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Magnetic domain states of completely isolated particles of barium ferrite between 0.1 and 2 μm in size are investigated by electron holography. Phase distribution is reconstructed digitally by the Fourier transform method and converted to interference micrographs. In the interference micrographs single magnetic‐domain particles are observed directly and clearly for the first time. Furthermore, it is found that single‐domain and two‐domain particles coexist down to sizes as small as about 0.1 μm.