飞秒
圆极化
超短脉冲
磁化
磁场
激光器
螺旋度
光学
物理
凝聚态物理
材料科学
粒子物理学
量子力学
作者
C.D. Stanciu,Fredrik Hansteen,A.V. Kimel,Andrei Kirilyuk,Arata Tsukamoto,A. Itoh,T.H.M. Rasing
标识
DOI:10.1103/physrevlett.99.047601
摘要
We experimentally demonstrate that the magnetization can be reversed in a reproducible manner by a single 40 femtosecond circularly polarized laser pulse, without any applied magnetic field. This optically induced ultrafast magnetization reversal previously believed impossible is the combined result of femtosecond laser heating of the magnetic system to just below the Curie point and circularly polarized light simultaneously acting as a magnetic field. The direction of this opto-magnetic switching is determined only by the helicity of light. This finding reveals an ultrafast and efficient pathway for writing magnetic bits at record-breaking speeds.
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