2014/04/30 by O. G. Udalov, N. M. Chtchelkatchev, I. S. Beloborodov
Materials Science · Physics and Astronomy · #Condensed matter physics #Curie temperature #Dielectric #Electric field #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetism #Magnetization #Materials science #Multiferroics #Multiferroics and related materials #Optoelectronics #Phase transition #Physics #Polarization density #cond-mat.dis-nn #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/27/18/186001
published as J. Phys.: Condens. Matter 27 186001 (2015) · 22 pages 11 figures
openalex publication_date 2015/04/20 · arxiv created 2015/05/21 · arxiv updated 2015/06/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study magnetic state and electron transport properties of composite multiferroic system consisting of a granular ferromagnetic thin film placed above the ferroelectric substrate. Ferroelectricity and magnetism in this case are coupled by the long-range Coulomb interaction. We show that magnetic state and magneto-transport strongly depend on temperature, external electric field and electric polarization of the substrate. Ferromagnetic order exists at finite temperature range around ferroelectric Curie point. Outside the region the film is in the superparamagnetic state. We demonstrate that magnetic phase transition can be driven by an electric field and magneto-resistance effect has two maxima associated with two magnetic phase transitions appearing in the vicinity of the ferroelectric phase transition. We show that positions of these maxima can be shifted by the external electric field and that the magnitude of the magneto-resistance effect depends on the mutual orientation of external electric field and polarization of the substrate.