非晶态$_x$ Co $_{100-x}$合金的磁开关和全光开关特性
Magnetic and all-optical switching properties of amorphous Tb$_x$Co$_{100-x}$ alloys
摘要：
非晶$_{x}$ Co $_{100-x}$磁性合金具有垂直磁各向异性、高磁光活性和超短光脉冲磁化翻转等一系列有趣的性质。改变这些合金中的Tb：Co比率允许调谐特性，诸如饱和磁矩、矫顽场和光诱导磁化切换的性能。在这项工作中，我们研究了各种Tb $_{x}$ Co $_{100-x}$薄膜合金组合物的磁性，光学和磁光性能。我们报告的效果不同的种子层的选择上的结构和磁性的Tb $_{x}$ Co $_{100-x}$层。我们还表明，对于一系列的合金，沉积在熔融石英基板上，与Tb含量为24-30原子。$\%$，可以实现依赖于螺旋度的磁化全光切换，尽管是在多激发框架中。我们解释了这种性质产生的螺旋度相关的激光诱导磁化Co子晶格由于逆法拉第效应。我们的研究为未来潜在的混合磁等离子体TbCo基架构的材料方面提供了深入了解。
英文摘要：
Amorphous Tb$_{x}$Co$_{100-x}$ magnetic alloys exhibit a list of intriguing properties, such as perpendicular magnetic anisotropy, high magneto-optical activity and magnetization switching using ultrashort optical pulses. Varying the Tb:Co ratio in these alloys allows for tuning properties such as the saturation magnetic moment, coercive field and the performance of the light-induced magnetization switching. In this work, we investigate the magnetic, optical and magneto-optical properties of various Tb$_{x}$Co$_{100-x}$ thin film alloy compositions. We report on the effect the choice of different seeding layers has on the structural and magnetic properties of Tb$_{x}$Co$_{100-x}$ layers. We also demonstrate that for a range of alloys, deposited on fused silica substrates, with Tb content of 24-30 at.$\%$, helicity dependent all-optical switching of magnetization can be achieved, albeit in a multi-shot framework. We explain this property to arise from the helicity-dependent laser induced magnetization on the Co sublattice due to the inverse Faraday effect. Our study provides an insight into material aspects for future potential hybrid magneto-plasmonic TbCo-based architectures.
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