Yizhang Wu, Sicheng Xing, Dingyi Yang, Yihan Liu, Chi Ding, Zifeng Li, Qizhang Jiao, Anran Zhang, Ziheng Guo, Siyuan Liu, Wei Luo, Gongkai Yuan, Meixiang Wang, Y. Wang, Michael D. Dickey, Wubin Bai
Magnetic sensing enables contact-free, three-dimensional human-machine interactions (HMI) with high selectivity and resilience to environmental noise. However, conventional magnetic films, mostly obtained via vacuum deposition, remain constrained by rigidity, instantaneous response, and single-mode. Here, we report a giant magnetoimpedance ionogel (GelGMI) in which electrostatically self-assembled ferromagnetic (FM) domains are uniformly dispersed in a soft ionogel matrix. Under a magnetic field, domain moments realign to reconfigure ionic pathways, yielding pronounced magnetoimpedance while maintaining performance at >1,000% strain and across orientations. The hysteretic relaxation of domain magnetization imparts retrospective neuron-like temporal summation, realizing sequence- and context-aware interaction. In addition, the self-healable matrix supports a complementary tactile mode whose impedance contrasts with contact-free magnetic proximity, enabling expandable and bimodal recognition. GelGMI delivers a record-high sensitivity while unifying stretchable, neuromorphic, and healable capabilities for contact-free HMI systems.