Pulse‐Gated Ternary Ferromagnetic Encoding for Reprogrammable Soft Micromachines

Abstract Ferromagnetic soft micromachines utilize programmable magnetization profiles for adaptive interactions and multitasking in complex environments. While recent advances in reprogrammable encoding techniques have increased design flexibility beyond static setups, most existing methods rely on slow, energy‐intensive reorientation processes that require additional stimuli, such as heating, which are limited by shallow penetration depths. Meanwhile, dynamic control over magnetization strength is still largely unexplored. To overcome these challenges, a ternary magnetization encoding scheme is introduced with three states: positive, negative, and neutralized. These states can be switched in pairs using pulsed magnetic fields. The scheme employs composite elements created by combining two ferromagnetic components with different coercive fields at adjustable ratios. Through precise partial remagnetization, fast, energy‐efficient, and fully magnetic‐field‐controlled reprogramming of the magnetization profiles is enabled. This strategy paves the way for developing intelligent soft micromachines with embedded actuation, logic operations, and information storage capabilities.