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RESEARCH PRODUCT

Theoretical Description of Primary Nanoferroics. Comparison of the Theory with Experiment

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This Chapter is devoted primarily to the theoretical description of the physical properties of nanoferroics. The theoretical approach that has been successful in describing the size- and shape-dependent effects observed experimentally in nanoferroics is Landau – Ginzburg – Devonshire phenomenological theory, operating on nanoferroics symmetry and order parameters. Our analysis of this theory applicability shows that it can be safely applied down to the sample sizes of few nanometers. The main peculiarity of theoretical description of nanoferroics is that the boundary conditions and terms containing gradients of order parameters cannot be omitted and play the vital role in the description of their physical properties. The phenomenological approach can be successfully applied for the description of primary, secondary and higher orders nanoferroics. We present the comprehensive comparison of the available theoretical approaches and experimental results.