Nano-Core Logic at the kT Limit
June 5, 2025

Brian Greenforest’s open differential magnetic-amplifier fabric targets a 10,000-fold leap beyond silicon in energy and switching speed. Gapped cobalt nano-cores approach the thermal irreversibility scale while preserving the gain and cascadability that general-purpose logic requires.

Iron and nickel offer lower-cost material paths, and thin-film deposition offers a manufacturing route far lighter than a leading-edge CMOS fab.

Turn Magnetic Gain Into a Logic Fabric

Each differential element uses a driven magnetic core to control a larger output response. Complementary paths restore logic levels, reject common disturbance, and let one stage drive the next.

Magnonics and spintronics already demonstrate transistor-free gain mechanisms. The architecture organizes those mechanisms into repeatable cells, routes, state, and an FPGA-like programmable fabric.

Build the Open Post-Silicon Process

The process must connect core geometry, magnetic gap, anisotropy, thin-film composition, switching energy, frequency, windings, interconnect, and thermal behavior. Cobalt reaches the most aggressive target; iron and nickel broaden cost and fabrication options.

Open-hardware builders, device physicists, and process engineers can co-invent the cells and measurement flow. Join the work that can make post-CMOS logic radically colder, faster, and accessible without a $100 million fab.

Build the Fabrication Path Behind Nano-Core Logic at the kT Limit

The Missing Maker Fab carries this work into the tools and processes required to fabricate fast active devices locally.

The Missing Maker Fab

Originally posted on LinkedIn

Brian Greenforest · (2025-06-05 15:31:56 UTC)

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🔥 Silicon had a good run—now let’s leap 10,000× beyond it. 🔥 Imagine logic elements whose cobalt nano-cores flip at the kT irreversibility limit—the absolute floor of energy per bit. At the same footprint as today’s CMOS, that cuts power by four orders of magnitude while unlocking multi-THz switching. Prefer a cheaper stack? Swap cobalt for iron or nickel and you still get the fastest, cleanest, coldest, most efficient chips on the planet—made with nothing fancier than thin-film deposition. Magnonics and spintronics have already shown real gain without transistors; what’s missing is a cascadable, general-purpose, open platform. That’s where we come in. We’re building the first open-source differential magnetic-amplifier fabric—think FPGA flexibility, but powered by gapped-core nano-mag amps instead of silicon gates. 🔧 Open-hardware hackers, device physicists, process tinkerers—your moment is now. Help us prove that post-silicon computing can be 10,000× cooler and 10,000× faster without a $100 M fab. DM me if you’re ready to co-invent the future of logic. Let’s push past silicon together. #OpenSourceHardware #Spintronics #Magnonics #PostCMOS #NanoMagAmps #EnergyEfficientComputing

Comments added by Brian Greenforest on LinkedIn

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Adam de Delva mag amps are the only way to justify in-memory compute. Otherwise P=I^2R. More electrons we move around more heat it dissipates.

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