Interplay of heating and helicity in all-optical magnetization switching
Interplay of heating and helicity in all-optical magnetization switching
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DOI：
10.1103/physrevb.85.092401
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发表时间：
2012-03-19
影响因子：
3.7
通讯作者：
Aeschlimann, Martin
中科院分区：
文献类型：
--
作者：
Alebrand, Sabine;Hassdenteufel, Alexander;Aeschlimann, Martin
关于激光加热和光子螺旋性在全光开关中所起的作用，人们提出了对比假设。在这里，我们提出了一个区分加热驱动效应和螺旋驱动效应的实验。我们表明，即使切换需要最少量的循环，加热也有助于该过程。此外，我们表明，激发激光脉冲携带的螺旋度信息在较低温度下更容易转移到磁性材料中，并且在光激发后它在 GdFeCo 中持续至少一些皮秒。
Contrasting hypotheses have been made about the role played by laser heating and photon helicity in all-optical switching. Here we present an experiment that distinguishes between heating- and helicity-driven effects. We show that even though a minimum amount of circularity is needed to switch, heating contributes to the process. Moreover, we show that the helicity information carried by the exciting laser pulses is more easily transferred into the magnetic material at lower temperatures and that it persists in GdFeCo for at least some picoseconds after optical excitation.