A direct transfer of angular momentum from a circularly polarized light to spins allows to excite a magnet from its equilibrium state at sub-picosecond time scales. The discovery, allowing to manipulate spins in a magnet by short laser pulses, was reported by scientists from the joint Laboratory of Opto-Spintronics at the Faculty of Mathematics and Physics, Charles University and the Institute of Physics, Academy of Sciences of the Czech Republic.
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