The commensurate La${}_{0.67}$Ca${}_{0.33}$MnO${}_{3}$ films, of which the bulk is a ferromagnetic-metal (FM), can show strikingly different ground states when grown on NdGaO${}_{3}$ substrates various orientations. With larger orthorhombic lattice distortion in substrates, (110) films grow essentially strain-free, but (100) and (001) are anisotropically strained, accompanied by an increased orthorhombicity. As result, while constantly bulklike FM state, others behave dramatically different,...

Transparent and conductive oxide (TCO) films with a cubic perovskite structure, lanthanum-doped strontium stannate La x Sr 1− SnO 3 ( = 0–0.15) (LSSO), have been grown epitaxially on SrTiO (0 0 1) substrates by the pulsed laser deposition method. The doping concentration growth parameters were optimized based high-resolution x-ray diffraction electric transport measurements. We found that optimum level is around 0.07, epitaxial can be at temperatures as low 600 °C in atmospheres compatible...

Ferromagnetic-metallic ground state with high Curie temperature (TC) of 200–258 K has been observed in CaRuO3/La2/3Ca1/3MnO3 (CRO/LCMO) superlattices the ultrathin LCMO layer 0.8–3.2 nm thick. This contradicts antiferromagnetic or low-TC insulating single-layer thin-films. TC and saturated magnetization are determined dominantly by thicknesses, indicating no direct magnetic contribution from CRO layers interfaces. Also, they less sensitive to growth oxygen pressure as compared pure films. We...

A low-intensity ultraviolet photodetector (PD), with a gain as high ∼2.4 × 106, has been successfully constructed based on gallium (Ga) doped zinc sulfide (ZnS) nanoribbons (NRs). The device exhibits excellent photoconductive properties upon bias voltage low ∼0.01 V in terms of sensitivity to UV light an intensity 1 μW cm−2 (corresponding incident power 10−14 W), relatively fast response times ∼3.2 ms, and extremely detectivity ∼1.3 1019 cm Hz1/2 W−1. time are attributed the ohmic contact...

By using La0.7Sr0.3MnO3 (L) and SrRuO3 (S) electrodes, epitaxial Pb(Zr0.52Ti0.48)O3 (PZT) capacitors with different electrode configurations, i.e., L/PZT/L (from top to bottom) (a), S/PZT/S (b), S/PZT/L (c), L/PZT/S (d), have been fabricated the process-induced imprint was investigated. All as-grown are nearly imprint-free; however, after being annealed at 10−5 Torr of O2 a (b) show large negative (positive) imprinted polarization (P) state zero electric-field (E), c give strongly pinched...

Sm0.5Nd0.5NiO3 (SNNO) films with metal-insulator transition (MIT) at room-temperature (∼300 K) have been grown on NdGaO3 (001) substrates by pulsed laser deposition. By modifying the parameters of oxygen pressure, substrate temperature, and film thickness, role vacancies strain relaxation MIT SNNO was systematically analyzed. The status carefully characterized means high resolution x-ray diffraction. results revealed that for fully strained (≤20 nm) an increment deposition pressure (and/or...

In order to suppress the immoderate growth of intermetallic compounds (IMCs) at Sn-Cu bonding interface, we transferred multilayer graphene between Sn solder and Cu film sample as an interlayer. Then, external pressure ∼350 N was applied two samples 150 °C for 5 min realize using a thermo-compression machine. After bonding, placed in oven aging test. The IMC layer grew interface gradually with duration increasing both cases. rate interlayer is much lower than that without For 72 h aging,...

A single-element antenna is usually unable to meet the communication requirements of wireless system, and main solution use array antenna. The desire reduce weight cost gave rise sparse array. linearly polarized with ultra-wideband wide-angle scanning characteristics based on genetic algorithm (GA) developed in this paper. consists 40 units, which arranged by rectangular side length 300 mm. Compared conventional periodic array, proposed has reduced about 190 elements. can achieve S11 <...

In this communication, a method for extracting multimode S-parameters in guided-wave structures is presented based on the finite-difference time-domain electromagnetic conjunction with frequency domain (FD) singular value decomposition scheme. The present can calculate directly from field distribution FD. It found that proposed modal analysis and S-parameter extraction agree excellently analytic other available simulation techniques. Also, validated by various microstrip discontinuities.

In this paper, a wideband quadrangular pyramid conformal printed dipole antenna is designed, manufactured, and tested. The proposed comprises four dipoles pointing in different directions pairs of parasitic patches. Each pair patches are placed on one side the pyramid. simulated impedance bandwidth exceeds 26% (S11 ≤ −10 dB), with taper varied from 0∘ to 20∘. Omnidirectional radiation characteristics can be realized within working bandwidth. prototype 10∘ fabricated measured. Moreover,...

A wideband dual-circularly polarized (dual-CP) magneto-electric (ME) dipole reflectarray with independent beam control is reported. dual-CP phase shifting unit cell proposed to provide manipulation on the two CP waves. For proof, a 2×2 bit operating at X-band 16×16 elements developed different directions. The results show that peak gain of prototype up 23.85 dBic 10.5 GHz an aperture efficiency 30.2%. joint bandwidth for 3-dB AR and around 22.5% (9.25-11.5 GHz). With advantages wide control,...

In this paper, a 4.2–7.2 GHz (52.6%) beam-steering microstrip antenna was proposed. The proposed consists of three tapered slots and feeds. radiation directions the on plane are independent each other, feeds correspond to structures. Symmetry isolation trenches introduced improve between different ports. Radiation pattern simulation measurement show horizontal beam steering at sampled frequencies 4.2, 5, 6, 7.2 GHz. results shows that overlapped ports in E-plane H-plane can cover more than...

It is well known that the matrix condition number of discretized formulation for analyzing multiscale objects very large, because include interaction between discrete unknowns in different sizes. The traditional efficient preconditioners analysis homogeneous are not anymore or cannot be directly extended solution objects. A good quality compressed block decomposition preconditioner constructed to speed up convergence rate Krylov iterations this communication by using adaptive grouping...

In this paper, we have presented full-wave analysis of the microstrip-to-CPW right-angled transition with via-hole by finite difference time-domain (FDTD) method. Compensations been done to get ideal return loss and insertion loss. Frequency dependent characteristics are obtained via Fourier transform time domain results. Numerical results optimized structure FDTD, is better than -0.8 dB lower -12 from 30 100 GHz.

In this paper, different approaches to calculate the characteristic impedance of slotlines by finite difference time domain (FDTD) method is presented. It shows that for non-TEM mode transmission lines, definitions Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> yield completely results. Then a more rational definition proposed. Result obtained and compared with other definitions.

In this paper, a new method which combines FDTD simulation with cascade connection of sub-circuit general scattering matrices (GSMs) is presented for optimizing circuit containing irregular structure. This construct matrix global structure effectively and efficiently by using extracted GSMs sub-circuits instead compact element model, difficult to be extracted. By comparing the S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> an...

In this paper, hybrid finite-difference time-domain method(FDTD) and singular value decomposition(SVD), denoted by FDTD-SVD, is applied to analyze the double-ridge waveguide dominant mode. Double-ridge (WRD) without fillets WRD with small are analyzed. The simulation results show can achieve a single-mode operation of TE10 from 35GHz 112 GHz. For fillets, its frequency band 35-116GHz. These almost consistent detailed parametric study result(38-120GHz)based on Ansys HFSS, which proves that...

Abstract In order to quickly analyze discontinuity or periodic structure transmission characteristics, the combination of finite‐difference time‐domain method and singular value decomposition is applied. A double‐ridge waveguide (WRD) its improvement are studied. According simulation results about propagation constant eigen‐functions, performance WRD can be improved by adding fillets enlarging radius filling dielectric material. Guided wave mode characteristics substrate integrated (SIW)...