The magnetic domain structures and microstructures of ferrimagnets, A2FeMoO6 (A = Ba or Ca), having a double perovskite-type structure were studied by means of Lorentz transmission electron microscopy and dark-field imaging techniques. The magnetization distribution was obtained using the transport-of-intensity equation method based on Lorentz transmission electron microscopy images. In Ba2FeMoO6 single crystals, the magnetic domain walls were pinned at antiphase boundaries, due to Fe/Mo antisites while, in Ca2FeMoO6 polycrystalline samples, the magnetic domain walls were pinned at grain boundaries. These results indicated that underlying crystal defects, such as antiphase and grain boundaries, affected the local magnetization distribution.

Pinning Effect of the Antiphase and Grain Boundaries on Magnetic Domains in Double Perovskite A2FeMoO6. X.Z.Yu, T.Asaka, Y.Tomioka, Y.Kaneko, M.Uchida, J.P.He, T.Nagai, K.Kimoto, Y.Matsui, Y.Tokura: Journal of Magnetism and Magnetic Materials, 2007, 310[2], 1572-4