Abstract We study the Page curve for eternal Garfinkle–Horowitz–Strominger dilaton black holes in four dimensional asymptotically flat spacetime by using island paradigm. The results demonstrate that without island, entanglement entropy of Hawking radiation is proportional to time and becomes divergent at late times. While taking account existence outside event horizon, stops growing times eventually reaches a saturation value. This value twice Bekenstein–Hawking consistent with finiteness...

We study the Page curve and information paradox for Ba\~nados-Teiteboim-Zanelli black hole coupled to two thermal baths by applying island paradigm. prove that as locates outside event horizon, entanglement entropy of Hawking radiation finite temperature holes obeys curve. However, extremal rotating holes, time scrambling become divergent. To avoid ill-defined nature time, we consider contribution superradiance, which is a process can extract rotational energy from holes. The superradiance...

A large positive magnetic entropy change ΔSM is observed in the metallic antiperovskite Mn3GaC near its first-order metamagnetic transition temperature 159 K where stoichiometric compound transforms from an antiferromagnetic to a canted ferromagnetic state accompanied by discontinuous volume of −0.46% without symmetry. The unusual field dependence shows very rapid linear increase zero saturation value within interval smaller than 1 T. broadening peak low with increasing creates plateau MCE,...

We demonstrate the exceptionally-high third-order nonlinearity of integrated mono-layer graphene-silicon hybrid optoelectronics, enabling ultralow power resonant optical bistability, self-induced regenerative oscillations, and coherent four-wave mixing, all at few femtojoule cavity recirculating energies.

The Fabbri-Russo model is a generalized of two-dimensional dilaton gravity theory with various parameters "$n$" describing specific gravities. Particularly, the Russo-Susskind-Thorlacius fits case $n=1$. In model, we investigate Page curves and entanglement island. Islands are considered in eternal evaporating black holes. Surprisingly, any hole, emergence islands causes rise entropy radiation to decelerate after time, satisfying principle unitarity. For holes, fine-grained reaches...

The paper describes the synthesis and characterization of magnetic properties magnetite/silica nanocomposites using a modified Stober method. Magnetite nanoparticles averaging 8-10 nm in diameter stabilized with oleic acid toluene were used as component nanocomposites. SQUID measurements ferromagnetic resonance spectroscopy performed at each stage to understand formed composites. Changes blocking temperature ZFC/FC curves correlated corresponding changes field spectra sample formation....

Abstract The island paradigm for the fine-grained entropy of Hawking radiation is applied to eternal charged accelerating black holes. In absence island, entanglement grows linearly and divergent at late times, while once outside event horizon taken into account, unitary Page curve reproduced naturally. impact charge acceleration on curves investigated times. For time scrambling time, they both increase as increases, decreasing increases. particular, neutral holes have largest time. It worth...

By employing the replica trick we study impact of parameter $n$ on modular entropy and capacity entanglement in End World (EoW) model island model, respectively. For EoW present $n$-dependent evolution curves under both microcanonical canonical ensembles. In particular, ensemble, all quantities decrease as increases at late times. develop geometry for finite re-evaluate a two-sided eternal Jackiw-Teitelboim black hole coupled with thermal bath. case single configuration, closely resemble...

Abstract We consider the entanglement island in a deformed Jackiw–Teitelboim black hole presence of phase transition. This has van der Waals–Maxwell-like structure as it is coupled with Maxwell field. study behavior Page curve this by using paradigm. In fixed charge ensemble, we discuss different situations charges that influence system’s structure. There only Hawking–Page transition absence charges, which leads to an unstable small hole. Hence, related does not exist. However, occurs...

This study focuses on the examination of island rule within context four-dimensional Reissner-Nordström-anti-de Sitter (4D RN-AdS) black holes, illuminating intricate relationship between entanglement entropy and phase transitions holes. The 4D RN-AdS holes follows anticipated linear growth pattern before ultimately declining to a constant value, in accordance with well-established Page curve. novelty this lies influence, previously unexplored, first-order transition shape evolution curve...

A new type of mixed-valence polyoxoanionic cluster, [VV13VIV3O42(Cl)]8−, composed 14 {VO5} square pyramids and 2 {VO4} tetrahedral units, hosting a chloride ion has been synthesized characterized.

A finite-temperature theory of magnetism in amorphous magnetic alloys with strong environment effects is developed on the basis functional integral method for thermal spin fluctuations and distribution-function random distribution local moments. The drastically simplifies numerical calculations by means geometrical-mean model structure as well electronic structure, allows us to investigate transition-metal large difference atomic size via average coordination number which depends type...

Cr- and Fe-doped SnO2 films were deposited on Al2O3 substrates by pulsed-laser deposition. X-ray-diffraction patterns show that the have rutile structure grow epitaxially along (101) plane. The diffraction peaks of Cr-doped samples exhibit a systematic shift toward higher angles with increasing Cr concentration. This indicates dissolves in SnO2. On other hand, there is no obvious samples. magnetization curves indicate are paramagnetic at 300 5K. ferromagnetic behavior Zero-field-cooled...

Permalloy antidot arrays with different square hole sizes (1200×1200, 800×800, and 400×400nm2) have been fabricated by means of electron-beam lithography lift-off techniques. The smaller size results in enhanced remanence reduced coercivity the array. Multiple resonance modes were clearly observed for magnetic field applied normal to array plane, double uniform occurred when deviated more than 30° from plane. Two distinct dipolar patterns orientations magnitudes split into modes. show...

Nanoporous AAO (Anodic Aluminum Oxide) membranes have many advantages as a template for variety of magnetic materials. Materials can be embedded into the pores by electrodeposition, sputtering or magnetic-field-assisted infiltration nanoparticles. This work focuses on fabrication structures in templates electrodeposition. Our method allows controlled growth Co nanostructures within porous alumina membrane form dots, rods and long wires. The shape has been investigated field emission scanning...

Trilayered ruthenate ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{3}{\mathrm{O}}_{10}$ exhibits an interesting itinerant metamagnetic transition for magnetic fields applied along in-plane directions. Our earlier work has revealed that this occurs via a phase separation process with domain formation [Z. Q. Mao et al., Phys. Rev. Lett. 96, 077205 (2006)]. We recently performed systematic investigations on its magnetotransport properties and constructed field--temperature $(H\text{\ensuremath{-}}T)$...

We report on the dynamic properties of Permalloy nanostrips at gagahertz frequencies. The thickness strips is 100nm, strip width 300nm, spacing 1μm, and length 0.3–100μm; aspect ratios are 1:1, 1:2, 1:3, 1:5, 1:10, 1:333. behavior was studied by network analyzer ferromagnetic resonance (FMR) using a coplanar waveguide in flip-chip geometry. FMR mode frequencies (fr) can be controlled ratio as well applied magnetic field (H). In longer (1:10 1:333), excitation show soft (Heff=990Oe) when...

Arrays consisting of nanosized stripes Permalloy with different length-to-width ratios have been fabricated using electron beam nanolithography, magnetron sputtering, and lift-off process. These a thickness 100nm, width 300nm, lengths ranging from 300nmto100μm. The are separated by distance 1μm. Magnetization hysteresis loops were measured superconducting quantum interference device susceptometer. Microwave absorption at 9.8GHz was determined means ferromagnetic resonance technique....

We have fabricated Fe∕Sm–Co bilayers with gradient Fe thicknesses in order to systematically study the dependence of exchange coupling on thickness layer. The layer was deposited at two different temperatures (150 and 300°C) effect deposition temperature coupling. Magneto-optical Kerr x-ray magnetic circular dichroism (XMCD) been employed as nondestructive rapid characterization tools map properties samples. Systematic enhancement between soft hard is observed decreased. Separate couplings...

Pure HfO2 and Gd-doped thin films have been grown on different single crystal substrates (silicon, R-Al2O3, LaAlO3) by pulsed laser deposition. X-ray diffraction (XRD) patterns show that the pure are of monoclinic phase. same XRD pattern except their peaks a shift toward lower angles, which indicates Gd dissolves in HfO2. Transmission electron microscopy images columnar growth films. Very weak ferromagnetism is observed at 300 5K, attributed to either impure target materials or signals from...