Presentation Information
[15p-PB1-20]Scanning transmission electron microscope observation for L10-FePd epitaxial films grown by a two-step heating method
Samuel Vergara1,2, Hanuma Kumar Dara3, Amit Kohn3, 〇Hiroshi Naganuma4 (1.ENS Paris, 2.Lab. Albert Fert, 3.Tel Aviv Univ., 4.Nagoya Univ.)
Keywords:
L10-FePd,STEM,Two step heating
A STEM study was conducted on 5-nm-thick L10-FePd epitaxial films grown on SrTiO3 (001) substrates using a two-step heating method. Although all films were annealed at 600°C, a small 50 K difference in the first-step heating temperature caused a drastic change in film morphology. Films grown at 150°C form a continuous, uniform layer with an atomically flat surface, as confirmed by cross-sectional HAADF-STEM images showing constant thickness and coherent epitaxial growth. In contrast, films grown at 200°C exhibit pronounced solid-state dewetting, resulting in square-shaped holes penetrating to the substrate and large local thickness variations. These results demonstrate that a subtle change in the first-step heating temperature critically determines the continuity of ultrathin L10-FePd films, emphasizing the importance of early-stage thermal conditions for spintronic applications.