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RESEARCH PRODUCT
True Nanoferroics with the Properties Absent in Corresponding Bulk Samples
Vladimir A. StephanovichA. V. RagulyaMaya D. Glinchuksubject
Phase transition temperatureMaterials scienceCondensed matter physicsFerromagnetismBulk samplesDielectric permittivityNanoparticleFerroicsDielectricThin filmdescription
The Chapter covers the theoretical and experimental approaches to the investigations of the physical properties, which are inherent in ferroics of nanosize and absent in corresponding bulk materials. Namely, the strong surface influence along with other effects of geometrical confinement generates number of physical effects, which do not occur in bulk ferroics samples. One example of such phenomena is room-temperature ferromagnetism in nanoparticles and thin films of undoped CeO2, HfO2, SnO2, Al2O3 and other nonmagnetic (in bulk samples) oxides. Theo other striking example is appearance of so-called spontaneous flexoeffects (i.e. flexoelectric, flexomagnetic, flexoelastic) in ferroic nanosamples due to strong gradient terms generated by the effects of geometrical confinement. We predict strong altering of phase transition temperature, magnetic and/or dielectric susceptibilities, piezomoduli and other physical properties of nanoferroics by the above spontaneous flexoeffects. Latter permits to describe many previously unclear experimental results.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-01-01 |