The circuit is connected as drawn below:
MOSFET IC = MAX14919A
Valve actuator = MHE2-MS1H-3/2G-M7-K
Schottky Diode = SS16HL-TP
The pulse happens when the low-side MOSFET opens (disconnecting the valve actuator from ground) before slowly increasing to 24V from 0V.
The yellow line represents the MOSFET gate input signal (5V = on, 0V = off)
The green line represents the applied output voltage (24V)
The waveforms are shown below:
I believe this phenomenon is not an inductive spike because if it was, the Schottky diode would have minimised or eliminate the spike. I have tried the same setup with two other MOSFET ICs, BTS3410G and Si83014BF‐IT. Both of these MOSFET are slower than the MAX14919A (with the BTS3410G being the slowest) and both of them show this pulse once the MOSFET is open.