Large Area, Cost‐Effective, and Ultra‐Fast Fabrication of Mini‐Coils Toward Noninvasive Magnetic Applications

Wearable and implantable coils are fundamental to advanced magnetic medical applications. Although the miniaturization of these coils facilitates their use in scenarios such as micromagnetic stimulation, wireless power transfer, and magnetic nanoparticle manipulation, the traditional microfabrication techniques are costly and nonenvironmentally friendly. This study presents a cleanroom‐free, simple, quick, and low‐cost fabrication method utilizing automated blade cutting to produce flexible mini‐coils. The process is versatile; it can support various materials and substrates, and it enables rapid prototyping with batch production capabilities. The resulting coils are evaluated for mechanical durability, electrical and magnetic performance, and thermal behavior. Testing under various bending conditions and multiple bending cycles demonstrates the robustness and suitability for wearable applications. Additionally, their effectiveness in resistor‐inductor filter and magnetic nanoparticles control highlights their adaptability. The findings affirm the promise of this method for producing customizable, sustainable, and scalable wearable electronic devices, paving the way for innovations in mobile healthcare technologies.