Physica Scripta最新文献_第9页

Isothermal magnetization and magnetoresistive variations in trilayer (La2/3Sr1/3MnO3/γ-Fe2O3/La2/3Sr1/3MnO3) hetero-structure 三层（La2/3Sr1/3MnO3/γ-Fe2O3/La2/3Sr1/3MnO3）异质结构中的等温磁化和磁阻变化

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6647

Pooja Narwat, Ashutosh Mishra

{"title":"Isothermal magnetization and magnetoresistive variations in trilayer (La2/3Sr1/3MnO3/γ-Fe2O3/La2/3Sr1/3MnO3) hetero-structure","authors":"Pooja Narwat, Ashutosh Mishra","doi":"10.1088/1402-4896/ad6647","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6647","url":null,"abstract":"\u0000 We report the field dependent magnetic and magnetoresistance (MR) properties of La2/3Sr1/3MnO3 (LSMO)/γ-Fe2O3/LSMO trilayer heterostructures and single layer LSMO film grown on SiO2/Si (100) substrates utilizing Pulsed Laser Deposition technique. The metal- insulator-metal configuration is a magnetic tunnel junction topology, which is a parallel network of two metallic layers (LSMO) and one insulating layer (γ-Fe2O3) in current-in-plane (CIP) geometry. The intrinsically inhomogeneous polycrystalline trilayer film shows much lower (almost half) coercivity, compared to single layer LSMO film. The MR-H [MR = (ρ (H)-ρ (0))/ρ (0)] behavior of the films is studied under two regimes namely, Low Field Magnetoresistance (LFMR) and High Field Magnetoresistance (HFMR) at 5 K and 300 K in the field range of 0-7 T. Several equations were developed to simulate the experimental MR-H data of the studied samples. For both the films, in the LFMR region (0 T <H ≤ 1 T @ 5 K), the variation in MR exhibits a linear increase with H, followed by a logarithmic behavior in the HFMR region (1 T < H ≤ 7 T @5 K). For the trilayer film in CIP geometry, a negative MR of 16% is achieved at 5 K and 1 T field conditions, while LSMO single layer shows a negative MR of 13% at same temperature and field conditions. The MR obtained at high field (7 T) for both the films is quantitatively equal with a value of 38% @5 K and 15% @300 K. We obtained significantly better MR-H results for the trilayer in current-perpendicular-to-plane (CPP) configuration, where the two metallic layers and an insulating layer are in series. In the CPP configuration, MR is 21% @5 K and 1 T field, while it reached to 44% at 5 K and 7 T field. At room temperature, the trilayer heterostructure shows MR of 17% at 7 T field condition. At a higher field of 9 T, trilayer film in CPP mode exhibits MR value of 48% @5 K and 23%@300 K. Further, the anti-parallel and parallel magnetization states of the MIM device are well manifested in CIP and CPP geometries.\u0000","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"16 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multilevel dynamics of matter waves scattering in finite potential wells 有限势阱中物质波散射的多级动力学

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad664b

Miguel Ángel Mandujano, J. Villavicencio, R. Romo

{"title":"Multilevel dynamics of matter waves scattering in finite potential wells","authors":"Miguel Ángel Mandujano, J. Villavicencio, R. Romo","doi":"10.1088/1402-4896/ad664b","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664b","url":null,"abstract":"\u0000 We explore the dynamics of matter wave scattering in finite potential wells using analytical solutions of the Schr\"odinger equation within the framework of a quantum shutter model. We find that the incident wave interferes with the bound states of the quantum well, resulting in time-domain oscillations. These oscillations exhibit Rabi-type frequencies, characterised by the energy differences between the incident wave and the bound states of the quantum well. We show that in systems with double-bound states, the interference pattern is characterised by quantum beats in the time-dependent probability density. The period of these beatings depends on the energy difference between the bound states, which can be tuned by controlling the potential parameters. In the general case where bound, anti-bound, and resonant states coexist in the system spectrum, complex oscillations in the probability density arise from the interactions of the incident wave with different quantum states. We demonstrate that the bound states sector can effectively describe this complex behaviour, providing a simple and reliable analytical expression for the probability density in multilevel systems. This formula highlights the significant role of bound states, whose interaction with the incident wave dominates the transient probability density. This contrasts with conventional systems with potential barriers and wells, where resonances govern the wave dynamics.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"37 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full quantum eigensolvers based on variance 基于方差的全量子求解器

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad664c

Ruo-Nan Li, Yuanhong Tao, Jin‐Min Liang, Shuhui Wu, Shao-Ming Fei

{"title":"Full quantum eigensolvers based on variance","authors":"Ruo-Nan Li, Yuanhong Tao, Jin‐Min Liang, Shuhui Wu, Shao-Ming Fei","doi":"10.1088/1402-4896/ad664c","DOIUrl":"https://doi.org/10.1088/1402-4896/ad664c","url":null,"abstract":"\u0000 The advancement of quantum computation paves a novel way for addressing the issue of eigenstates. In this paper, two full quantum eigenvalue solvers based on quantum gradient descent are put forward. Compared to the existing classical-quantum hybrid approaches such as the variance-variational quantum eigenvalue solver, our method enables faster convergent computations on quantum computers without the participation of classical algorithms. As any eigenstate of a Hamiltonian has zero variance, this paper takes the variance as the objective function and utilizes the quantum gradient descent method to optimize it, demonstrating the optimization of the objective function on the quantum simulator. With the swift progress of quantum computing hardware, the two variance full quantum eigensolvers proposed in this paper are anticipated to be implemented on quantum computers, thereby offering an efficient and potent calculation approach for solving eigenstate problems. Employing this algorithm, we showcase 2 qubits of deuterium and hydrogen molecule. Furthermore, we numerically investigate the energy and variance of the Ising model in larger systems, including 3, 4, 5, 6, and 10 qubits.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"24 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141815669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Complex partition function of 1-dimensional Dirac particle conﬁned in Woods-Saxon interaction 伍兹-撒克逊相互作用中包含的一维狄拉克粒子的复分配函数

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6649

Taofiq Toyin Ibrahim, E. O. Oladimeji, D. J. Koffa, Helen Edogbanya, M. M. Gwani, J. F. Omonile

引用次数: 0

Repercussion of Fiber Content on the Mechanical, Thermal, and Thermomechanical Properties of Natural Fibers Reinforced Thermoplastic Composites for Automotive Application 纤维含量对汽车用天然纤维增强热塑性复合材料的机械、热和热机械性能的影响

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6644

Mufaddal Huzefa Shakir, A. Singh, Siddhartha Sharma

{"title":"Repercussion of Fiber Content on the Mechanical, Thermal, and Thermomechanical Properties of Natural Fibers Reinforced Thermoplastic Composites for Automotive Application","authors":"Mufaddal Huzefa Shakir, A. Singh, Siddhartha Sharma","doi":"10.1088/1402-4896/ad6644","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6644","url":null,"abstract":"\u0000 Natural fibers are becoming very popular as a reinforcement in composite materials owing to their benefits, such as low-price, lightweight, availability, and environmental friendliness. In this study, abaca fiber-reinforced polypropylene (PP) and high-density polyethylene (HDPE) composites were created with the help of the injection molding method. Prior to composite fabrication, abaca fibers were chemically treated with a 5 wt.% caustic soda (NaOH) solution to improve the bonding between the abaca fibers and the matrix and to enhance their properties. Scanning electron microscopy (SEM) was utilized to assess the fiber surface microstructures before as well as after the chemical treatment, along with the fractured surfaces of tensile specimens. The mechanical properties, such as tensile, bending, and impact strength, of abaca/PP and abaca/HDPE composites were evaluated and compared. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) methods were utilized to investigate the thermal behaviour of composites. Also, the dynamic mechanical analysis (DMA) method was utilized to explore the thermomechanical properties of the fabricated composites. The outcomes of the experimental findings showed that abaca/PP composite with 10 and 20 wt.% fibers is the best choice of material to be used in the automobile industry.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"13 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First-principles quantum analysis of structural, optoelectronic, and thermophysical properties of Co/Ni doped ceria Ce1-xTmxO2 (Tm= Co, Ni) for solar cell applications 用于太阳能电池的 Co/Ni 掺杂铈 Ce1-xTmxO2（Tm= Co、Ni）结构、光电和热物理特性的第一原理量子分析

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6641

Shafaat Hussain Mirza, Z. Abbas, Amna Parveen, Shoyebmohamad F. Shaikh

{"title":"First-principles quantum analysis of structural, optoelectronic, and thermophysical properties of Co/Ni doped ceria Ce1-xTmxO2 (Tm= Co, Ni) for solar cell applications","authors":"Shafaat Hussain Mirza, Z. Abbas, Amna Parveen, Shoyebmohamad F. Shaikh","doi":"10.1088/1402-4896/ad6641","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6641","url":null,"abstract":"\u0000 The properties of CeO2 thin films, such as their memory store capabilities, visual transparency, chemical and thermal durability, adjustable energy band topologies, and high oxygen storage capacity have captured the attention of scientists. The energy band dispersions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are calculated to get insight into the characteristics of the materials under investigation. The anticipated energy bandgaps for Ce1-xCoxO2 and Ce1-xNixO2 are 2.6 and 2.7 eV, respectively, in the spin ↑ channel . However, both compounds show metallic character in in spin ↓ channel. The phenomena of photon absorption/dispersion by the host materials can be elucidated using dielectric function ε(ω) of Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%). Significant photon absorption can be noted in UV and IR regions for Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) in spin ↑ and spin ↓ channels, respectively. Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) exhibits a minimal photon reflection, approximately 15%. Ce1-xNixO2 shows excellent thermoelectric characteristics as its ZT value is high (1.8 at 1000K) compared to Ce1-xCoxO2. Based on their thermodynamic properties, Ce1-xTmxO2 (Tm= Co, Ni; x= 12.5%) are thermodynamically stable compounds.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"28 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle 基于光磁组合结构测量绝对角度的高精度编码器研究

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6646

Tai Zhao, Quanbing Zhang, Hao Tian, Yikang Jiang

{"title":"Research on high-precision encoder based on optical-magnetic combination structure to measure absolute angle","authors":"Tai Zhao, Quanbing Zhang, Hao Tian, Yikang Jiang","doi":"10.1088/1402-4896/ad6646","DOIUrl":"https://doi.org/10.1088/1402-4896/ad6646","url":null,"abstract":"\u0000 As a kind of sensor for real-time feedback and dynamic monitoring of angular velocity and angular displacement of the system, the common photoelectric encoder is widely used in many fields such as new energy electric vehicles, servo closed-loop control systems, industrial control, security monitoring. In order to improve the resolution and accuracy, a kind of optical and magnetic combined encoder which combines photoelectricity and multi-pole magnetoelectricity is designed in this paper, where the light-blocking disk of photoelectric sensor is designed according to the pseudo-random sequence, and the photoelectric coding is used to determine the magnetic interval of multi-pole. The absolute angle is calculated according to the number of multiple circles plus the angle of single circle. The experimental results at different temperatures (−40 C~100 C) show that the accuracy of the proposed combined encoder can reach ±0.08°, which is improved by 0.37° compared with that of the single-pole encoder. Finally, the combined encoder was applied to the pan-tilt-zoom (PTZ) camera of a video surveillance enterprise, and the experiment showed that its repeated positioning accuracy reached ±0.02°, which is greatly improved compared with single-pole encoder.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"15 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141814781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solution of state transfer matrix based on DNA strand displacement circuits 基于 DNA 链位移电路的状态转移矩阵解法

Physica Scripta Pub Date : 2024-07-22 DOI: 10.1088/1402-4896/ad6640

Dan Ling, Hao Su, Ce Sun, Junwei Sun, Yanfeng Wang

引用次数: 0

Effect of graphite concentration on the electrochemical performance of a novel α-MnO2-expanded graphite-PVDF composite cathode material based on FTO substrate 石墨浓度对基于 FTO 基底的新型 α-MnO2- 扩展石墨-PVDF 复合阴极材料电化学性能的影响

Physica Scripta Pub Date : 2024-07-19 DOI: 10.1088/1402-4896/ad65c4

A. Philip, A. Ruban Kumar

{"title":"Effect of graphite concentration on the electrochemical performance of a novel α-MnO2-expanded graphite-PVDF composite cathode material based on FTO substrate","authors":"A. Philip, A. Ruban Kumar","doi":"10.1088/1402-4896/ad65c4","DOIUrl":"https://doi.org/10.1088/1402-4896/ad65c4","url":null,"abstract":"\u0000 A facile chemical reduction method is employed for the synthesis of α-MnO2 followed by ultrasonication with synthetic graphite and poly (vinylidene pyrrolidone) PVDF for the development of α-MnO2-expanded graphite-PVDF (MGP) composite. Known masses of MGP composite are drop-casted on a fluorine-doped tin oxide (FTO) conducting glass substrate for the fabrication of composite electrodes to use as the cathode. The compositional effects of various weight percentages of graphite on the electrochemical performance of the MGP composite are studied. The increase in graphite’s weight percentage is always accompanied by an equal reduction in the weight of MnO2 by maintaining a constant amount of PVDF. We demonstrate a maximum electrochemical performance for the composite containing 80% MnO2, 10% expanded graphite, and 10% PVDF, further increases in graphite concentration (reduction in that of MnO2) have detrimental effects on the performance. The basis characterisation of the composite is carried out using XRD, FTIR, UV-VIS, AFM, and SEM and the electrochemical studies are done using CV, GCD and EIS. We observe both faradaic and non-faradaic charge storage mechanisms in the composite samples with a 35% capacitive contribution and a 65% diffusive contribution to the total capacitance. Moreover, the composite electrode demonstrates a maximum specific capacitance of 358 F/g at 10 mV/s with an outstanding power density of 2.8 KW/Kg.","PeriodicalId":503429,"journal":{"name":"Physica Scripta","volume":"122 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141822158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transition metal centers with anharmonic elastic interactions in one-dimensional spin-crossover solids 一维自旋交叉固体中具有非谐波弹性相互作用的过渡金属中心

Physica Scripta Pub Date : 2024-07-19 DOI: 10.1088/1402-4896/ad65c2

A. Metatla, W. Nicolazzi, H. Latelli, A. Bousseksou

引用次数: 0