Khist V. Phase transitions induced by nanomaterials sizes, magnetic and ferroelectric properties that are absent in bulk materials

In this paper we performed a comprehensive theoretical study of the phase diagram of nanomaterials, namely films , nanoparticles of different geometric shapes , and the calculation of magnetic and ferroelectric properties absent in bulk materials. It was first developed the theory of the magnetic properties emergence in thin films of non-magnetic binary oxides. A comparison between theory and experiment is performed and it is shown that the theory describes quite well the experiment in SnO2 films. The dependence of the magnetization versus temperature is obtained for various film-substrate mismatch. The interaction between antiferrodistorsive structural order parameter (rotations of the oxygen octahedra), polarization and magnetization in nanotubes and nanowires of solid solutions EuxSr1-xTiO3 is studied. It was first calculated the phase diagram of nanotubes and nanowires EuxSr1-xTiO3. It is shown that the phase diagrams include antiferrodistorsive, ferromagnetic and antiferromagnetic phases. The flexomagnetic effect of macro-and ferroelectric nanostructures - ferromagnetic, ferroelectric - antiferromagnet is analytically studied within the framework of the phenomenological approach. The possibility of a new linear flexomagnetoelectric (PME) coupling in bulk and nanoscale materials with the flexomagnetic effect is demonstrated.