Magnetic Anisotropy, Magnetostriction, and Magnetic Domain Walls in NiO. II. Experiment

Abstract

The so-called p-band patterns, i. e., fine lamellar patterns observable within a single T-domain of NiO under a polarizing microscope, have been confirmed, with the use of X-ray techniques, to come from the magnetic domain structure due to the existence of S-walls, whose crystallographic aspects are just as predicted in the preceding paper. From observed behaviours of S-domains in applied magnetic fields, the easy directions of magnetization within the easy plane (111) are determined to be (Remark: Graphics omitted.), but not (Remark: Graphics omitted.). By observing the domain structures with Berg-Barrett method, the magnitude of spontaneous magnetostriction is obtained as |e_x′x′−e_y′y′|=(9±3)×10⁻⁵ and e_z′x′⁄(e_x′x′−e_y′y′)=−0.18±0.06, where the x′-axis is taken along the spin axis, and the z′-axis along [111].