Femtotesla magnetometry

Femtotesla magnetometry is a highly sensitive technique used to measure extremely tiny magnetic fields—one quadrillionth (10⁻¹⁵) of a Tesla, which is a standard magnetic unit. Using advanced sensors like atomic vapor cells or quantum devices, femtotesla magnetometers can detect weak magnetic signals from natural sources like brain activity, volcanic activity, or geological formations. This technology allows scientists to study subtle magnetic phenomena with precision, opening new possibilities in medical diagnostics, environmental research, and fundamental physics, by revealing magnetic variations that are otherwise nearly impossible to detect.