Magnetic domain-wall width in La0.7Ca0.3MnO3 thin films measured using Fresnel imaging -: art. no. 172407

Magnetic domain walls in ferromagnetic La0.7Ca0.3MnO3 films T(C)similar to 260 K) have been studied in the transmission electron microscope. Epitaxial films grown on SrTiO3 and NdGaO3 substrates were prepared using a focused ion beam microscope to create electron transparent areas. Energy filtered domain-wall images taken at 100 K as a function of defocus were used to determine the width of a 180 degrees domain wall. A linear extrapolation of the inferred angular dependence of moment on position, from the wall center to +/-90 degrees, gives a wall width of 38 +/- 10 nm in agreement with theoretical predictions.