All-optical magnetic recording with circularly polarized light
All-optical magnetic recording with circularly polarized light
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DOI：
10.1103/physrevlett.99.047601
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发表时间：
2007-07-27
影响因子：
8.6
通讯作者：
Rasing, Th.
中科院分区：
文献类型：
--
作者：
Stanciu, C. D.;Hansteen, F.;Rasing, Th.
我们的实验表明，磁化可以在一个可再现的方式由一个单一的40飞秒圆偏振激光脉冲，没有任何外加磁场逆转。这种光学诱导的超快磁化反转以前被认为是不可能的，是飞秒激光将磁性系统加热到居里点以下和圆偏振光同时充当磁场的综合结果。这种光磁转换的方向只由光的螺旋度决定。这一发现揭示了一种以破纪录的速度写入磁性比特的超快和有效的途径。
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.