The resistance switching characteristics of stoichiometric ZrO2 film were investigated for nonvolatile memory. Al∕ZrO2∕Al device presents reliable and reproducible behaviors. on/off ratio two stable states is larger than 2×103. It suggested that the current-voltage are governed by Schottky conduction mechanism in high voltage region, while filament low region. process explained terms spontaneous reversible reaction between electrode films with contribution Joule heating effect external...

Nanostructure arrays such as nanowire, nanopillar and nanocone have been proposed to be promising antireflection structures for photovoltaic applications due their great light trapping ability. In this paper, the optical properties of Si in visible infrared region were studied by both theoretical calculations experiments. The results show that Mie resonance can continuously tuned across a wide range wavelength varying diameter nanopillars. However, array with uniform exhibits only discrete...

In general metamaterial perfect absorber, the single meta-pattern makes absorption band. Therefore, multi-absorption bands need corresponding kinds of meta-patterns. Here, we introduce triple-band absorber utilizing only kind pattern. We also demonstrate mechanism triple absorption. The first and second were induced by fundamental magnetic resonance major minor axes, respectively, cut-wire bar. third peak was caused third-harmonic axis. Additionally, unexpected band formed, which overlapping...

Five structures (a tetrahedron and 3-, 4-, 5- 6-fold octahedrons) are shown in the upper panel of figure. Figures lower show fractions five Ge- Sb-centered clusters with temperature.

Crystalline Sb2Te3 is widely studied due to its important applications in memory materials and topological insulators. The liquid amorphous structures of this compound as well the dynamics upon quenching, however, are yet be fully understood. In work, we have systematically dynamical properties local structure at different temperatures using ab initio molecular simulations. calculated factors agree with experimental results. atomic number density mean-squared displacement a function...

Abstract The time-resolved magneto-optical (MO) Voigt effect can be utilized to study the Néel order dynamics in antiferromagnetic (AFM) materials, but it has been limited for collinear AFM spin configuration. Here, we have demonstrated that Mn 3 Sn with an inverse triangular structure, quench of by ultrafast laser pulses result a large modulation. modulated angle is significantly larger than polarization rotation due crystal-structure related linear dichroism and MO Kerr arising from...

The short-range order (SRO) in Pd78Cu6Si16 liquid was studied by high energy x-ray diffraction and ab initio molecular dynamics (MD) simulations. calculated pair correlation functions at different temperatures agree well with the experimental results. partial from intio MD simulations indicate that Si atoms prefer to be uniformly distributed while Cu tend aggregate. By performing structure analysis using Honeycutt-Andersen index, Voronoi tessellation atomic cluster alignment method, we show...

The local structures and dynamical properties of the liquid Cu${}_{80}$Si${}_{20}$ alloy have been studied by x-ray diffraction ab initio molecular dynamics (MD) simulations. pair-correlation functions structure factors derived from three-dimensional coordinates MD configurations agree well with experimental results. liquids is analyzed using Honeycutt-Andersen (HA) indices, Voronoi tessellation (VT), an atomic cluster-alignment method. HA indices analysis shows that pentagonal bipyramid, a...

We theoretically study the transmission spectrum of cavity field in a double-cavity optomechanical system with cross-Kerr (CK) effect. The consists two tunneling coupling cavities mechanical resonator as interface. By doping CK medium into resonator, couplings between fields and are introduced. investigate effects strength on field, including rate, nonreciprocity four-wave mixing (FWM). find that probe can show obvious transparent windows, which be widened by increasing strength. For fields,...

Silver/bismuth oxide composite thin films with Ag concentration varying from 13.2% to 59.3% were prepared by cosputtering in a multitarget magnetron sputtering system. The absorption spectra of these measured, and the peaks due surface plasmon resonance particles showed redshift behavior increasing concentration. By using femtosecond time-resolved optical Kerr effect technique under 800 nm wavelength, nonlinear properties investigated. signals an ultrafast rise, suggesting that main physical...

Strain effects make inverted penta-graphene nanotubes exhibit extraordinary 1D structural and semiconductor–metal transitions.

The probe of antiferromagnetic (AFM) spin dynamics in thin films has traditionally relied on the short x-ray pulses based magnetic dichroism or diffraction effect. Here, we demonstrate direct optical ultrafast laser-induced AFM CoO using time-resolved linear effect reflection geometry. laser excitation film leads to quench order, manifested as large polarization rotations reflected light. Far below N\'eel temperature $({T}_{\mathrm{N}})$, order occurs within 300 fs, which is faster than...

Magnetization ($\mathbit{M}$) precessions driven by ultrafast laser-induced nonthermal effects are observed in undoped yttrium iron garnet (YIG) films of (100) and (111) orientations using pump-probe time-resolved magneto-optical Kerr effect. The $\mathbit{M}$ show a strong dependence on the polarization direction linearly polarized pump pulses 400 nm. In contrast, we can barely observe any precession circularly pulses, which indicates that inverse Faraday effect is negligible. For case...

The magnetization orientation dependence of Gilbert damping and ultrafast demagnetization were investigated in single-crystalline ${\mathrm{Co}}_{50}{\mathrm{Fe}}_{50}$ films grown on a MgO(100) substrate by the time-resolved magneto-optical Kerr effect technique. intrinsic coefficient extracted from time evolution precessions shows remarkably large anisotropy with ratio more than 300% for orientations along $\ensuremath{\langle}100\ensuremath{\rangle}$...

The polar Kerr rotation and ellipticity spectra of the as-deposited annealed Zn1−xCoxO inhomogeneous magnetic semiconductors were measured. versus photon energy can be greatly modulated by adjusting Co concentration or annealing samples. Moreover, observed maximal rotation, 0.72°, in an sample is higher than that pure films, Pt∕Co multilayers, PtxCo1−x alloys. enhanced samples explained fact became a nanocomposite system consisting clusters semiconductor.

Abstract The electromagnetically-induced transparency (EIT)-like effects in planar and non-planar metamaterials (MMs) were investigated for microwave (GHz) frequencies. specific MMs used this study consisted of a cut-wire resonator ring resonator, where placed on the top bottom layers, respectively. A transmission window was produced, due to interference between bright- bright-mode coupling. Using numerical experimental results, we demonstrate that bending MM leads enhanced bandwidth, as...

Distribution of trigonal prism capped with three half-octahedra (orange clusters), archimedean anti-prism (green ones) and icosahedron (blue clusters in Pd₈₂Si₁₈ at different temperature (a) 900 K, (b) 1216 K. (c) Connection way clusters, pink ones are the sharing atoms.

For permalloy/FeMn bilayers, the exchange field and coercivity exponentially decay in time with application of an applied antiparallel to unidirectional anisotropy direction. The relative change field, 1−HE(t=∞)/HE(t=0), also decays exponential manner FeMn layer thickness. This dependence can be explained by using a thermal fluctuation theory. Moreover, calculations show that stability coupling is independent permalloy These findings may helpful design spin-valve giant magnetoresistance devices.

Optical control of magnetic anisotropy in ferromagnetic (FM) metals via non-thermal effects offers an intriguing route for the ultrafast magnetization control. Here, we report on strong modification exchange-coupling induced uniaxial (UMA) Fe/CoO below Néel temperature CoO owing to charge transfer excited by laser pulses. This UMA nonthermal is manifested as much smaller frequencies Fe spin precession initial 100-ps time range under 400-nm pump with excitation, compared 800-nm pure thermal...

Abstract Bismuth telluride (Bi 2 Te 3 ) has garnered significant interest in thermoelectric applications and three-dimensional topological insulators due to its unique electronic, transport, thermal properties. Bi Sb chalcogenide compounds have the same crystal structure. While been shown be a prototypical phase change memory (PCM) compound along pseudobinary tie-line of Ge-Sb-Te alloys, whether can also exhibit PCM functionality is still not well established. In this work, systematic study...

We report on the modulation of interlayer exchange coupling (IEC) between ferromagnet (FM) Fe and insulating antiferromagnet (AFM) CoO its impact Gilbert damping by a time-resolved magneto-optical Kerr effect technique. By inserting wedge spin conductor Ag layer at interface Fe/CoO, it is revealed that both uniform precession frequency constant film decrease with increasing thickness up to ∼2 nm, above eliminated IEC, these two parameters reach intrinsic values film. The also show similar...

In this article the magneto-optics of magneto-optical (M-O) layered structures have been studied theoretically and experimentally. For air/M-O/air configuration, an analytic expression between apparent complex Faraday rotation eigenvalue φ̃F=e1φ̃F′ can be obtained, when M-O layers are semitransparent weakly magnetic. The interference factor e1 is a function optical constants layer thickness d, light wavelength. these structures, consists two parts. One oscillates as other proportional to...