Magnetoelectric coupling of multiferroic chromium doped barium titanate thin film probed by magneto-impedance spectroscopy

Abstract

Thin film of BaTiO3 doped with 0.1 at. % Cr (Cr:BTO) has been prepared by pulsed laser deposition technique. Film was deposited on Pt/SrTiO3 substrate at 500 °C in 50 mTorr Oxygen gas pressure using KrF (298 nm) laser. Polycrystalline growth of single phase Cr:BTO thin film has been confirmed by grazing angle X-ray diffraction. Cr:BTO film exhibited remnant polarization 6.4 μC/cm2 and 0.79 MV/cm coercivity. Magnetization measurement of Cr:BTO film showed magnetic moment 12 emu/cc. Formation of weakly magnetic domains has been captured by magnetic force microscopy. Theoretical impedance equation fitted to experimental data in Cole-Cole plot for thin film in presence of transverse magnetic field resolved the increase in grain capacitance from 4.58 × 10−12 to 5.4 × 10−11 F. Film exhibited high value 137 mV/cm-Oe magneto-electric (ME) coupling coefficient at room temperature. The high value of ME coupling obtained can reduce the typical processing steps involved in multilayer deposition to obtain multiferrocity in thin film. Barium titanate being best ferroelectric material has been tailored to be multiferroic by non ferromagnetic element, Cr, doping in thin film form opens an avenue for more stable and reliable spintronic material for low power magnetoelectric random excess memory applications.

Interfacial Charge Induced Magnetoelectric Coupling at BiFeO3/BaTiO3 Bilayer Interface

“…Multiferroic materials are of significant interest in scientific as well as technological requirements due to the possibility of controlling magnetism through electric field. , The interplay between magnetic and ferroelectric order parameters offers various applications in novel spintronics and magnetoelectric devices with fast speed and low power consumption. , The artificial multiferroic heterostructure in the form of multilayer, − superlattice, and vertically aligned nanopillars has been extensively studied due to their ability to provide new physical insights responsible for induced magnetoelectric (ME) coupling. − Multiferroic bilayer thin films have been subjected to a wide range of focus due to their interesting magnetoelectric properties. Significantly improved electric as well as magnetic properties can be tailored by appropriate combination of constituent layers.…”

Prediction of giant magnetoelectric effect in LaMnO3/BaTiO3/SrMnO3 superlattice: The role of n-type SrMnO3/LaMnO3 interface

“…33 Besides, the notorious "dead-layer" problem in ultrathin La 1Àx Sr x MnO 3 layer [36][37][38][39] is also likely to hinder the ferroelectric control of magnetization in short-period superlattice composed of FM La 1Àx Sr x MnO 3 and ferroelectric. In view of these results, the superlattice structure we present probably have some advantages over other multiferroic composites 15,33,[39][40][41] for the use of ferroelectrics in the electric modulation of magnetization.…”

Magnetoelectric dipole interaction in RF-magnetron sputtered (1−x) BiFeO3–xBaTiO3 thin films

“…ME coupling offers various possibilities of multiferroic thin films in device applications via electric field control of magnetization and vice versa [4]. In quest of room temperature new multiferroic materials, increasing interest has led to exploring coupling between magnetic and electric field [5][6][7][8][9][10][11][12]. Magnetoelectric coupling coefficient value is usually small in single-phase multiferroics as they often exhibit only weak magnetization or ferroelectricity.…”