Results in Physics最新文献

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Tuning the optoelectronic properties of GaAs/AlxGa1−xAs core/shell tetrapod quantum dots with a single dopant 用单一掺杂剂调谐GaAs/AlxGa1−xAs核/壳四足量子点的光电性能
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-17 DOI: 10.1016/j.rinp.2025.108281
A. Ed-Dahmouny , H.M. Althib , R. Arraoui , A. Fakkahi , M. Jaouane , H. Azmi , J. El-Hamouchi , K. El-Bakkari , A. Sali
{"title":"Tuning the optoelectronic properties of GaAs/AlxGa1−xAs core/shell tetrapod quantum dots with a single dopant","authors":"A. Ed-Dahmouny ,&nbsp;H.M. Althib ,&nbsp;R. Arraoui ,&nbsp;A. Fakkahi ,&nbsp;M. Jaouane ,&nbsp;H. Azmi ,&nbsp;J. El-Hamouchi ,&nbsp;K. El-Bakkari ,&nbsp;A. Sali","doi":"10.1016/j.rinp.2025.108281","DOIUrl":"10.1016/j.rinp.2025.108281","url":null,"abstract":"<div><div>This study investigates the optical properties of a novel core–shell tetrapod nanostructure composed of a GaAs core and an Al<span><math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math></span>Ga<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span>As shell. Our focus is on understanding how its shape, geometry, and external factors influence its optical evolution. The aluminum concentration, <span><math><mi>x</mi></math></span>, within the shell serves as a crucial parameter, directly controlling the confinement well depth, and our analysis employs the finite element method (FEM). Specifically, we investigated the influence of dopant position along the (<span><math><mrow><mi>O</mi><mi>z</mi></mrow></math></span>) axis and aluminum concentration on the first three energy levels. We found that increasing the dopant distance from the electron and raising the aluminum concentration both contribute to an increase in the energy levels, attributed to a deeper confinement well. Additionally, we examined the linear, non-linear, and total optical absorption coefficient (OAC) and total refractive index change (RIC) for the two low-lying energy transitions 1<span><math><mo>→</mo></math></span>2 and 2<span><math><mo>→</mo></math></span>3. The results reveal a blueshift and a decrease in amplitude for the 1<span><math><mo>→</mo></math></span>2 transition as the aluminum concentration increases. Expanding on previous experimental results, this research highlights the potential of these structures for groundbreaking applications in nanoelectronics and next-generation solar cells.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108281"},"PeriodicalIF":4.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
All-optical memory based on surface plasmons and Kerr-type nonlinear cavity 基于表面等离子体和克尔型非线性腔的全光存储器
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-17 DOI: 10.1016/j.rinp.2025.108301
Dariush Jafari, Mohammad Danaie
{"title":"All-optical memory based on surface plasmons and Kerr-type nonlinear cavity","authors":"Dariush Jafari,&nbsp;Mohammad Danaie","doi":"10.1016/j.rinp.2025.108301","DOIUrl":"10.1016/j.rinp.2025.108301","url":null,"abstract":"<div><div>This paper presents a novel ultra-fast all-optical plasmonic memory architecture designed for next-generation integrated photonic circuits. The proposed memory cell employs metal–insulator-metal (MIM) plasmonic waveguides integrated with Kerr-type nonlinear nanocavities to enable efficient all-optical switching. Through systematic finite-difference time-domain (FDTD) simulations, we demonstrate robust operation across standard telecommunication wavelengths while maintaining precise wavelength tunability. The optimized design achieves remarkable performance metrics, including an ultra-low enable intensity of 7 MW/cm<sup>2</sup>, a compact footprint of 1.2 μm<sup>2</sup>, and sub-100-femtosecond switching speeds. Detailed analysis of Poynting vector distributions reveals how plasmonic nanocavity resonances facilitate optical bistability, providing critical insights into the operational mechanism. Compared with existing all-optical memory solutions, our architecture offers superior power efficiency, enhanced transmission contrast, and higher integration density. These advantages position the proposed design as an ideal candidate for high-performance optical computing systems and on-chip memory applications, addressing key challenges in photonic data processing.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108301"},"PeriodicalIF":4.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bioconvection in polar fluid with microstructure: A fractional heat and mass transfer model with non-singular and non-local kernel 微观结构极性流体中的生物对流:非奇异非局域核分数传热传质模型
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-12 DOI: 10.1016/j.rinp.2025.108292
Frahad Ali , Zulikha Shah , Nadeem Ahmad Sheikh , Sultan Alshehery , Ilyas Khan , Wei Sin Koh
{"title":"Bioconvection in polar fluid with microstructure: A fractional heat and mass transfer model with non-singular and non-local kernel","authors":"Frahad Ali ,&nbsp;Zulikha Shah ,&nbsp;Nadeem Ahmad Sheikh ,&nbsp;Sultan Alshehery ,&nbsp;Ilyas Khan ,&nbsp;Wei Sin Koh","doi":"10.1016/j.rinp.2025.108292","DOIUrl":"10.1016/j.rinp.2025.108292","url":null,"abstract":"<div><div>Bioconvection flows occur in working fluids where the growth of microorganisms is subject to convective flows. Understanding the flow behavior of these fluids is essential for many biological and environmental processes, such as the purification of water, drug delivery, and microbial ecology. This article explores the bioconvection flow over a vertical flat plate, involving a micropolar fluid with mass and heat transfer. In the beginning, partial differential equations (PDEs) are used to formulate the problem, which use a non-singular and non-local kernel to take into consideration the memory impacts of the system. The problem is formulated and exact solutions are obtained by using the Laplace transform technique, finding solutions that satisfy both the governing equations and specific conditions, and then representing these solutions graphically. The statement highlights the importance of considering variable Prandtl number in thermal boundary layer modeling. When viscosity and thermal conductivity depend on temperature, treating Prandtl number as a variable is crucial for accurate results. Specifically, as thermal conductivity parameter increases, it leads to higher velocities and temperatures within the boundary layers being studied. Understanding the effect of mass Schmidt number is essential in various practical applications such as chemical engineering processes, where precise control of mass transfer is important for optimizing reactions and product quality in micropolar fluid systems. When Schmidt number increases, it means that momentum diffusion (viscosity) dominates over mass diffusion, causing species to diffuse more slowly in the fluid. One of the key advantages of fractional derivatives like the ABC operator is their ability to model memory effects in systems, where past states influence current behavior. This is particularly important in fields like control theory, neurodynamics, fluid dynamics, and finance, where historical data impacts future behavior. Engineering interest quantities are also calculated and shown in tabular form.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108292"},"PeriodicalIF":4.4,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144083821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical analysis of spectroscopic studies using supercontinuum generated by noise-like pulses 类噪声脉冲产生的超连续光谱研究的数值分析
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-11 DOI: 10.1016/j.rinp.2025.108298
Christian A. Salcedo-Rodriguez , Eloisa Gallegos-Arellano , Julian M. Estudillo-Ayala , Juan M. Sierra-Hernandez , Jose D. Filoteo-Razo , Maximino R. Tapia-Garcia , Daniel A. Ramos-Gonzalez , Roberto Rojas-Laguna , Juan C. Hernandez-Garcia
{"title":"Numerical analysis of spectroscopic studies using supercontinuum generated by noise-like pulses","authors":"Christian A. Salcedo-Rodriguez ,&nbsp;Eloisa Gallegos-Arellano ,&nbsp;Julian M. Estudillo-Ayala ,&nbsp;Juan M. Sierra-Hernandez ,&nbsp;Jose D. Filoteo-Razo ,&nbsp;Maximino R. Tapia-Garcia ,&nbsp;Daniel A. Ramos-Gonzalez ,&nbsp;Roberto Rojas-Laguna ,&nbsp;Juan C. Hernandez-Garcia","doi":"10.1016/j.rinp.2025.108298","DOIUrl":"10.1016/j.rinp.2025.108298","url":null,"abstract":"<div><div>Multiple Supercontinuum (SC) spectra generated by noise-like pulses (NLPs) were subjected to numerical analysis to assess their viability for gas detection. The numerical setup employed for this study was a figure-eight fiber laser using a mode-locking configuration. This configuration included a nonlinear optical loop mirror, which functions as an amplitude filter, and a double-clad erbium-ytterbium fiber, which serves as the active element. The absorption spectrum of the gas C<sub>2</sub>H<sub>2</sub> in the near-infrared region, obtained from the HITRAN database, was analyzed for the proposed numerical setup. The analysis revealed distinct outcomes in terms of sensitivity, depending on the type of NLP generated through polarization manipulation. Some spectra maintained most of the gas rovibrational lines and frequency components, thus facilitating the proper gas identification. Simulations were also performed for CH<sub>4</sub>, showing a visible absorption spectrum, thereby substantiating that these sources powered by NLPs can detect various gases with a high degree of selectivity.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108298"},"PeriodicalIF":4.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Energy fluctuations and transitions in non-equilibrium inter-particle collisions 非平衡粒子间碰撞中的能量波动和跃迁
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-11 DOI: 10.1016/j.rinp.2025.108276
Tongli Wei , Xiansheng Cao , Yaojin Li , Chenglong Jia
{"title":"Energy fluctuations and transitions in non-equilibrium inter-particle collisions","authors":"Tongli Wei ,&nbsp;Xiansheng Cao ,&nbsp;Yaojin Li ,&nbsp;Chenglong Jia","doi":"10.1016/j.rinp.2025.108276","DOIUrl":"10.1016/j.rinp.2025.108276","url":null,"abstract":"<div><div>The energy fluctuations and transitions, as well as the random forces, of a Brownian particle in the short-time limit of one single collision are studied using microscopic kinetic theory. Fluctuations and random forces play fundamental roles in non-equilibrium dynamics and statistical mechanics. We find that the mean-square of random forces is proportional to the energy fluctuation for Brown particles. By considering collision processes between an incident particle and background molecules within the framework of the hard-sphere collision model, we analytically investigate energy fluctuations and transitions based on microscopic kinetic theories. Results for the example of the thermal equilibrium gas show that the energy fluctuations arise from two distinct contributions: kinetic fluctuations resulting from the random selection of scattering cross-section positions, which are proportional to the particle’s initial energy; and thermal fluctuations associated with the velocity distribution of molecules, which are proportional to gas temperature. We demonstrate that the energy flux density is equal to the temperature difference <span><math><mrow><mi>Δ</mi><mi>T</mi></mrow></math></span> multiplied by the thermal conductivity coefficient <span><math><mi>κ</mi></math></span> in two mixed gases under thermal equilibrium. Therefore, a microscopic kinetic perspective is provided for the second law of thermodynamics in this specific scenario. Our finding helps understand random dynamics and relaxation processes in non-equilibrium systems.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108276"},"PeriodicalIF":4.4,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantum coherence and phase-space nonclassicality in k-photon thermal-noisy nonlinear JCM with atomic motion 具有原子运动的k光子热噪声非线性JCM的量子相干性和相空间非经典性
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-09 DOI: 10.1016/j.rinp.2025.108279
Shima Manzari-Tavakoli , Hamid Reza Baghshahi , Mohammad Javad Faghihi
{"title":"Quantum coherence and phase-space nonclassicality in k-photon thermal-noisy nonlinear JCM with atomic motion","authors":"Shima Manzari-Tavakoli ,&nbsp;Hamid Reza Baghshahi ,&nbsp;Mohammad Javad Faghihi","doi":"10.1016/j.rinp.2025.108279","DOIUrl":"10.1016/j.rinp.2025.108279","url":null,"abstract":"<div><div>In this paper, we study the quantum interaction between a moving two-level atom and a single-mode quantized field in an optical cavity with degenerate multi-photon transition, in the presence of intensity-dependent coupling and thermal effect. We introduce the appropriate Hamiltonian of the system, and we adopt the initial condition of subsystems, in which the atom is prepared in an arbitrary superposition of ground and excited states, and the field is considered in a thermal state. Consequently, we determine the density matrix of the entire system at any given time. We further assess some of the most important quantum properties, such as quantum coherence, sub-Poissonian statistics, and phase-space nonclassicality by means of negativity of the Wigner quasiprobability distribution function. We then investigate the impact of intensity-dependent nonlinearity, thermal noise, atomic motion, and multi-photon transition on these quantum properties. The numerical results show that the nonclassicality criteria can be significantly influenced and controlled by the effects discussed above. Interestingly, increasing the mean thermal photon number, which highlights the thermal effect, can, in some cases, enhance the nonclassicality features of the system.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108279"},"PeriodicalIF":4.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dynamic control of polarization and diffraction in tunable Surface-Relief Liquid-Crystal gratings 可调表面浮雕液晶光栅偏振和衍射的动态控制
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-09 DOI: 10.1016/j.rinp.2025.108297
Pravinraj Selvaraj , Chih-Wei Lin , Yi-Xuan Liu, Chi-Tang Huang, Jie-Sin Jhong, Ching-Cherng Sun, Ko-Ting Cheng
{"title":"Dynamic control of polarization and diffraction in tunable Surface-Relief Liquid-Crystal gratings","authors":"Pravinraj Selvaraj ,&nbsp;Chih-Wei Lin ,&nbsp;Yi-Xuan Liu,&nbsp;Chi-Tang Huang,&nbsp;Jie-Sin Jhong,&nbsp;Ching-Cherng Sun,&nbsp;Ko-Ting Cheng","doi":"10.1016/j.rinp.2025.108297","DOIUrl":"10.1016/j.rinp.2025.108297","url":null,"abstract":"<div><div>The precise phase control of light is essential for advancing photonic devices. This study presents electrically tunable liquid–crystal (LC) surface-relief gratings (SRGs) comprising periodic SU-8 photoresist (PR) structures, showcasing notable electro-optical properties. The SRG comprises a periodicity of alternating PR-coated (Region B) and uncoated (Region A) regions. When a DC voltage is applied, Region A exhibits a transmittance shift upon exceeding a threshold voltage, with incomplete recovery when the voltage is reduced. This non-reversible behavior likely stems from ionic migration toward the electrodes, creating an internal electric field. Conversely, Region B acts as an effective shield, stabilizing the electric double layer and minimizing transmittance changes. However, AC stimuli restrict ionic mobility, with higher frequencies leading to increased threshold voltage, particularly in Region B. Analysis of the Stokes parameters further demonstrates that the grating facilitates voltage-controlled tuning of diffraction orders while maintaining polarization stability. By optimizing DC driving schemes, higher diffraction orders can be selectively enhanced, allowing for low-voltage operation and multi-order diffraction, which is crucial for wide-angle holographic displays. These findings lay the groundwork for a robust platform for dynamic light manipulation, paving the way for next-generation tunable photonic systems and advanced display technologies.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108297"},"PeriodicalIF":4.4,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of low concentration glucose solution using Raman spectroscopy based on the internal standard method 基于内标法的拉曼光谱法测定低浓度葡萄糖溶液
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-07 DOI: 10.1016/j.rinp.2025.108272
Kang Du , Meng Zhao , Yangyang Hua , Shuaifei Wei , Tingting Wang , Guannan Qu , Hongxing Cai
{"title":"Determination of low concentration glucose solution using Raman spectroscopy based on the internal standard method","authors":"Kang Du ,&nbsp;Meng Zhao ,&nbsp;Yangyang Hua ,&nbsp;Shuaifei Wei ,&nbsp;Tingting Wang ,&nbsp;Guannan Qu ,&nbsp;Hongxing Cai","doi":"10.1016/j.rinp.2025.108272","DOIUrl":"10.1016/j.rinp.2025.108272","url":null,"abstract":"<div><div>Glucose is an essential substance for life and exists in a cyclic equilibrium in solution. Raman spectroscopy is utilized to differentiate substances based on their glucose concentration. This study employed solid-state density functional theory to simulate the Raman spectra of D(+)-glucose, D-glucose monohydrate, and two types of glucopyranose. Experimental spectra were obtained for D-glucose monohydrate and solutions of varying concentrations. The calculation results of various glucose configuration theories indicate that 1125 cm<sup>−1</sup> is the characteristic peak of glucose. This finding aligns with the experimental results and literature presented in this article, addressing concerns regarding the validity of glucose characteristic peaks.</div><div>The peak at 1640 cm<sup>−1</sup>, attributed to water, serves as the normalized internal standard. The correlation coefficients obtained from linear regression analysis were all greater than 0.990, with limits of detection (LOD) of 48.1 mg/dL and 40.3 mg/dL, respectively. The minimum detectable concentration (MDC) for qualitative analysis is 12.5 mg/dL. The relative area method has been demonstrated to be a direct and effective approach for accurately quantifying low-concentration glucose solutions.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108272"},"PeriodicalIF":4.4,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Co2+ ions doping in Ni0.7-xCoxZn0.3Fe2O4 nanoferrites: A study of structural, morphological, optical, and magnetic properties Co2+离子掺杂对Ni0.7-xCoxZn0.3Fe2O4纳米铁氧体结构、形貌、光学和磁性的影响
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-06 DOI: 10.1016/j.rinp.2025.108295
Baye Zinabe Kebede , Deepshikha Rathore , Khalid Mujasam Batoo , Paulos Taddesse Shibeshi
{"title":"Influence of Co2+ ions doping in Ni0.7-xCoxZn0.3Fe2O4 nanoferrites: A study of structural, morphological, optical, and magnetic properties","authors":"Baye Zinabe Kebede ,&nbsp;Deepshikha Rathore ,&nbsp;Khalid Mujasam Batoo ,&nbsp;Paulos Taddesse Shibeshi","doi":"10.1016/j.rinp.2025.108295","DOIUrl":"10.1016/j.rinp.2025.108295","url":null,"abstract":"<div><div>In the last few years, there has been a notable focus on the synthesis of soft magnetic nanoferrites with different properties for different applications. Highly efficient Cobalt (Co) assisted Ni<sub>0.7-x</sub>Co<sub>x</sub>Zn<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> (x = 0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoferrites were prepared via citrate gel combustion technique. XRD analysis revealed the single-phase cubic lattice growth, with a typical crystal size spanning between 33.81 and 42.45 nm. The unit cell volume and lattice parameter of Ni<sub>0.7-x</sub>Co<sub>x</sub>Zn<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> exhibited a significant increment with varying Co concentration (x = 0.1. 0.3, and 0.5), primarily because of expanded ionic radius of Co. Analysis with HRTEM revealed crystal sizes varying between 39.3 and 69.8 nm, confirming the nanocrystalline nature of the synthesized samples. Additionally, FESEM images indicated a spherical-like morphology for the nanoferrites. EDX analysis further validated the existence of all required elements such as Ni, Zn, Co, Fe, and O whitin the samples. SAED patterns and HRTEM images describe the pure and homogeneous crystalline cubic spinel lattice of nanoferrite including Moire fringes and d-spacing values consistent with XRD data and standard references. The FT-IR patterns exhibited absorption peaks within 533.1–545.6 cm<sup>−1</sup> range, associated with metal–oxygen bond stretching vibration. The optical characteristics of the nanoferrites indicated activity in both the ultraviolet and visible ranges. The enhancement of visible light absorption in Ni<sub>0.7</sub>Zn<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> nanoferrite through Co doping has been achieved. The band gap energy was noted to be reduced from 1.66 eV to 1.37 eV as the Co content increases from x  = 0.0 to 0.5 in Ni<sub>0.7-x</sub>Co<sub>x</sub>Zn<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> nanoferrites. Magnetic characterization of the Co-doped samples reveals significant enhancements in magnetic behaviour. Saturation magnetization (Ms) improved from 69.93 to 80.36 emu/g with Co-doping, indicating an improved magnetic response. Similarly, the coercivity (Hc) and remanent magnetization (Mr) showed substantial increases, from 86.18 Oe to 160.97 Oe and from 13.65 emu/g to 25.61 emu/g, respectively. Among the samples, the nanoferrite with x  = 0.4 exhibited the maximum value of Ms, while x  = 0.5 demonstrated the highest values of Mr and Hc, suggesting the impact of Co concentration on optimizing magnetic properties across different compositions. Hence, x  = 0.4 and 0.5 compositions of Ni<sub>0.7-x</sub>Co<sub>x</sub>Zn<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> nanoferrites would be strong candidates for electronic devices like sensors and memory strage.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"74 ","pages":"Article 108295"},"PeriodicalIF":4.4,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of asteroid belt and oblateness on the stability and orbits near triangular Lagrange points 小行星带和扁率对三角形拉格朗日点附近的稳定性和轨道的影响
IF 4.4 2区 物理与天体物理
Results in Physics Pub Date : 2025-05-06 DOI: 10.1016/j.rinp.2025.108253
Wenhui Liu, Fabao Gao, Bao Ma
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