Lorentz TEM and LM-STEM DPC Analysis of Magnetic Domains in Soft Ferromagnets

Abstract

Magnetic microstructure in the as suction cast Fe 69 B 20 Nb 2 Hf 2 Si 2 Y 5 alloy was revealed by combined Lorentz-TEM and LM-STEM DPC analysis. The thin foil of the alloy was found to be composed primarily of the amorphous phase with few dendritic structures. Magnetic domains were found large in the µm range with an average domain wall width of 52 nm. The magnetic domain boundaries are easily mobile, what was confirmed by in situ applied magnetic field. The LM-STEM DPC complements the Lorentz-TEM analysis by providing details on the intensity and spatial distribution of the magnetization vector within the domains.