Applied Physics Letters最新文献_第3页

Generation of high and bidirectional out-of-plane spin–orbit torque through vertical magnetization gradient

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-31 DOI: 10.1063/5.0251658

Tianli Jin, Yuliang Zhu, Shaomin Li, Bo Zhang, Funan Tan, Gerard Joseph Lim, Jiangwei Cao, Kaiming Cai, Wen Siang Lew

{"title":"Generation of high and bidirectional out-of-plane spin–orbit torque through vertical magnetization gradient","authors":"Tianli Jin, Yuliang Zhu, Shaomin Li, Bo Zhang, Funan Tan, Gerard Joseph Lim, Jiangwei Cao, Kaiming Cai, Wen Siang Lew","doi":"10.1063/5.0251658","DOIUrl":"https://doi.org/10.1063/5.0251658","url":null,"abstract":"High efficiency and out-of-plane spin–orbit torque (OOP-SOT) driven magnetization switching is essential for developing spin-based memory and logic devices. In this study, we report the generation of a large charge-to-spin conversion and bidirectional OOP-SOT by engineering a vertical magnetization gradient within a Co/Ho multilayer system. Exploiting the antiferromagnetic coupling between Co and Ho, the magnetization gradient up to 16.8 (emu/cm−3)/nm was achieved by gradually varying the Ho layer thickness from 0.4 to 0.9 nm. The presence of the OOP-SOT was confirmed through Hall resistance-field loop shift measurements, which has been attributed to the broken symmetry in spin current reflection and transmission in the Co/Ho multilayer with vertical magnetic property gradients. Additionally, the effective field of the OOP-SOT is strongly correlated with the direction of the magnetization gradient, measured to be around +0.7 and –2.5 Oe/mA for the positive and negative magnetization gradients, respectively. Furthermore, the largest SOT in the Co/Ho multilayer with a negative gradient was observed compared to the positive gradient and uniform Co/Ho multilayer structures. The enhanced SOT is attributed to the bulk Rashba field generated by the gradient structure, along with increased spin polarization. The results demonstrated here provide a promising approach for utilizing magnetization gradients for the development of efficient, current-driven spin-based storage and logic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"103 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143744830","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

π /2-periodic planar Hall effect in MnGe thin films

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-31 DOI: 10.1063/5.0254689

Zhaohang Li, Fanbao Meng, Kesen Zhao, Xiangyu Hua, Zongyao Huang, Feixiong Quan, Hua Ge, Ziji Xiang, Tao Wu, Wenjie Meng, Yubin Hou, Qingyou Lu, Xianhui Chen

引用次数: 0

Experiments on unidirectional excitation of designer flexural edge waves

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-31 DOI: 10.1063/5.0252438

Kun Tang, Qinhao Lin, Yichao Xu, Da Gao, Yuqi Wang, Yibin Li

引用次数: 0

Charge redistribution to reduce contact resistivity in NiSi/Si system through interface modification: A first-principles study

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-31 DOI: 10.1063/5.0251483

Miaojia Yuan, Maokun Wu, Yichen Wen, Yilin Hu, Xuepei Wang, Boyao Cui, Jinhao Liu, Yishan Wu, Hong Dong, Feng Lu, Wei-Hua Wang, Pengpeng Ren, Sheng Ye, Hongliang Lu, Runsheng Wang, Zhigang Ji

{"title":"Charge redistribution to reduce contact resistivity in NiSi/Si system through interface modification: A first-principles study","authors":"Miaojia Yuan, Maokun Wu, Yichen Wen, Yilin Hu, Xuepei Wang, Boyao Cui, Jinhao Liu, Yishan Wu, Hong Dong, Feng Lu, Wei-Hua Wang, Pengpeng Ren, Sheng Ye, Hongliang Lu, Runsheng Wang, Zhigang Ji","doi":"10.1063/5.0251483","DOIUrl":"https://doi.org/10.1063/5.0251483","url":null,"abstract":"The metal–semiconductor contact resistivity has become a severe challenge for three-dimensional (3D) integration. In this work, starting from the physical origin, we propose that the charge redistribution is an effective strategy for decreasing Schottky barrier height (SBH), subsequently leading to a reduction in contact resistivity. Guided by this perspective, first-principles calculations are utilized to investigate the effect of a series of metal dopants on the SBH in the NiSi/Si system. The ΦBe values of NiSi/Si can be reduced to 0.27, 0.28, and 0.22 eV in Sc, Ti, and Zr doped systems, respectively. Especially for the Zr dopant, it can achieve ultra-low contact resistivity of 2.30 × 10−9 Ω cm2, which can be ascribed to the dominant charge redistribution effect. In contrast, high electronegativity dopants like Au and Ir increase ΦBe. Dopant diffusion and concentration effects are also examined, demonstrating the feasibility of this approach. This work provides a useful theoretical guidance in reducing contact resistivity for 3D integration.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"15 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143744694","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

Tunable layer-locked valley Hall effect in ferroelectric-magnetic-valley coupled breathing Kagome bilayer W3Br8

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-31 DOI: 10.1063/5.0257819

Yuxin Liu, Fanzheng Chen, Guichao Hu, Xiuwen Zhao, Xiaobo Yuan, Junfeng Ren

引用次数: 0

Synchrotron 3D-RSM reveals the microstructure of superconducting YBa2Cu3O7−x films grown on various substrates

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-28 DOI: 10.1063/5.0253998

Qingyu He, Erhao Peng, Jiquan Zhang, Fucong Chen, Zhongpei Feng, Jiangxiao Li, Xinyan Chen, Yajun Tao, Yueliang Gu, Yongqi Dong, Jie Yuan, Kui Jin, Chen Gao, Zhenlin Luo

{"title":"Synchrotron 3D-RSM reveals the microstructure of superconducting YBa2Cu3O7−x films grown on various substrates","authors":"Qingyu He, Erhao Peng, Jiquan Zhang, Fucong Chen, Zhongpei Feng, Jiangxiao Li, Xinyan Chen, Yajun Tao, Yueliang Gu, Yongqi Dong, Jie Yuan, Kui Jin, Chen Gao, Zhenlin Luo","doi":"10.1063/5.0253998","DOIUrl":"https://doi.org/10.1063/5.0253998","url":null,"abstract":"Further unleashing the full potential of YBa2Cu3O7−x (YBCO), a premier high-temperature superconductor, for devices in advanced communication technologies hinges on the refinement of its fabrication process. In this work, a synchrotron three-dimension reciprocal space mapping (3D-RSM) technique, which offers a larger Q-space range and higher spatial resolution, was developed and used to analyze YBCO films grown on (001)-oriented LAO, STO, and MgO substrates. The 3D-RSM results reveal that epitaxial YBCO c domains dominate the films, with minor YBCO a domains in YBCO/LAO. The YBCO c domains present a consistent epitaxial relationship with the substrate STO and LAO, with the domain boundary parallel to the substrate [110] or [1¯10] axes. In contrast, YBCO/MgO films exhibit two distinct in-plane epitaxy orientations. Quantitatively measured lattice constants indicate the possible Tc-related oxygen vacancy condition therein. A 2-in. YBCO/MgO film, prepared by a homemade pulsed laser deposition system, verified the structural non-uniformity issues, suggesting room for further optimization. This study underscores the advantages of synchrotron-based 3D-RSM for microstructure analysis, which could support process improvement and performance optimization in high-frequency applications.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"1 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723182","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

Microdisk HgCdTe lasers operating at 22–25 μm under optical pumping

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-28 DOI: 10.1063/5.0253661

A. A. Razova, V. V. Rumyantsev, K. A. Mazhukina, V. V. Utochkin, M. A. Fadeev, A. A. Dubinov, V. Ya. Aleshkin, N. N. Mikhailov, S. A. Dvoretsky, D. V. Shengurov, N. S. Gusev, E. E. Morozova, V. I. Gavrilenko, S. V. Morozov

引用次数: 0

Competing polar phases in 2D ferroelectric transition metal thio- and selenophosphates

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-28 DOI: 10.1063/5.0253879

Sabine Neumayer, Huimin Qiao, Nina Balke

引用次数: 0

Biomimetic spider web sensor designed with memristive oscillators for location-resolved disturbance detection

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-27 DOI: 10.1063/5.0249837

Wenbo Sun, Yungang Li, Christy G. Jenson, S. M. Sadaf, Qiang Yu, Yiwen Zhang, Xinjun Liu

{"title":"Biomimetic spider web sensor designed with memristive oscillators for location-resolved disturbance detection","authors":"Wenbo Sun, Yungang Li, Christy G. Jenson, S. M. Sadaf, Qiang Yu, Yiwen Zhang, Xinjun Liu","doi":"10.1063/5.0249837","DOIUrl":"https://doi.org/10.1063/5.0249837","url":null,"abstract":"This article introduces a memristor-coupled oscillatory network utilizing niobium dioxide (NbO2) memristors and a biomimetic spider web structure. It focuses on the dynamic behaviors of single oscillators and small-scale networks within this unique system, particularly emphasizing voltage, current, and frequency characteristics. By strategically applying step voltage signals on a 1 + 3 node single-layer bio-inspired spider network, a single disturbance or multiple disturbances were addressed under continuous external stimuli, with analyzing phase differences induced by disturbances at various locations within the network and systematically categorizing these phases to empower decision-making. These pattern differences enable precise location-resolved disturbance detection through eight encodable phase patterns and their corresponding phase-space trajectories, showcasing memristors' precision in dynamic control. Additionally, amplitude changes and phase relationships between oscillators can be visually represented through color-mapped voltage values. This work opens avenues for developing intelligent, adaptive systems, advancing neuromorphic computing, and intelligent system control, offering possibilities for artificial intelligence to process complex information.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"57 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723192","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

Multifunctional VO2 metasurface thermal emitter with switchable radiation bandwidth and direction

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-03-27 DOI: 10.1063/5.0252481

Fuming Yang, Zhongzhu Liang, Xiaoyan Shi, Jinhuan Li, Zhe Wu, Siyu Guo, Xiangtao Chen, Wenwen Sun, Xintong Wei, Jihui Jiang, Junying Liu

{"title":"Multifunctional VO2 metasurface thermal emitter with switchable radiation bandwidth and direction","authors":"Fuming Yang, Zhongzhu Liang, Xiaoyan Shi, Jinhuan Li, Zhe Wu, Siyu Guo, Xiangtao Chen, Wenwen Sun, Xintong Wei, Jihui Jiang, Junying Liu","doi":"10.1063/5.0252481","DOIUrl":"https://doi.org/10.1063/5.0252481","url":null,"abstract":"The controllability of the spectral width and intensity of long-wave infrared (LWIR) emission is essential for various applications, including optical stealth, infrared radiation sources, and infrared lasers. Here, we proposed a multifunctional LWIR metasurface emitter with a switchable radiation state, which consists of germanium (Ge) rectangular pair resonators placed on a vanadium oxide (VO2) film. By manipulating the reversible metal-to-insulator phase transition of phase change material VO2, the spatial and spectral emission characteristics could be dynamically controlled. The high loss of metallic VO2 enables broadband emission in the LWIR band. The average emissivity in the 8–12 μm range reaches 91.3% and exhibits wide-angle emission properties. When the VO2 is transformed to the insulating phase, the coupling effect of the symmetry-breaking rectangle with two quasi-bound states in the continuum modes enhances the emission intensity of VO2 at a selective wavelength. This results in narrowband emission with a high-quality factor (Q-factor) and high directional selectivity. Notably, the emission peak's linewidth is only 28 nm, with a Q-factor of 293, and the average emissivity in the 8–12 μm range drops to 9.4%. Overall, the proposed metasurface device achieves an LWIR emissivity switching ratio of 9.7 between its two operating modes, showcasing significant differences in spectral and spatial radiation characteristics.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"183 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723391","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