Transmission Electron Microscope Observations of Magnetic Domain Walls

Abstract

Ferromagnetic domain wall images have been observed in a variety of ferromagnetic materials by an electron transmission technique employing defocusing of the objective lens. Image formation and contrast effects are interpreted on the basis of charged particle motion through a magnetic field and electron microscope imaging. Observations are consistent with magnetic domain theory; domain sizes and wall geometry have been confirmed by the Bitter pattern technique.