Evidence of Ferromagnetism and Ultrafast Dynamics of Demagnetization in an Epitaxial FeCl2 Monolayer

• DOI: 10.1021/acsnano.4c01436
• Publication Date: 2024-04-13T13:30:19Z
• Authors: Xuhan Zhou; Tianran Jiang; Ye Tao; Yi Ji; Jingying Wang; Tianshu Lai; Dingyong Zhong
• Keywords: Magnetism; Magnetization dynamics

The development of two-dimensional (2D) magnetism is driven not only by the interest low-dimensional physics but also potential applications in high-density miniaturized spintronic devices. However, 2D materials possessing a ferromagnetic order with relatively high Curie temperature (Tc) are rare. In this paper, evidence ferromagnetism monolayer FeCl2 on Au(111) surfaces, as well interlayer antiferromagnetic coupling bilayer FeCl2, characterized using spin-polarized scanning tunneling microscopy. A ∼147 K revealed for based our static magneto-optical Kerr effect measurements. Furthermore, temperature-dependent magnetization dynamics investigated time-resolved effect. transition from one- to two-step demagnetization occurs lattice approaches Tc, which supports Elliott–Yafet spin relaxation mechanism. findings contribute deeper understanding underlying mechanisms governing ultrafast materials.