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"What happens when you hit a magnetic domain with very short pulses of laser light?"

To lower the energy of the system, one of the moments must be switched, or a new magnetic domain must be generated.

The odd thing is that the heat pulse has no direction to tell a tiny magnetic domain which way to point.

One possibility is to heat up the magnetic domain while applying the magnetic field, making the bit easier to flip.

So long as electricity was studied in its condition at rest on charged conductors, as in the old science of electrostatics or frictional electricity, it possessed no magnetic properties whatever, nor did it encroach on the magnetic domain: only vague similarities in the phenomena of attraction and repulsion aroused attention.