Abstract
Tunable periodic ferroelastic domain wall gratings in neodymium pentaphosphate (NPP) are presented. These arrays have excellent diffraction patterns and may be tuned from periods of 100 microns to 0.5 microns. A free energy theory is presented which predicts the stability of the periodic arrays and their eventual collapse at very short periods. Photographs of ferroelastic bubbles are shown. These elastic bubbles are a newly-discovered domain structure and are the analog to ferromagnetic bubbles. A method of optically nucleating planar domain walls in NPP is presented. This technique may eventually lead to an optical ferroelastic domain wall memory.
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