO ₂ @Fe ₃ O ₄磁流体改性地质聚合物(NMMG)凭借其高导磁率在磁性建筑材料领域呈现出广阔的应用前景。本工作旨在揭示纳米SiO ₂ @Fe ₃ O _{4磁流体对}地质聚合物基体电磁和力学行为的改性机制，为NMMG的工程应用提供理论指导。结果表明，纳米SiO ₂ @Fe ₃ O ₄磁流体的引入增强了地聚合物内部相邻磁矩之间的磁交换能，从而通过强化地聚合物内部磁畴的旋转来减弱矫顽力，提供了一种新的思路。 NMMG在软磁建筑材料领域的应用。此外，当纳米SiO ₂ @Fe ₃ O ₄磁流体的浓度达到9.4 vol%时，NMMG材料的电磁性能和机械性能达到良好的平衡。在这方面，NMMG可以实现令人满意的机械性能，并确保在交变磁场下具有较低的涡流和磁滞损耗，这体现了其在软磁应用中的巨大潜力。