Abstract
Dynamic behavior of magnetic domains in a thin permalloy film has been observed by on-line real-time electron holography. Electron holograms formed in a transmission electron microscope equipped with an electron biprism are detected by a TV camera and transferred to a liquid-crystal spatial light modulator (LC-SLM) located at the output port of a Mach-Zehnder interferometer. Interference micrographs, where magnetic flux lines are directly visualized, are obtained by superimposing a plane wave onto an object wave reconstructed from the hologram in the LC-SLM. Using this system, dynamic behavior of magnetic domains in the magnetization or demagnetization processes is clearly observed.
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