Microcoil

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.

[8] Different types of microcoils with different fabrication techniques are employed for NMR: Is the classical geometry to create a magnetic field with an electric current.

At the same time the coil resistance will increase linearly, so the improvement in sensitivity will be proportional to the square root of the number of turns (n).

At the same time we will have a larger ohmic heating at the center of the coil and an enhanced danger for arcing, so the optimum is generally found for only a limited number of turns.

Besides RF performance, static field distortions due to susceptibility effects are an important factor in the design of microcoil probeheads.

The saddle coil can be formed from wire, but it is also often etched from thin copper foil, which is then adhered to glass or PTFE tubing.

3D printing of a solenoid microcoil using a conductive mixture of polylactide and carbon nanotubes . ^{[

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