Modern Physics Letters B最新文献

{"title":"Structure and anisotropic magnetoresistance of sol–gel spin coating synthesized La0.67Ca0.33MnO ₃ films on various substrates","authors":"Yingjuan Li, Chao Wang, Hao Duan, Ziao Gong, Zhiyuan Yang, Qianxu Ye, B.Y. Hou, Sheng’an Yang, Qingming Chen","doi":"10.1142/s0217984925502471","DOIUrl":"https://doi.org/10.1142/s0217984925502471","url":null,"abstract":"Perovskite manganese oxides, as strongly correlated systems, exhibit a rich interplay of competing metallic and insulating phases that give rise to diverse physical properties, including anisotropic magnetoresistance (AMR), ferromagnetism, and ferroelectricity. This unique behavior has made these materials a subject of intense research in recent years. However, the practical application of manganese oxide-based AMR devices faces significant challenges, such as limited accuracy under low magnetic fields, operational temperatures far from room temperature, and a high preparation threshold, which collectively restrict their viability for angle sensor technologies. In this study, we fabricated La[Formula: see text]Ca[Formula: see text]MnO 3 (LCMO) films on four distinct substrates — LaAlO 3 (LAO), NdGaO 3 (NGO), (LaAlO[Formula: see text](SrAlTaO[Formula: see text] (LSAT), and SrTiO 3 (STO) — using a sol–gel spin coating technique. The wet films were rapidly sintered at [Formula: see text]C in a tubular furnace, yielding LCMO/LAO, LCMO/NGO, LCMO/LSAT, and LCMO/STO samples. We systematically investigated the impact of substrate choice on the structural, morphological, and magnetotransport properties of the films. Among the samples, the LCMO/LAO film demonstrated exceptional magnetoresistive performance, achieving a magnetoresistance (MR) of 63.6% at 273[Formula: see text]K. Furthermore, by optimizing interfacial strain, we enhanced the AMR performance of LCMO/NGO films to [Formula: see text]28.7%. These findings not only advance the understanding of strain-mediated MR in perovskite manganites but also pave the way for the application of La[Formula: see text]Ca x MnO 3 thin films in directional magnetic sensors, significantly broadening their potential for room–temperature device integration.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"40 07","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147908353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Current-carrying tribological behavior and wear mechanism of silver-based composite coatings: Incorporating nanosized Ag particles into lubricant","authors":"Jiamin Fang, Yuting Liu, Jing Sang, Hidetoshi Hirahara, Sumio Aisawa, Zhixin Kang, Wei Li, Dexin Chen","doi":"10.1142/s0217984925502021","DOIUrl":"https://doi.org/10.1142/s0217984925502021","url":null,"abstract":"The application of conductive lubricants into the friction interface has emerged as a common and efficient approach to improve the current-carrying tribological behavior and wear characteristics on the metallic surface. This work incorporates 0.1[Formula: see text]wt.% nano-sized Ag particles as conductive fillers in lubricant and investigates the current-carrying tribological behavior of silver-based composite coatings through reciprocating sliding friction experiments. The wear mechanisms of the composite coatings are analyzed under different conditions, including varying lubricants, high loads, and high currents. The experimental results indicate that under lubrication, wear characteristics are dominated by mechanical friction and wear, with arc erosion occurring when the current reaches 20[Formula: see text]A. Furthermore, a wear severity progressively increases with higher currents when the load reaches 20[Formula: see text]N. The introduced Ag particles effectively diminish contact resistance at the current-carrying friction interface, and mitigating the wear severity of composite coatings, the wear volume decreased by about 18.9% under the same conditions. The wear behavior exhibits distinct patterns depending on the applied load and current conditions. Analysis of the mechanical properties of subsurface and the chemical composition of wear tracks surface. The mechanical properties reveal that the maximum surface nanohardness reaches 2.1[Formula: see text]GPa, while the maximum increase of subsurface nanohardness caused by current and load is 12.8% and 10.5%, respectively, and the degree of current-induced work hardening is more pronounced. Additionally, excessive loads and currents lead to interfacial heat generation, causing contact instability, friction pair separation, discharge events, and accelerated electrical damage and material transfer. The findings of this study provide important theoretical support and technical guidance for the surface protection of solid materials against current-carrying friction and wear in critical electrical equipment components.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"39 32","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147901399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"A new method for low-temperature preparation of graphene-reinforced copper-based composites with excellent mechanical and electrical properties","authors":"Zeli Deng, Weida Chen, Lingjie Zhou, Zhi Li, Guanghong Liu, Dongyang Jiang, Yuxian Duan, Jinming Cai, Jun Chang, Ziyang Wang, Hongyou Li, Qianxu Ye","doi":"10.1142/s0217984925501982","DOIUrl":"https://doi.org/10.1142/s0217984925501982","url":null,"abstract":"The in-situ growth of graphene on the surface of copper powder is an ideal process for preparing high-performance copper-based composites. However, high graphene growth temperature reduces the specific surface area of the copper powder and hinders graphene content. To tackle these challenges, this paper proposes utilizing the high surface energy and gas permeability of nano-sized porous copper powder for low-temperature graphene growth. The process involves transforming micron-sized solid Cu 2 (OH) 2 CO 3 powder into 100–200[Formula: see text]nm porous copper powder at 300 ∘ C. Following this, a plasma-enhanced chemical vapor deposition method deposits carbon atoms from acetylene (C 2 H[Formula: see text] onto the porous copper powder at 300 ∘ C to 500 ∘ C, forming 2–5 layer in-situ graphene films. After hot isostatic pressing, the graphene film is torn into strips, creating a graphene-copper composite bulk material. The Cu/Gr-500 composite shows a 2.42% decrease in electrical conductivity and a 1.6% decrease in elongation, while yield strength and tensile strength improve by 40.7% and 19.0%, reaching 295.8 and 322.29[Formula: see text]MPa, respectively. This research offers a new method for low-temperature in-situ growth of graphene on metal surfaces and low-cost fabrication of high-performance metal composites.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"39 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147918739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Diatomic site high-entropy engineering boosts thermal properties of RETaO₄ for TBC applications","authors":"Hao Xu, Lin Chen, Jiang Tian, Baihui Li, Luyang Zhang, Jiankun Wang, Jing Feng","doi":"10.1142/s0217984925501842","DOIUrl":"https://doi.org/10.1142/s0217984925501842","url":null,"abstract":"High-entropy ceramics (HECs) are widely studied to boost the properties of various materials, based on the high-entropy effects and high disorders in ionic radius and atomic weights. To further optimize the properties of RETaO 4 (RE is rare-earth) as thermal barrier coatings (TBCs), a diatomic site high-entropy engineering is applied to increase their disorders, subsequently boosting their thermophysical properties. Four RETaO 4 HECs are designed and synthesized in this work, including (Gd[Formula: see text]Dy[Formula: see text]Ho[Formula: see text]Er[Formula: see text]Y[Formula: see text](Ta[Formula: see text]Nb[Formula: see text]O 4 , (5HECs-1), (Gd[Formula: see text]Dy[Formula: see text]Ho[Formula: see text]Er[Formula: see text]Yb[Formula: see text](Ta[Formula: see text]Nb[Formula: see text]O 4 , (5HECs-2), (Gd[Formula: see text]Dy[Formula: see text]Ho[Formula: see text]Er[Formula: see text]Yb[Formula: see text]Y[Formula: see text](Ta[Formula: see text]Nb[Formula: see text]O 4 , (6HECs-1), and (Gd[Formula: see text]Dy[Formula: see text]Ho[Formula: see text]Er[Formula: see text]Yb[Formula: see text]Lu[Formula: see text](Ta[Formula: see text]Nb[Formula: see text]O 4 , (6HECs-2). It shows that the thermal conductivity (1.41–1.59 W[Formula: see text]m[Formula: see text]K[Formula: see text], [Formula: see text]C) is reduced, while thermal expansion coefficients are improved ([Formula: see text]–[Formula: see text] [Formula: see text]K[Formula: see text] at [Formula: see text]C), which are better than their single-RE ceramics. Furthermore, Young’s modulus is proportional to their A-site ionic radius, and RETaO 4 HECs have higher modulus than single-RE RETaO 4 and RENbO 4 ceramics. Accordingly, the diatomic site high-entropy engineering is effective in boosting the thermophysical properties of RETaO 4 , and this strategy can be tried in various oxide ceramics.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"39 32","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147900293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Synthesis and single near-infrared upconversion luminescence of a novel Yb3+/Er3+ co-doped CaY₂O₄ phosphor","authors":"Yongqiang Li, Chang‐Chun Ding, Yuxiang Wu, Bin Duan, Rangrang Fan, Fengyi Wang, Tong Liu, Wei Jin, Junshan Hu","doi":"10.1142/s0217984925501775","DOIUrl":"https://doi.org/10.1142/s0217984925501775","url":null,"abstract":"In this work, a single near-infrared (NIR) upconversion phosphor of Yb[Formula: see text]/Er[Formula: see text] co-doped CaY 2 O 4 was prepared using an equivalent substitution strategy. The CaY 2 O 4 structure features a (R 2 O 4 ) 2 -framework of double octahedra, with rare earth ions located within the framework. When irradiated with a 980[Formula: see text]nm near-infrared (NIR) laser, the phosphor emits 829[Formula: see text]nm NIR light. The main excitation mechanism of the NIR emission was explained by the characterization of power dependence, absorption spectrum, and down shift-conversion spectra. The energy transfer (ET) process is the promotion of Er[Formula: see text] ions from the 4 I[Formula: see text] energy level to the 4 F[Formula: see text] energy level, and finally relax to 4 I[Formula: see text] energy level. The phosphor has potential application value in the biomedical field and bio-imaging due to its emission of NIR upconversion luminescence.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"39 30","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Chemical response in Oldroyd-B liquid through rotational disk with temperature and space-related heat rise","authors":"M. Rupa Lavanya, Kotha Gangadhar, D. Naga Bhargavi, Ali J. Chamkha","doi":"10.1142/s0217984925501465","DOIUrl":"https://doi.org/10.1142/s0217984925501465","url":null,"abstract":"This paper considered the magnetized flow of an Oldroyd-B fluid over a rotational disk. In this investigation, the altered Fourier’s law rather than the classic Fourier’s law of consideration was used by the fluid thermal features. Its effect on homogeneous–heterogeneous reactions about mass transport was studied. Additionally, interesting characteristics of thermal radiation with temperature and space-related heat sources or sinks were examined. The von Karman variables were utilized to discipline the PDEs toward non-dimensional ODEs. An efficient finite element method was utilized in acquiring the numerical results. The correlation table was invented in an indentured case to save the efficacy of their numerical outcomes in the previous results. It was noticed that the fluid velocity decreases to make an effect on the relaxation time parameter. The thermal distribution on Oldroyd-B fluid displays the diminishing trend on acceleration on the range of thermal relaxation heat flux parameter. Further, higher values of heat generation parameter decline the rate of heat transfer. Furthermore, the absorption rate of the fluid deteriorates a greater strength of the homogeneous reaction.","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"39 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147913358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Analysis of optical solitons propagation in the dual-mode resonant nonlinear Schrödinger dynamical equation with assorted nonlinear interactions","authors":"Hamood Ur Rehman, Kiran Khushi, Ifrah Iqbal, El-Sayed M. Sherif, M. Umair Shahzad, Mohammad Amir Khan","doi":"10.1142/s0217984924504335","DOIUrl":"https://doi.org/10.1142/s0217984924504335","url":null,"abstract":"<p>This research explores the dual-mode manifestation within the nonlinear Schrödinger equation, elucidating the amplification or absorption of paired waves. This study delves into the simultaneous generation of two distinct waves associated with the dual-mode phenomenon with three crucial parameters: phase velocity, nonlinearity and dispersive factor. The resulting wave phenomena from these solutions have implications across various fields, including fluid dynamics, water wave mechanics, ocean engineering and scientific inquiry. The study employs the modified Sardar sub-equation method to obtain the optical soliton solutions, encompassing various types such as dark, bright, singular, combo dark–singular, periodic singular and dark–bright solitons. The obtained results highlight the reliability and simplicity of the modified Sardar sub-equation method. Additionally, the paper delves into the parametric conditions crucial for shaping and sustaining these solitons. The research explores the interaction of dual waves and the variation in wave speed. Furthermore, dynamic phenomena are illustrated, and the physical implications of the solutions are interpreted using 3D and 2D plots with different parameter values.</p>","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"111 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Design of NiO–ZnCo2O4 heterostructures for room temperature H2S sensing","authors":"Ali Akhtar, Rujun Zhou, Daru Chen, Shama Sadaf, Ce Fu, Jianqiao Liu","doi":"10.1142/s0217984924504098","DOIUrl":"https://doi.org/10.1142/s0217984924504098","url":null,"abstract":"<p>Hydrogen sulfide (H₂S) detection with novel sensing properties such as higher response and minimum detection limit at room temperature is essential to ensure the safety of humans and the environment. A hydrothermal method was utilized to synthesize NiO–ZnCo₂O₄ heterostructures. The purpose of these materials was to fabricate gas sensors and detect different hazardous gases. The intrinsic properties of synthesized products were studied to check the microstructure and morphological properties of the heterostructures. Different gas sensors performed gas sensing properties, and the significant properties such as high response (ratio of response in gas and response in air <span><math altimg=\"eq-00002.gif\" display=\"inline\"><msub><mrow><mi>R</mi></mrow><mrow><mi>g</mi></mrow></msub><mo stretchy=\"false\">∕</mo><msub><mrow><mi>R</mi></mrow><mrow><mi>a</mi></mrow></msub><mo>=</mo><mn>2</mn><mn>9</mn><mn>0</mn></math></span><span></span>) towards 20<span><math altimg=\"eq-00003.gif\" display=\"inline\"><mspace width=\".17em\"></mspace></math></span><span></span>ppm H₂S, short response/recovery time (32/20 s), a low detection limit (0.5 ppm), and great selectivity were detected based on the gas sensor of NZCO-5 (5% NiO–ZnCo₂O₄) compared with other sensors NiO, NZCO-0 (0% NiO–ZnCo₂O₄) and NZCO-10 (10% NiO–ZnCo₂O₄). The significant H₂S gas sensing improvement in this study could be a potential route for saving human lives.</p>","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"128 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Astrophysical expedition: Transit search heuristics for fractional Hammerstein control autoregressive models","authors":"Faisal Altaf, Ching-Lung Chang, Naveed Ishtiaq Chaudhary, Taimoor Ali Khan, Zeshan Aslam Khan, Chi-Min Shu, Muhammad Asif Zahoor Raja","doi":"10.1142/s0217984924504177","DOIUrl":"https://doi.org/10.1142/s0217984924504177","url":null,"abstract":"<p>This study presents an astrophysics-inspired transit search optimization (TSO) algorithm based on exoplanet search divided into five phases: galaxy phase, star phase, transit phase, neighbor phase and exploitation phase for effective parameter estimation of fractional Hammerstein control autoregressive (Fr-HCAR) systems. Various physical phenomena and real processes can be modeled with Fr-HCAR systems and estimating the Fr-HCAR parameters becomes a vital task. The mean-square error (MSE)-based criterion function is developed, and efficacy of the TSO for Fr-HCAR identification is deeply analyzed for different fractional orders, disturbance levels and degrees of freedom. The TSO remained accurate, convergent, robust and stable for all variations in Fr-HCAR but the accuracy level degrades a little bit for high disturbance and increased degrees of freedom. The reliability and trustworthiness of the TSO for Fr-HCAR identification are endorsed through statistical analyses conducted on sufficient autonomous executions of the scheme.</p>","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"16 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Synthesis of mulberry-like Fe nanoparticles assembly by nano-spheres and its excellent electromagnetic absorption properties","authors":"Fuli Yang, Bo Zou, Lirui Wang","doi":"10.1142/s021798492442003x","DOIUrl":"https://doi.org/10.1142/s021798492442003x","url":null,"abstract":"<p>Considering the development of ultra-wideband detection technology, the effective attenuation performance of conventional electromagnetic absorbing materials prepared by component-morphology method is still affected by narrowband, which hinders its application. An effective strategy is to develop nanomagnetic metal absorbent that can effectively overcome skin effect through fine control based on nanotechnology. Mulberry-like Fe nanoparticles based on the self-assembly of spheroid blocks were synthesized in a simple chemical reduction process supplemented by a magnetic field. In view of synergistic loss of magnetic metal Fe, and unique physical properties of nanoparticles, the mulberry-like Fe nanoparticles exhibited attractive wave-absorbing properties. At a thickness of 3<span><math altimg=\"eq-00001.gif\" display=\"inline\"><mspace width=\".17em\"></mspace></math></span><span></span>mm, the minimum reflection loss (RL) reaches −29.57<span><math altimg=\"eq-00002.gif\" display=\"inline\"><mspace width=\".17em\"></mspace></math></span><span></span>dB, and the bandwidth less than −10<span><math altimg=\"eq-00003.gif\" display=\"inline\"><mspace width=\".17em\"></mspace></math></span><span></span>dB reaches 8.38<span><math altimg=\"eq-00004.gif\" display=\"inline\"><mspace width=\".17em\"></mspace></math></span><span></span>GHz, which covers the entire X-band, most of the <i>C</i>-band and part of the Ku-band. This will make it possible for electromagnetic protection and electromagnetic stealth. A possible growth mechanism was proposed to provide theoretical guidance for the subsequent preparation of nanomagnetic metal absorbent.</p>","PeriodicalId":18570,"journal":{"name":"Modern Physics Letters B","volume":"8 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141254083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}