A Self‐Healing Permanent Magnet Putty for Soft Robot Skins With Force Sensing and Functional Recovery

Soft robotic skins require multifunctional materials that combine wireless sensing, adaptability, and autonomous self‐healing—capabilities not yet achieved by existing magnetorheological fluids, elastomers, or commercial magnetic putties. Here, permanent magnet putty (PMP) is presented, a dynamic polyborosiloxane–Ecoflex composite reinforced with high‐coercivity NdFeB microparticles. The effect of component ratios on PMP's properties is systematically investigated, and optimize the balance between fluidity and structural stability. PMP demonstrates self‐healing in both mechanical and magnetic domains. PMP restores up to 90% of its mechanical strength within 10 s after complete cutting, achieves 70% structural recovery from small deformations within 20 min, and recovers 80% of magnetic amplitude and magnetic response within 20 min. As a soft robotic skin, PMP enables precise force detection in the range of 5–30 N and exhibits up to twice the magnetic sensitivity ( B = 7.9 G) compared with commercial putties. Notably, PMP shows distinct magnetic recovery profiles that preliminarily validate its ability to discriminate pressing from cutting actions—an essential safety function in medical and industrial robotic applications. Beyond robotics, its combined wireless sensing, adaptability, and autonomous self‐healing open pathways toward wearable electronics and adaptive human–machine interfaces.