Adiabatic Demagnetization — Cooling Toward Absolute Zero

This simulator renders a 3D lattice of paramagnetic spins and drives it through the two strokes of an adiabatic demagnetization refrigerator: isothermal magnetization against a heat bath, then adiabatic demagnetization at constant entropy. Each full cycle multiplies the sample temperature by the same fixed ratio, so the entropy–temperature staircase keeps descending — approaching absolute zero but, exactly as the Third Law of Thermodynamics predicts, never reaching it in any finite number of steps. Sliders set the magnetizing and residual field strengths, live readouts track temperature, field, entropy and cycle count, and the spin lattice itself visibly reorders between disorder and near-perfect alignment on every stroke.