## Abstract

Electron microscopic evidence is obtained for the presence of a domain structure in anti-ferromagnetic cobalteous oxide. The domain boundaries tend to adopt [101] orientations; they are visible as fringe patterns when lying in planes inclined to the foil plane. When the domain boundary is observed edge-on, adjacent domains differ in brightness.

Combining earlier neutron diffraction data with the present observations it is concluded that the spin direction, which is roughly parallel to the tetragonal c-axis, has to turn through 90° across a domain wall. The proposed models for the domain walls are verified by means of contrast theory and their geometry checked by the u.se of Kikuchi lines.

The contrast effects observed for some particular configurations of domain walls are compared with numerical calculations based on the dynamic theory of electron diffraction,taking into account anomalous absorption.

Combining earlier neutron diffraction data with the present observations it is concluded that the spin direction, which is roughly parallel to the tetragonal c-axis, has to turn through 90° across a domain wall. The proposed models for the domain walls are verified by means of contrast theory and their geometry checked by the u.se of Kikuchi lines.

The contrast effects observed for some particular configurations of domain walls are compared with numerical calculations based on the dynamic theory of electron diffraction,taking into account anomalous absorption.

Original language | English |
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Publisher | SCK CEN |

Number of pages | 18 |

State | Published - Aug 1964 |

### Publication series

Name | SCK CEN Reports |
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Publisher | SCK CEN |

No. | BLG-303 |