arXiv - PHYS - Applied Physics最新文献_第7页

Koopman analysis of combinatorial optimization problems with replica exchange Monte Carlo method 用复制交换蒙特卡洛法对组合优化问题进行库普曼分析

arXiv - PHYS - Applied Physics Pub Date : 2024-09-05 DOI: arxiv-2409.03154

Tatsuya Naoi, Tatsuya Kishimoto, Jun Ohkubo

引用次数: 0

Origin of the laser-induced picosecond spin current across magnetization compensation in ferrimagnetic GdCo 铁磁性钆钴中激光诱导的皮秒自旋电流跨磁化补偿的起源

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.03088

Guillermo Nava Antonio, Quentin Remy, Jun-Xiao Lin, Yann Le Guen, Dominik Hamara, Jude Compton-Stewart, Joseph Barker, Thomas Hauet, Michel Hehn, Stéphane Mangin, Chiara Ciccarelli

{"title":"Origin of the laser-induced picosecond spin current across magnetization compensation in ferrimagnetic GdCo","authors":"Guillermo Nava Antonio, Quentin Remy, Jun-Xiao Lin, Yann Le Guen, Dominik Hamara, Jude Compton-Stewart, Joseph Barker, Thomas Hauet, Michel Hehn, Stéphane Mangin, Chiara Ciccarelli","doi":"arxiv-2409.03088","DOIUrl":"https://doi.org/arxiv-2409.03088","url":null,"abstract":"The optical manipulation of magnetism enabled by rare earth-transition metal\u0000ferrimagnets holds the promise of ultrafast, energy efficient spintronic\u0000technologies. This work investigates laser-induced picosecond spin currents\u0000generated by ferrimagnetic GdCo via terahertz emission spectroscopy. A\u0000suppression of the THz emission and spin current is observed at magnetization\u0000compensation when varying the temperature or alloy composition in the presence\u0000of a magnetic field. It is demonstrated that this is due to the formation of\u0000domains in the GdCo equilibrium magnetic configuration. Without an applied\u0000magnetic field, the picosecond spin current persists at the compensation point.\u0000The experimental findings support the model for THz spin current generation\u0000based on transport of hot spin-polarized electrons, which is dominated by the\u0000Co sublattice at room temperature. Only at low temperature a comparable\u0000contribution from Gd is detected but with slower dynamics. Finally, spectral\u0000analysis reveals a blueshift of the THz emission related to the formation of\u0000magnetic domains close to magnetization compensation.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177804","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

Piezoresistive PtSe$_2$ pressure sensors with reliable high sensitivity and their integration into CMOS ASIC substrates 具有可靠高灵敏度的压阻 PtSe$_2$ 压力传感器及其与 CMOS ASIC 基底面的集成

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.03053

Sebastian Lukas, Nico Rademacher, Sofía Cruces, Michael Gross, Eva Desgué, Stefan Heiserer, Nikolas Dominik, Maximilian Prechtl, Oliver Hartwig, Cormac Ó Coileáin, Tanja Stimpel Lindner, Pierre Legagneux, Arto Rantala, Juha Matti Saari, Miika Soikkeli, Georg S. Duesberg, Max C. Lemme

{"title":"Piezoresistive PtSe$_2$ pressure sensors with reliable high sensitivity and their integration into CMOS ASIC substrates","authors":"Sebastian Lukas, Nico Rademacher, Sofía Cruces, Michael Gross, Eva Desgué, Stefan Heiserer, Nikolas Dominik, Maximilian Prechtl, Oliver Hartwig, Cormac Ó Coileáin, Tanja Stimpel Lindner, Pierre Legagneux, Arto Rantala, Juha Matti Saari, Miika Soikkeli, Georg S. Duesberg, Max C. Lemme","doi":"arxiv-2409.03053","DOIUrl":"https://doi.org/arxiv-2409.03053","url":null,"abstract":"Membrane-based sensors are an important market for microelectromechanical\u0000systems (MEMS). Two-dimensional (2D) materials, with their low mass, are\u0000excellent candidates for suspended membranes to provide high sensitivity, small\u0000footprint sensors. The present work demonstrates pressure sensors employing\u0000large-scale-synthesized 2D platinum diselenide (PtSe${_2}$) films as\u0000piezoresistive membranes supported only by a thin polymer layer. We investigate\u0000three different synthesis methods with contrasting growth parameters and\u0000establish a reliable high yield fabrication process for suspended\u0000PtSe${_2}$/PMMA membranes across sealed cavities. The pressure sensors\u0000reproducibly display sensitivities above 6 x 10${^4}$ kPa. We show that the\u0000sensitivity clearly depends on the membrane diameter and the piezoresistive\u0000gauge factor of the PtSe${_2}$ film. Reducing the total device size by\u0000decreasing the number of membranes within a device leads to a significant\u0000increase in the area-normalized sensitivity. This allows the manufacturing of\u0000pressure sensors with high sensitivity but a much smaller device footprint than\u0000the current state-of-the-art MEMS technology. We further integrate PtSe${_2}$\u0000pressure sensors with CMOS technology, improving the technological readiness of\u0000PtSe${_2}$-based MEMS and NEMS devices.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177808","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

Plasticity-induced crack closure identification during fatigue crack growth in AA2024-T3 by using high-resolution digital image correlation 利用高分辨率数字图像相关技术识别 AA2024-T3 疲劳裂纹生长过程中塑性诱发的裂纹闭合

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02560

Florian Paysan, David Melching, Eric Breibarth

{"title":"Plasticity-induced crack closure identification during fatigue crack growth in AA2024-T3 by using high-resolution digital image correlation","authors":"Florian Paysan, David Melching, Eric Breibarth","doi":"arxiv-2409.02560","DOIUrl":"https://doi.org/arxiv-2409.02560","url":null,"abstract":"Fatigue crack growth in ductile materials is primarily driven by the\u0000interaction between damaging and shielding mechanisms. In the Paris regime, the\u0000predominant mechanism for retardation is plasticity-induced crack closure\u0000(PICC). However, some of the mechanisms behind this phenomenon are still\u0000unclear. Identifying and separating the three-dimensional aspect from other\u0000shielding aspects during experiments is extremely complex. In this paper, we\u0000analyze the crack opening kinematics based on local crack opening displacement\u0000measurements in both 2D high-resolution digital image correlation data and 3D\u0000finite element simulations. The results confirm that the crack opening stress\u0000intensity factor Kop differs along the crack path. We present a new method to\u0000determine Kop at the crack front allowing us to identify PICC as the\u0000predominant shielding mechanism in fatigue crack growth experiments.\u0000Furthermore, this work contributes to the discussion on the damage-reducing\u0000effect of PICC, since we find that the influence on fatigue damage in the\u0000plastic zone remains negligible when the crack is closed and crack surface\u0000contact is directed towards the surface.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177807","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

Ventilated noise-insulating metamaterials inspired by sonic black holes 受声波黑洞启发的通风隔音超材料

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02731

Farid Bikmukhametov, Lana Glazko, Yaroslav Muravev, Dmitrii Pozdeev, Evgeni Vasiliev, Sergey Krasikov, Mariia Krasikova

{"title":"Ventilated noise-insulating metamaterials inspired by sonic black holes","authors":"Farid Bikmukhametov, Lana Glazko, Yaroslav Muravev, Dmitrii Pozdeev, Evgeni Vasiliev, Sergey Krasikov, Mariia Krasikova","doi":"arxiv-2409.02731","DOIUrl":"https://doi.org/arxiv-2409.02731","url":null,"abstract":"Acoustic black holes represent a special class of metastructures allowing\u0000efficient absorption based on the slow sound principle. The decrease of the\u0000wave speed is associated with the spatial variation of acoustic impedance,\u0000while the absorption properties are linked to thermoviscous losses induced by\u0000the local resonances of the structure. While most of the developments in the\u0000field of sonic black holes are dedicated to one-dimensional structures, the\u0000current study is concerned with their two-dimensional counterparts. It is shown\u0000that the change of the dimensionality results in the change of noise insulation\u0000mechanism, which relies on the opening of band-gaps rather then thermoviscous\u0000losses. The formation of band-gaps is associated with the strong coupling\u0000between the resonators constituting the considered structures. Numerically and\u0000experimentally it is shown than the structure is characterized by broad\u0000stop-bands in transmission spectra, while the air flow propagation is still\u0000allowed. In particular, a realistic application scenario is considered, in\u0000which the acoustic noise and the air flow are generated by a fan embedded into\u0000a ventilation duct. The obtained results pave the way towards the development\u0000of next-level ventilated metamaterials for efficient noise control.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177806","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

Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency 多径信号选择性元表面：改变同频信号空间阻抗的无源时变互锁机制

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02484

Kaito Tachi, Kota Suzuki, Kairi Takimoto, Shunsuke Saruwatari, Kiichi Niitsu, Peter Njogu, Hiroki Wakatsuchi

{"title":"Multipath Signal-Selective Metasurface: Passive Time-Varying Interlocking Mechanism to Vary Spatial Impedance for Signals with the Same Frequency","authors":"Kaito Tachi, Kota Suzuki, Kairi Takimoto, Shunsuke Saruwatari, Kiichi Niitsu, Peter Njogu, Hiroki Wakatsuchi","doi":"arxiv-2409.02484","DOIUrl":"https://doi.org/arxiv-2409.02484","url":null,"abstract":"Electromagnetic (EM) multipath interference is difficult to address with\u0000passive approaches due to two physical restrictions - the shared frequency of\u0000the initial and interfering signals and their variable incident angles. Thus,\u0000to address multipath interference, the spatial impedance must be adjusted in\u0000response to the incident angles of multiple signals with the same frequency,\u0000which is impossible with classic linear time-invariant (LTI) systems. We\u0000present a design concept for metasurface-based spatial filters to overcome LTI\u0000behavior and suppress multipath interference signals using a time-varying\u0000interlocking mechanism without any active biasing systems. The proposed devices\u0000are coupled to the first incoming wave to adjust the spatial impedance and\u0000suppress delayed waves in the time domain, which is validated numerically and\u0000experimentally. This study opens a new avenue for passive yet time-varying\u0000selective EM metasystems, enabling the adjustment of spatially complicated EM\u0000waves and fields even at the same frequency.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177809","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

Frequency-domain Parallel Computing Using Single On-Chip Nonlinear Acoustic-wave Device 利用单芯片非线性声波器件进行频域并行计算

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02689

Jun Ji, Zichen Xi, Bernadeta R. Srijanto, Ivan I. Kravchenko, Ming Jin, Wenjie Xiong, Linbo Shao

引用次数: 0

A design of magnetic tunnel junctions for the deployment of neuromorphic hardware for edge computing 用于部署边缘计算神经形态硬件的磁隧道结设计

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02528

Davi Rodrigues, Eleonora Raimondo, Riccardo Tomasello, Mario Carpentieri, Giovanni Finocchio

{"title":"A design of magnetic tunnel junctions for the deployment of neuromorphic hardware for edge computing","authors":"Davi Rodrigues, Eleonora Raimondo, Riccardo Tomasello, Mario Carpentieri, Giovanni Finocchio","doi":"arxiv-2409.02528","DOIUrl":"https://doi.org/arxiv-2409.02528","url":null,"abstract":"The electrically readable complex dynamics of robust and scalable magnetic\u0000tunnel junctions (MTJs) offer promising opportunities for advancing\u0000neuromorphic computing. In this work, we present an MTJ design with a free\u0000layer and two polarizers capable of computing the sigmoidal activation function\u0000and its gradient at the device level. This design enables both feedforward and\u0000backpropagation computations within a single device, extending neuromorphic\u0000computing frameworks previously explored in the literature by introducing the\u0000ability to perform backpropagation directly in hardware. Our algorithm\u0000implementation reveals two key findings: (i) the small discrepancies between\u0000the MTJ-generated curves and the exact software-generated curves have a\u0000negligible impact on the performance of the backpropagation algorithm, (ii) the\u0000device implementation is highly robust to inter-device variation and noise, and\u0000(iii) the proposed method effectively supports transfer learning and knowledge\u0000distillation. To demonstrate this, we evaluated the performance of an edge\u0000computing network using weights from a software-trained model implemented with\u0000our MTJ design. The results show a minimal loss of accuracy of only 0.1% for\u0000the Fashion MNIST dataset and 2% for the CIFAR-100 dataset compared to the\u0000original software implementation. These results highlight the potential of our\u0000MTJ design for compact, hardware-based neural networks in edge computing\u0000applications, particularly for transfer learning.","PeriodicalId":501083,"journal":{"name":"arXiv - PHYS - Applied Physics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177813","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

Green's Function Approach to Model Vibrations of Beams with Spatiotemporally Modulated Properties 用格林函数法模拟具有时空调制特性的梁的振动

arXiv - PHYS - Applied Physics Pub Date : 2024-09-04 DOI: arxiv-2409.02829

Benjamin M. Goldsberry, Andrew N. Norris, Samuel P. Wallen, Michael R. Haberman

引用次数: 0

Hot carrier solar cells by adiabatic cooling 绝热冷却热载流子太阳能电池

arXiv - PHYS - Applied Physics Pub Date : 2024-09-03 DOI: arxiv-2409.01716

Tom Markvart

引用次数: 0