论文标题
扭曲的光线会影响超快速反弹
Twisted light affects ultrafast demagnetization
论文作者
论文摘要
用超短激光脉冲的辐射可以完全破坏飞秒时间尺度上铁磁薄膜的磁性。这种现象具有超快速旋转和信息处理的巨大潜力，并且是一个积极的研究领域。如果光的角动量能够支持这种效果，那仍然是一个悬而未决的问题。虽然已经表明，光的旋转仅具有可忽略的影响，但我们在实验上证明了具有轨道角动量（OAM）对薄镍膜的磁化动力学的超短激光脉冲的影响。我们的结果表明，光子OAM会影响前数百人秒内的灭绝行为，具体取决于OAM相对于样品磁化方向的触角。
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.
