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Twisted light affects ultrafast demagnetization
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Irradiation with an ultrashort laser pulse can completely destroy the magnetic order of ferromagnetic thin films on the femtosecond timescale. This phenomenon holds great potential for ultrafast spintronics and information processing and is an active field of research. It is still an open question if the angular momentum of light can support this effect. While it has been shown that the spin of light only has a negligible influence, we experimentally demonstrate the influence of ultrashort laser pulses with orbital angular momentum (OAM) on the magnetization dynamics of a thin nickel film. Our results reveal that the photonic OAM affects the demagnetization behavior within the first hundreds of femtoseconds depending on the handedness of the OAM with respect to the direction of the sample magnetization.
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Cited by 1 Pith paper
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Light-induced Orbital and Spin Magnetism in $3d$, $4d$, and $5d$ Transition Metals
Light-induced orbital magnetism dominates the spin response in most non-magnetic transition metals, and the full periodic trend is mapped from first principles.
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