Strain-induced structural, magnetic and ferroelectric properties of heterostructure BST–NZFO nanocomposite thin film at room temperature

Abstract

Heterostructure Ba 0.7 Sr 0.3 TiO 3-Ni 0.8 Zn 0.2 Fe 2 O 4 composite thin films grown on Pt-TiO 2-SiO 2-Si substrate were prepared by chemical solution process, where Ba 0.7 Sr 0.3 TiO 3 layer grew as top/bottom while Ni 0.8 Zn 0.2 Fe 2 O 4 layer grew as bottom/top. Structural characterization by X-ray diffraction and atomic force microscopy showed the similar crystal structure, different lattice parameters, large lattice strain and small grain size in heterostructures, whatever their deposition sequences. Such heterostructures present simultaneously ferromagnetic and ferroelectric responses at room temperature. In particular, an exceptionally large saturation magnetization was observed in one heterostructures film. The growth sequences of Ba 0.7 Sr 0.3 TiO 3 and Ni 0.8 Zn 0.2 Fe 2 O 4 layers on the substrate remarkably affect the magnetic properties of the composite thin films at room temperature.

Structural, optical, and magnetic study of Ni-doped TiO2 nanoparticles synthesized by sol–gel method

“…This lattice strain related to small nanoparticles caused displacement of atoms which produced structure deformation as atoms present on the surface produce surface effect by variation in position of cations and anions that support development in magnetic behavior. The influence of strain on magnetic behavior in the current work also has correlation with strain-induced magnetic behavior reported previously by many authors [47][48][49][50]. Upon doping, M s increased and this trend reverses with higher amount of doping well matched with the literatures [51,52].…”

[Retracted] Application and Equipment of Preparation Technology of Ferroelectric Thin Film Materials in Sports Industry

“…Since Schmid defined multiferroic materials in 1994 [4,5] (referring to a class of materials with more than one ferroelectric sequence parameter for single-phase materials), the definition of multiferroic materials has been continuously broadened. At present, it is considered that the four basic order parameters of multiferroic materials are electric dipole moment, magnetic moment, elastic moment, and spin pole moment [6] (see Figure 1). That is to say, a multiferroic material is a material that has two or more basic ferroelectric characteristics (including ferroelectricity, antiferroelectricity, ferromagnetism, antiferromagnetism, and ferroelasticity).…”