Sharif Digital Repository

Electrical and magnetic thin films have attracted many researchers’ attentions in random access memories, sensors, actuators and Nano electronic systems industries in recent years. Recent tendencies on decreasing the dimensions of the electronic equipment generate important investigations on coupling the electrical and magnetic properties. In this way multiferroic material as it has these two properties and has a significant between other similar materials, attracted much attention of researchers. So in this research at the first step, it has proceeded to make a multiferroc composite with depositing of barium titanate and strontium hegzaferrite by pulsed laser depositions and for decreasing... 

In this thesis, by deliberately embedding “emplacements” in the system to locally break the inversion and the time reversal symmetries, the manifold of all possible microstructures is navigated in pursuit of the one that can give rise to maximal magnetoelectric effect mediated by elastic energy of piezoelectric-piezomagnetic phases via their interface --- needless to mention the low intensity of such an effect in single-phase multiferroics. The configuration with the maximal coupling is sought within the context of phase-field modeling. In order to numerically track the conserved dissipative dynamics of the interface (namely, the Cahn-Hilliard equation) --- that is nonlocal by the nature of...