A new holographic method utilizing the time-reversal operation of an electron beam has been devised to observe separately electric and magnetic phase distributions as interference electron micrographs, which had been unavailable using conventional methods. By this technique, both the magnetization and thickness distributions of three-dimensional cobalt particles have been determined.

Holographic interference electron microscopy is presented for investigating the structure of domain walls in plate-shaped cobalt particles. Circular magnetic lines of force are directly observed as contour fringes which overlap individual particle micrographs. These fringes show at a glance how the spin rotates across domain walls. It is also suggested from holographic electron diffraction that the spin stands up in the center of the particle.

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