1. Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, Romania
2. Department of Exact & Natural Sciences, Institute of Interdisciplinary Research, Al. I. Cuza University of Iasi, Bv. Carol I, No. 11, 700506Iasi, Romania
3. National Institute of R&D for Technical Physics, 700050Iasi, Romania
4. National Institute of Materials Physics, Atomistilor 405A, 077125Magurele, Romania
5. Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan Cel Mare University, 720229Suceava, Romania