Microcoil
![3D printing of a solenoid microcoil using a conductive mixture of polylactide and carbon nanotubes.[1]](/uploads/202501/27/-3D_printing_of_PLA-CNT_microcoil.webm5739.jpg)
![Microcoils produced by electroplating copper on Spirulina bacteria.[2]](/uploads/202501/27/Spirulina-templated_microcoils5739.jpg)
A microcoil is an tiny electrical conductor such as a wire in the shape of a spiral or helix which could be a solenoid or a planar structure. One field where these are found is nuclear magnetic resonance (NMR) spectroscopy, where it identifies radio frequency (RF) coils that are smaller than 1 mm.