Hassdenteufel Alexander, Schubert Christian, Hebler Birgit, Schultheiss Helmut, Fassbender Jürgen, Albrecht Manfred, Bratschitsch Rudolf
Opt Express. 2014 Apr 21;22(8):10017-25. doi: 10.1364/OE.22.010017.
We demonstrate all-optical magnetic switching (AOS) in an amorphous Tb30Fe70 thin film, triggered by a 5.1 MHz laser oscillator. The magnetic layer is grown on SiO2/Si substrate. An identical magnetic film deposited on a microscope glass slide reveals no AOS but solely thermally induced demagnetization. This effect is due to heat accumulation by multiple laser pulses because of the low thermal conductivity of the glass substrate. In contrast, the use of a proper heat sink (e.g. SiO2/Si) avoids the need for low repetitive laser amplifier systems to induce AOS and paves the way for a cheap and simple technical implementation using conventional laser oscillators.
我们在非晶Tb30Fe70薄膜中演示了由5.1 MHz激光振荡器触发的全光磁开关（AOS）。磁性层生长在SiO2/Si衬底上。沉积在显微镜载玻片上的相同磁性薄膜未显示出AOS，仅表现出热致退磁。这种效应是由于玻璃衬底的低导热率导致多个激光脉冲积累热量所致。相比之下，使用合适的散热器（如SiO2/Si）避免了需要低重复频率的激光放大器系统来诱导AOS，并为使用传统激光振荡器的廉价且简单的技术实现铺平了道路。
