The Device Question

A local replacement for silicon has to do more than conduct, remember, or switch once in a lab setup. It has to support cascaded circuits. It has to restore levels, drive the next stage, tolerate noise, accept routing, and survive enough cycles to be worth building into a machine.

That makes the search narrower and more useful. The target is an active device process that can be fabricated, measured, repaired, taught, and repeated near the builders who depend on it.

Candidate Families

Magnetic amplifiers, ferroelectric devices, vacuum microstructures, conductive pastes, and printed active materials are interesting only if they can become process families rather than isolated demonstrations.

The useful question is not whether one device can switch once. The useful question is whether the process can make many devices with enough repeatability to build logic, control, sensing, or actuation around them.

Useful Requirements

The useful comparison is direct: which candidate process can make an active element with gain or restoration, route many of them together, run at a useful speed, tolerate real variation, and expose enough measurement points for builders to improve the process?