Vertically aligned nanocomposite (BaTiO₃)_0.8 : (La_0.7Sr_0.3MnO₃)_0.2 thin films with anisotropic multifunctionalities

Abstract

<p>A new vertically aligned nanocomposite BaTiO₃(BTO):La_0.7Sr_0.3MnO₃(LSMO) was synthesized using a one-step pulsed laser deposition technique and anisotropic magnetic and optical properties were achieved due to the ultra thin LSMO pillars embedded in BTO matrix microstructure.</p>

Design of 3D Oxide–Metal Hybrid Metamaterial for Tailorable Light–Matter Interactions in Visible and Near‐Infrared Region

“…Furthermore, by properly selecting the metal nanopillar phase and oxide or nitride matrix, other novel functionalities such as tunable ferroelectric, ferromagnetic, and magnetoelectric coupling and thermal stability can also be enabled. [ 37–41 ]…”

Self‐Assembled Metal–Dielectric Hybrid Metamaterials in Vertically Aligned Nanocomposite Form with Tailorable Optical Properties and Coupled Multifunctionalities

“…Currently, most of the explored metal–oxide VAN systems have negative ε metallic nanopillars embedded in a positive ε dielectric matrix, leading to ε || > 0, ε ⊥ < 0 (schematic illustration shown on the bottom right in the diagram), epsilon‐near‐zero (ENZ) and hyperbolic dispersion characteristics. For oxide–oxide VAN films such as BTO–ZnO [ 55 ] and BTO–LSMO, [ 57 ] less anisotropy in ε || and ε ⊥ components are shown due to the small difference between the ε of two oxides phases. The permittivity of one typical metal–nitride Au–TiN [ 58 ] hybrid film is also shown in the plot, where the majority of ε || and ε ⊥ are all negative because of the metallic behaviors of both Au and TiN.…”

“…[47][48][49][50][51][52] The permittivity of common oxides, nitrides, carbides, and several explored VAN hybrid system in the wavelength range of 400-1000 nm are plotted in Figure 2. [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] It can be seen that most of the pure oxides, carbides, and nitrides have isotropic positive permittivity values, i.e., nearly equal positive ε || and ε ⊥ values due to the (pseudo-) centrosymmetric structures. Thus the range of their permittivity values are located in the light-blue elliptical region in the first quadrant of the diagram, with a few exceptions of transition metal nitrides (i.e., TiN, HfN, and ZrN) with both negative ε || and ε ⊥ located in the third quadrant of the diagram.…”

“…IP (ε || ) and OP (ε ⊥ ) permittivity diagram of oxides, nitrides, carbides, and several reported metal-oxide, oxide-oxide VAN systems at wavelength from 400 to 1000 nm. [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] Insets are two schematic illustrations of two types of VAN hybrid films: i) ε || > 0, ε ⊥ < 0 (shown on bottom right) and ii) ε || < 0, ε ⊥ > 0 (shown on top left).…”

“…La 1-x Sr x MnO 3 (LSMO) is a perovskite oxide showing excellent low-field magnetoresistance (LFMR) response which can be fabricated into magnetic tunneling junctions. [57,60,61] Here, LSMO is selected as the oxide matrix to achieve multifunctional Au-LSMO nanocomposite film grown on single-crystal SrTiO 3 (STO) substrate via PLD. [54] The lattice parameter of STO (cubic, a ¼ 3.905 Å) is in between that of Au (cubic, a ¼ 4.072 Å) and LSMO (pseudocubic, a ¼ 3.873 Å), leading to the strain compensation effect and epitaxial growth for the Au-LSMO hybrid film.…”