Fig. 2: Growth, structure, and magnetic properties of Fe-rich Fe1.2Ge.
From: An atomically tailored chiral magnet with small skyrmions at room temperature
a Reflection high energy electron diffraction (RHEED) patterns for conventional FeGe co-deposited at 300 °C, Fe1.2Ge co-deposited at 300 °C, and FeGe and Fe1.2Ge grown by atomic layer molecular beam epitaxy (ALMBE) at room temperature. b θ–2θ X-ray diffraction scans for co-deposited FeGe (blue curve), co-deposited Fe1.2Ge (green curve), and ALMBE Fe1.2Ge (red curve) show the presence of secondary phases (black arrows) for co-deposited Fe1.2Ge but not for ALMBE Fe1.2Ge. Inset: A close-up of the B20 FeGe peak for normal co-deposited FeGe (blue curve) and ALMBE Fe1.2Ge (red curve) indicates an expansion of the B20 lattice due to the incorporation of excess Fe. c Cross-sectional high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) image of Fe1.2Ge on FeGe/Si(111) showing the B20 lattice. d X-ray energy dispersive spectroscopy (XEDS) scan showing a higher Fe:Ge ratio in the Fe1.2Ge film. e Magnetization as a function of temperature with the out-of-plane field of 2 Tesla for FeGe (blue curve) and Fe-rich Fe1.2Ge (red curve).
