How quickly the magnetic field collapses after the pulse ends. This affects the strength of the second induction event in tissue as the collapsing field generates a reverse electric field. Measured as the 90%-to-10% transition time of the magnetic field pulse, typically captured with an oscilloscope.
One pulse over time. The field climbs from rest to its peak, holds, then falls back. How fast that rising edge climbs is the slew rate, and a steeper edge drives a stronger stimulus. The rise time and fall time are measured between the 10% and 90% levels; the pulse width is measured at half the peak.