London145 kilohenries of inductance from a single nickel-bromide molecule.
Inductors use wound coils; this molecule generates inductance from memristive dynamics, making coil geometry obsolete at chip scale.
The study suggests emergent inductance extends to all pinched-hysteresis devices, enabling chip-scale memory and reactive elements in one structure.
Sources: Nature
THE FOURTH ELEMENT
Resistors, capacitors, and inductors link voltage, current, charge, and flux in pairs. In 1971, Leon Chua proved mathematically that a fourth passive element must exist — one linking charge to flux. He called it the memristor. HP Labs built the first confirmed one in 2008.
WHY COILS EXIST
Classical inductance comes from geometry — current flowing through a coil generates a magnetic field that resists changes in current. A 145-kilohenry coil at audio frequencies would weigh kilograms and span meters. Geometry is the constraint chip designers cannot escape.
EMERGENT, NOT MAGNETIC
The molecule generates no magnetic field. Its inductance is emergent — pinched-hysteresis dynamics make current lag voltage in the same mathematical way a coil does. The behavior is inductive even though the physics is not.
WHY BRAINS CARE
A biological synapse strengthens when it fires repeatedly. A memristor strengthens when current flows repeatedly. Adding emergent inductance into the same device means a single molecule can store memory and shape signal dynamics — the two operations a neuron actually performs.
THE GENERALIZATION
The paper's deeper claim: any device with pinched hysteresis — the signature loop that defines memristors — exhibits emergent inductance and capacitance under the right drive. If true, every memristor ever built is also a hidden inductor, and chip designers gain a passive component library they never knew existed.