Generating spin currents directly using a linearly polarized ultrashort laser pulse and a circularly polarized probe laser

https://phys.org/news/2024-09-generating-currents-ultrashort-laser-pulses.html

"generate electrons with same orientation, no longer mixed that required filtering...  20 alternating layered platinum/ cobalt target block, each layer 1 nm thick, placed in vessel, directing magnetic field at it from bottom to top, strong enough to align electron spins in both layered materials... fired short pulsed polarized laser, and circularly polarized probe laser, shifting electron spins between layers within few fs, changing magnetic ordering, altering degree of magnetism... faster, more efficient, energy saving electronic devices"