The combination of Co, Gd, and Pt materials is a representative with perpendicular magnetic anisotropy (PMA) for the all-optical switching (AOS), which provides a promising route for ultrafast magnetization manipulation. This paper shows that the PMA of Co_100−xGd_x/Pt multilayers mainly originates not from the bulk property of ferrimagnetic Co_100−xGd_x but from the interface magnetic anisotropy between the Co_100−xGd_x and Pt layers. In addition, the contribution of magnetic moment induced in Pt becomes remarkable, which modulates the compensation temperature for the samples with thin Co_100−xGd_x layers. The Co_100−xGd_x/Pt multilayers exhibited the all-optical helicity-independent switching in a wide range of Gd concentrations, and the maximum AOS probability was achieved near the compensation composition. We discuss the correlation between the magnetic properties and the AOS probability for the Co_100−xGd_x/Pt multilayers. The AOS showed clear thickness dependence, which was attributable to the remarkable contribution of induced moment. Our findings are beneficial not only for understanding the mechanism of AOS but also for designing spintronic devices using ferrimagnets.

中文翻译：

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Co100−xGdx/Pt 多层膜的磁各向异性起源、感应磁矩的作用和全光磁化转换

Co、Gd 和 Pt 材料的组合是用于全光开关 (AOS) 的具有垂直磁各向异性 (PMA) 的代表，这为超快磁化操作提供了有希望的途径。本文表明，Co _{100- x} Gd _x /Pt 多层膜的 PMA主要不是源于亚铁磁性 Co _{100- x} Gd _x的体特性，而是源于 Co _{100- x} Gd _x和 Pt 层之间的界面磁各向异性。此外，在 Pt 中感应的磁矩的贡献变得显着，这调节了薄 Co _{100− x} Gd _x样品的补偿温度层。Co _{100- x} Gd _x /Pt 多层膜在很宽的 Gd 浓度范围内表现出与全光学螺旋度无关的转换，并且在补偿成分附近实现了最大的 AOS 概率。我们讨论了 Co _{100− x} Gd _x /Pt 多层膜的磁性和 AOS 概率之间的相关性。AOS 显示出明显的厚度依赖性，这归因于诱导力矩的显着贡献。我们的发现不仅有利于理解 AOS 的机制，而且有利于设计使用亚铁磁体的自旋电子器件。