I'm designing a pcb relay circuit to switch on/off power to an inductive load on a 12V line. I'm using an SPST-NO relay (omron relay) to switch the circuit open and closed, and I'm having trouble tracking down a high-frequency (~10MHz) +5V voltage spike seen when the switch closes. Any advice on how to clean up the initial power on signal? Oscilloscope attached, note the voltage divisions are 5V and the time divisions are at 500ns.
I've tried connecting a TVS diode in parallel with the inductive load with no success. Happy to include a schematic if it's useful. Any advice would be much appreciated.