Stripe domain

In addition, and most importantly, samples of typical B2 materials always seem to exhibit minority domains which behave quite differently from the stripe domains. Specifically, at zero field these minority domains have the lower An green birefringence color and show a smooth SmA-like focal conic... 

Fig. 29. Schematic diagrams showing (a) hexagonal and (b) striped domain wall arrangements (only superlight walls are drawn on a triangular lattice (e.g. the (111) face of f.c.c. metals)). In incommensurate layers, where the monolayer is compressed with respect to the commensurate lattice, domain walls or either heavy or superheavy (c).

The analysis in the last paragraph has shown that the incommensurate Xe layer on Pt(lll) at misfits of about 6% is a striped phase with fully relaxed domain walls, i.e. a uniaxially compressed layer. For only partially relaxed domain walls and depending on the extent of the wall relaxation and on the nature of the walls (light, heavy or superheavy) additional statellites in the (n, n) diffraction patterns should appear. Indeed, closer to the beginning of the C-I transition, i.e. in the case of a weakly incommensurate layer (misfits below 4%) we observe an additional on-axis peak at Qcimm + e/2 in the (2,2) diffraction pattern. In order to determine the nature of the domain walls we have calculated the structure factor for the different domain wall types as a function of the domain wall relaxation following the analysis of Stephens et al. The observed additional on-axis satellite is consistent with the occurrence of superheavy striped domain wails the observed peak intensities indicate a domain wall width of A=i3-5Xe inter-row distances. With... 

Fig. 8 Illustration of a gradient micropattem library. The central band of the library exhibits a micropattem that gradually changes the chemical differences between the striped domains and the matrix until the surface is chemically homogeneous. The bands on the top and bottom of the library are the calibration fields for static matrix and gradient respectively. 7 is surface energy...

In the presence of weak disorder the free energy density of this stripe domain state is given by... 

Streiffer SK, Eastman JA, Fong DD, Thompson C, Munkhohn A, Ramana Murty MV, Auciello O, Bai GR, Stephenson GB (2002) Observation of nanoscale 180° stripe domains in ferroelectric PbTi03 thin films. Phys Rev Lett 89 067601... 

Figure 38. Striped domain wall in a model of uniaxially compressed N2 monolayers on graphite (a) observed in Monte Carlo simulations of 52 X 12 molecules at 10 K and a coverage of 1.026 monolayers. Dots denote the centers of the honeycomb hexagons of the graphite basal plane, and crosses mark the mean positions of the molecular centers of mass. The inset of (a) shows the herringbone order in the commensurate region at the left and right boundaries of (a). The center-of-mass distribution in the region of the domain wall of (a) sampled from the Monte Carlo trajectory is magnified in (b). (Adapted from Fig. 1 of Ref. 283.)...

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