Articles

Spin mixing conductance (\(g_r^{ \uparrow \downarrow }\)) and spin interface transparency at the interface of epitaxial Co₂Fe_0.4Mn_0.6Si Heusler alloy and Pt has be studied by inverse spin Hall effect and spin pumping measurements. Highest value of \(g_r^{ \uparrow \downarrow }\) = 1.70 × 10²⁰ m⁻² is observed compared to any other ferromagnetic -Pt heterostructures. Further, a high value of spin interface transparency (~83%) is observed, which makes Co₂Fe_0.4Mn_0.6Si/Pt heterostructure a potential candidate for the development of power efficient spintronics devices.

A hitherto unappreciated shear-strain-mediated magnetoelectric coupling effect with highly tunable ferromagnetic resonance by electric field is demonstrated by using the ferroelastic domain engineering of the ferroelectric substrate. The pure shear strain, instead of magnetic field and electric current, control of Kerr signal with superior stability and nonvolatile behaviors shows promising applications in next-generation lightweight, energy efficient magnetoelectric microwave devices and spintronic devices.

Infrared spectral and spatial imaging configurations were developed based on near-infrared graphene quantum dots with ultranarrow half-width (FWHM = 21 nm). The spectral imaging is obtained without a spectrometer and the spatial imaging exceeds the limits of resolution (superresolved imaging). The superresolved sensing is obtained due to the unique temporal and spectral properties of the quantum dot.

a Aging-time dependent saturation magnetostriction for Fe₇₃Ga₂₇ random polycrystals. Bright-field images for the b 1373 K-quenched, c 1 h-aged and d 12 h-aged Fe₇₃Ga₂₇ random polycrystals. e Figure of merit as a function of aging time for Fe₈₁Ga₁₉ random polycrystals. f Comparison of saturation magnetostriction among our optimally aged Fe–Ga random polycrystals, the quenched random polycrystals doped with a third element and the single crystals.

A sponge-like double-layer porous (SLDLP) structure is reported to simulate synapse in our work. The results of the study provide the method, structure, and model of the device to clarify the mechanism of the synaptic behaviors.

Stretchable and wearable Ag-PTFE conductors were fabricated by the simple and mature co-sputtering process with variations in the DC/RF power ratio applied to the Ag and PTFE target. A stretching test was conducted 40% strain under all conditions and reversible to confirm that the hysteresis and stretchability were good for DC 5 W:RF 40 W.

We present an in vitro model of the peripheral nervous system by establishing a coculture of motor neurons (MNs) and Schwann cells (SCs) in a microengineered hydrogel scaffold. This 3D microenvironment allowed the axons of MNs to actively interact with SCs during their growth and maturation. Treating the MN–SC coculture model with ascorbic acid induced myelin formation on axon fibers. Moreover, this can be reversed by treating myelinated nerve fibers with glial growth factor to potentially block the formation of the myelin sheath and induce demyelination. Our model may offer new opportunities to study pathophysiological processes involved in neurodegenerative diseases.

A novel 3D self-supported integrated electrode of Co₄N@CoSA/N-CNT/CC is designed for admirable HER electrocatalysis. Experiment and theory studies reveal that the suitable d-band center and electron-charge transfer optimized by Co₄N nanoparticles and single-atom Co in the electrocatalyst contribute to an excellent performance. This electrode requires overpotentials of only 78 and 86 mV at 10 mA cm⁻² in acidic and basic electrolytes, respectively. Notably, Co₄N@CoSA/N-CNT/CC also exhibits superior long-term stability in acidic and alkaline medium, the decrease in current density after continuous electrocatalysis for 50 h are only 5% and 11%, respectively.

Combining Lorentz transmission electron microscopy and micromagnetic simulations, we discover a high-density homochiral Néel-type skyrmion phase in a Pt/Co/Ru/Pt/CoFeB/Ru magnetic multilayer structure that is stable at high temperatures up to 733 K. The domain phase in this system can be modulated between a high-density skyrmion phase, an isolated skyrmion phase, or a stripe domain phase by appropriate tuning of external and material parameters. This finding suggests that multilayer Néel-type skyrmions can be utilized in nonvolatile spin-based electronic devices that require operation at elevated temperatures.

Ultra-fast electrochromic supercapacitors (ECSs) are demonstrated based on mesoporous WO₃ prepared by evaporation-induced self-assembly (EISA). Mesoporous WO₃ based ECSs show excellent electrochromic and supercapacitor performances under fast operating condition. Furthermore, printing assisted EISA is introduced to produce patterned mesoporous WO₃ for ECS displays (ECSDs). The resulting ECSDs have great potential as next-generation smart electrochemical components.

There is a fundamental divide in symmetry between crystalline and glassy materials, where the structural disorder in glass leads to unique material properties and a myriad of applications. The provision of metrics for describing the order within disorder remains, however, an open challenge, especially on length scales beyond the nearest neighbor that are characterized by rich structural complexity. Here, we address this challenge by applying the method of persistent homology to characterize the structure of silica glass. The structural disorder is systematically engineered by preparing the glass under different high-pressure and temperature conditions, which impacts on the low-frequency vibrational and thermodynamic properties.

Zr₂SP₂O₁₂ has unique negative thermal expansion behavior involving both phase transition- and framework-type mechanisms. The volumetric CTE of α-Zr₂SP₂O₁₂ is approximately −70 ppm/K during the isosymmetric phase transition in the temperature range of 393–453 K. This value can be improved by decreasing the proportion of sulfur. The minimum volumetric CTE of α-Zr₂S_0.9P₂O_12-δ is approximately −108 ppm/K.

Flexible high-performance hybrid graphene photodetectors have been developed by introducing both perovskite materials and gold nanostars. The developed photodetectors exhibit significantly enhanced optoelectronic performances due to the synergistic effects of hybrid system including high light absorption of perovskites and strong plasmonic effects of gold nanostars with high mechanical stability, which extends the range of their practical applications.

We report on the formation and rupture of CFs through Ag ion migration inside a single-crystalline 2D van der Waals (vdW) solid electrolyte material within an ECM device structure. This study provides clear experimental evidence that CFs consisting of Ag can be formed inside single-crystalline 2D layered chromium thiophosphate (CrPS₄) and their configuration can be changed by an applied voltage. Density functional theory calculations confirm that the Ag ion migration is an energetically favorable process. The electrically induced changes in Ag CFs inside single-crystalline CrPS₄ raise the possibility of a reliable ECM device that exploits the properties of two-dimensionally confined materials.

The formation of the conductive region (n⁺ layer) in (Zn,Ba)SnO₃ (ZBTO) semiconductor is proposed to achieve high performance of thin-film transistors (TFTs). The aluminum metal capping layer is adopted to enhance the field-effect mobility of ZBTO TFTs. The capped Al layer takes out oxygen in the back-channel region, where the AlO_x interlayer is formed. As a result, the field-effect mobility of Al-capped ZBTO TFTs is remarkably increased from 20.8 to 153.4 cm²/Vs. Furthermore, the Al-capped ZBTO TFTs are stable even when exposed to air for 3 months.

We demonstrate an artificial tactile sensor system with a sensory neuron and a perceptual synaptic network that is composed of a single device type, i.e., a semivolatile carbon nanotube transistor. The system can differentiate the temporal features of tactile patterns, and its recognition accuracy can be improved by an iterative learning process.

We propose a novel approach to enhance the synaptic behavior of a SiN_x/a-Si bilayer memristor through Ge implantation. The SiN_x and a-Si layers serve as switching and internal current limiting layers, respectively. Ge implantation induces structural defects in the bulk and surface regions of the a-Si layer, enabling spatially uniform Ag migration and nanocluster formation in the upper SiN_x layer and increasing the conductance of the a-Si layer. As a result, the analog synaptic behavior of the SiN_x/a-Si bilayer memristor, such as the nonlinearity, on/off ratio, and retention time, is remarkably improved.

We report the synthesis of L,L-diphenylalanine conjugated BF₂-oxasmaragdyrin (FF-BSC), and fabrication of monodispersed spherical self-assemblies (FF-BSC NP), using USP class 3 solvent-water mixture. FF-BSC NPs exhibited excellent photo-stability (NIR exposure), photothermal efficacy and NIR fluorescence. Further, the formulation was lyophilized to enhance the storage. In vivo studies of these nanoparticles, demonstrated nontoxicity, efficient whole-body NIRF imaging, fractional passive tumour homing, and excellent photothermal tumor ablation efficacy.

Mechanistic insights into the LSPR-mediated yet semiconductor-free photoelectrochemistry of H₂O₂ over Ag NWs under sunlight illumination.

Cobaltosic oxide hollow dodecahedra with abundant oxygen vacancy defects was synthesized and manifested extraordinary catalytic performance toward the oxygen evolution reaction.