{"title":"Nanoindentation of nickel film by magnetron sputtering ion plating on sapphire: Molecular dynamics simulations and experiments","authors":"Shilong Sun, Bin You, Tianlei Dong, Yusheng Sui, Rongchuan Lin, Shasha Wei","doi":"10.1016/j.rinp.2025.108233","DOIUrl":"10.1016/j.rinp.2025.108233","url":null,"abstract":"<div><div>Magnetron sputtering deposition of metals on sapphire (<span><math><mi>α</mi></math></span>-Al<sub>2</sub>O<sub>3</sub>) has emerged as significant research focus in advanced manufacturing due to its critical role in enhancing sapphire’s performance. This study examines the effects of varying negative biases (60 V, 80 V, 100 V) and annealing treatments on the mechanical properties of Ni films deposited on sapphire. Molecular dynamics (MD) simulations and experimental validation based on results of deposition experiments. With increasing negative bias reduces the grain size of the Ni film and decreases the (111)/(100) phase ratio. After annealing, residual stress within film is released, resulting in increased grain size and a higher content of (100) phase. MD simulations reveal that higher negative biases lead to increased dislocation density in Ni film, with plastic deformation predominantly governed by Shockley and Stair-rod dislocations. After annealing, dislocation density decreases, and under 80 V and 100 V conditions, the emergence of Hirth dislocations facilitates earlier onset of plastic deformation. Differences in phase composition within Ni film cause atomic displacements during indentation to exhibit directionality, which diminishes after annealing. Furthermore, the von Mises strain initially decreases and then increases with rising negative bias. Notably, at 80 V, the film achieves an optimal balance of moderate grain size, low dislocation density, and controlled phase composition, minimizing von Mises strain and exhibiting the highest elastic modulus and hardness. The experimental findings align with MD simulation results based on the COMB3 potential, confirming the reliability of the simulations. This study provides theoretical insights into the mechanical behavior of nanocrystalline Ni films under mechanical loading.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"73 ","pages":"Article 108233"},"PeriodicalIF":4.4,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmed R. Galaly , Tahani R. Aldhafeeri , Sameh M. Elghnam , Mahmoud A. Hamad
{"title":"Validity of the phenomenological model for magnetocaloric effects in MnFeP2/3Si1/3","authors":"Ahmed R. Galaly , Tahani R. Aldhafeeri , Sameh M. Elghnam , Mahmoud A. Hamad","doi":"10.1016/j.rinp.2025.108231","DOIUrl":"10.1016/j.rinp.2025.108231","url":null,"abstract":"<div><div>Assessing the validity of the phenomenological model (PM) for the magnetocaloric effect (MCE) in MnFeP<sub>2/3</sub>Si<sub>1/3</sub> is the aim of this study. Our work confirms PM for conventional MCE by simulating the MCE of MnFeP<sub>2/3</sub>Si<sub>1/3</sub> at temperatures between 230 K and 310 K. Interestingly, there is a good degree of precision across the whole temperature range in the agreement between the simulated magnetic entropy change (10.1 J/kg.K) and the reported one. Additionally, MnFeP<sub>2/3</sub>Si<sub>1/3</sub>′s relative cooling power is evaluated to be 97 J/kg, and heat capacity change characterization is investigated. By reducing the time and effort required to calculate and measure MCE, these results imply that PM is a trustworthy model for investigating MCE in the sharp magnetic transition. Consequently, the PM is very useful for estimating the MCE of magnets, as the MnFeP<sub>2/3</sub>Si<sub>1/3</sub> sample has a sharp magnetic transition. Consequently, we believe that the PM can also be used for predicting MCE parameters for any magnetic transition.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"73 ","pages":"Article 108231"},"PeriodicalIF":4.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Monireh Jafari , Mohammad Mahdi Shahidi , Mohammad Hossein Ehsani
{"title":"Optimization of WS2 layer thickness for enhanced performance in self-powered gas sensors","authors":"Monireh Jafari , Mohammad Mahdi Shahidi , Mohammad Hossein Ehsani","doi":"10.1016/j.rinp.2025.108232","DOIUrl":"10.1016/j.rinp.2025.108232","url":null,"abstract":"<div><div>The WS<sub>2</sub> thin films were deposited on glass substrates using RF magnetron sputtering using a tungsten sulfide target to study the effect of WS<sub>2</sub> layer thickness on the properties of the thin films. To analyze the morphological, structural, optical, electrical, and gas sensor characteristics of the thin films. The FESEM images indicated that samples have nanoparticles with 50, 150, and 250 nm thicknesses. The 50 and 250 nm and the sample of 150 nm have preferred orientations of (104) and (009), respectively. The 150 nm sample has a larger crystallite size than the other two samples and, as a result, has better crystallinity. Additionally, the Urbach energy calculation showed that the 150 nm sample had the lowest Urbach energy (74 meV), confirming better crystallinity and fewer crystal defects. The indirect band gap of the samples with increasing thickness is 1.89, 1.35, and 1.55 eV, respectively, which indicates that the 150 nm sample has the closest band gap value to the bulk state. Among the samples, the sample of 150 nm, which has better crystallinity and fewer crystal defects, has responded to the gas sensing of ethanol and ammonia in the self-powered mode. Measurements were performed at 500, 1500, and 2000 ppm and the recovery time for ethanol gas was 41.28 s.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"73 ","pages":"Article 108232"},"PeriodicalIF":4.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigating rheological characteristics of nonlinear fluid model in a curved channel with corrugated permeable walls under convective constraints","authors":"M. Mujahid, Z. Abbas, M.Y. Rafiq","doi":"10.1016/j.rinp.2025.108234","DOIUrl":"10.1016/j.rinp.2025.108234","url":null,"abstract":"<div><div>This study presents a comprehensive analysis of the pressure-driven flow dynamics of magnetized Ree-Eyring fluid through a permeable corrugated curved channel under convective constraints. The intricate geometry of the channel is precisely formulated using an orthogonal curvilinear coordinate system, ensuring an accurate representation of the complex structure. The corrugations along the channel walls are mathematically modeled using sinusoidal functions, incorporating a well-defined phase difference to depict the wavy nature of the boundaries. To facilitate analytical treatment, the initially complex boundary layer equations, formulated as a system of partial differential equations, are efficiently transformed into a solvable set of ordinary differential equations using the perturbation method. This approach enables the derivation of an exact solution for velocity, temperature distribution, and volumetric flow rate, with the corrugation amplitude serving as the perturbation parameter. Key parameter effects are vividly illustrated through detailed graphical representations. Furthermore, the skin friction coefficient and local Nusselt number are computed using advanced numerical techniques, with results systematically presented in a comprehensive tabular format across a wide range of parametric values. The study has diverse applications, particularly in biomedical engineering for simulating arterial blood flow and designing stents. It also benefits industrial heat exchangers, microfluidic devices, magnetohydrodynamics systems, and aerospace cooling technologies. The findings contribute valuable insights into fluid mechanics, optimizing flow, and heat transfer in various engineering and scientific applications.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108234"},"PeriodicalIF":4.4,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abdullah , Babar Kamal , Sadiq Ullah , Ashfaq Ahmad , Dong-you Choi
{"title":"Dual-band cross-polarization and linear-to-circular polarization converting metasurface","authors":"Abdullah , Babar Kamal , Sadiq Ullah , Ashfaq Ahmad , Dong-you Choi","doi":"10.1016/j.rinp.2025.108222","DOIUrl":"10.1016/j.rinp.2025.108222","url":null,"abstract":"<div><div>A dual-band multifunctional polarization converting metasurface (PCMS) for linear-to-linear polarization conversion (LTLPC) and linear-to-circular polarization conversion (LTCPC) is presented in this paper. The PCMS converts LP incident waves into their orthogonal waves in dual frequency bands of 7.5–12 GHz with fractional bandwidth (FBW) of 46.15%, and 15.4–20.16 GHz with FBW of 26.77%, with a polarization conversion ratio (PCR) of 98%. Furthermore, the PCMS converts LP wave to circular polarized wave with axial ratio (AR), below 3 dB in the frequency range of 12–15.4 GHz with a FBW of 24.81%. To comprehend the designed MS operational principle the surface current distributions (SCD) are also discussed on numerous resonance frequencies. A prototype of the designed MS is fabricated, the simulated and measured results are in good agreement. The dual frequency bands and multifunctional PC characteristics of the MS make it useful for a wide range of microwave communication and radar systems.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"73 ","pages":"Article 108222"},"PeriodicalIF":4.4,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yu-Jing Yang , De-Long Zhang , Sai-Dong Xue , Ning Yuan
{"title":"Efficient fiber-chip coupler based on photonic jet","authors":"Yu-Jing Yang , De-Long Zhang , Sai-Dong Xue , Ning Yuan","doi":"10.1016/j.rinp.2025.108241","DOIUrl":"10.1016/j.rinp.2025.108241","url":null,"abstract":"<div><div>We report an efficient fiber-chip coupler based on photonic jet (PJ) and operated at 1.55 µm wavelength. The coupler is composed of a micron-sized cone embedded in a SiO<sub>2</sub> cuboid. The device is modeled and the modeling focuses on its coupling performance. The results show that, by aid of the coupler, the coupling efficiency between a single-mode fiber and an on-chip photonic wire (PW) based on LiNbO<sub>3</sub>-on-insulator (LNOI) can be promoted from 10 % to 77 %. The significant promotion of coupling efficiency is related to the substantial mode field compression produced in the PJ formation. Further study shows that the device has a large working bandwidth of 1500–1650 nm for coupling efficiency >75 %, a Fresnel reflection loss of 0.86 dB, a good fabrication tolerance and an acceptable alignment tolerance. The efficient coupling can be also realized for the LNOI PW with other geometries and types. The device is also applicable to on-chip PW based on other platforms, such as SOI and Si<sub>3</sub>N<sub>4</sub>.</div></div>","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"73 ","pages":"Article 108241"},"PeriodicalIF":4.4,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xia Liu , Baraa Abd Alreda , Jalil Manafian , Baharak Eslami , Mehdi Fazli Aghdaei , Mostafa Abotaleb , Ammar Kadi
{"title":"Retraction notice to “Computational modeling of wave propagation in plasma physics over the Gilson–Pickering equation” [Res. Phys. 50 (2023) 106579]","authors":"Xia Liu , Baraa Abd Alreda , Jalil Manafian , Baharak Eslami , Mehdi Fazli Aghdaei , Mostafa Abotaleb , Ammar Kadi","doi":"10.1016/j.rinp.2025.108221","DOIUrl":"10.1016/j.rinp.2025.108221","url":null,"abstract":"","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108221"},"PeriodicalIF":4.4,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Emad H.M. Zahran , Hijaz Ahmad , Sameh Askar , Dilber Uzun Ozsahin
{"title":"Retraction notice to “New impressive performances for the analytical solutions to the (1+1)-dimensional van der-waals gas system against its numerical solutions” [Res. Phys. 51 (2023) 106667]","authors":"Emad H.M. Zahran , Hijaz Ahmad , Sameh Askar , Dilber Uzun Ozsahin","doi":"10.1016/j.rinp.2025.108220","DOIUrl":"10.1016/j.rinp.2025.108220","url":null,"abstract":"","PeriodicalId":21042,"journal":{"name":"Results in Physics","volume":"72 ","pages":"Article 108220"},"PeriodicalIF":4.4,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}