Applied Physics Letters最新文献_第10页

Engineering magnetic chirality in FeGe nanocylinders: Exploring topological states for spintronic applications

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0227594

Eduardo Saavedra, Lucy A. Valdez, Pablo Díaz, Noelia Bajales, Juan Escrig

{"title":"Engineering magnetic chirality in FeGe nanocylinders: Exploring topological states for spintronic applications","authors":"Eduardo Saavedra, Lucy A. Valdez, Pablo Díaz, Noelia Bajales, Juan Escrig","doi":"10.1063/5.0227594","DOIUrl":"https://doi.org/10.1063/5.0227594","url":null,"abstract":"Iron germanide (FeGe) emerges as a promising magnetic alloy for spintronics and high-density data storage, owing to its distinctive magnetic properties and compatibility with existing fabrication techniques. This compatibility enables the synthesis of customized FeGe nanocylinders characterized by chirality, where their magnetization asymmetrically twists. Within specific size parameters, these nanocylinders can accommodate skyrmions—swirling magnetic structures with significant implications for information storage and processing technologies. This study investigates the response of FeGe nanocylinders to external magnetic fields, focusing on how their magnetic properties vary with dimensions (diameter and length). Specifically, we analyze the impact of length on the pseudo-static properties of short FeGe nanocylinders and examine the average topological charge and remanence states across different aspect ratios. Our investigation underscores the relationship between chirality and diverse magnetization states in four types of nanocylinders with varying aspect ratios. This comprehensive analysis elucidates the connection between nanocylinder magnetic states and the average topological charge—a critical factor in advancing ultra-low-energy data storage and logic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"24 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873890","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

Quasi-BIC realized in a subwavelength volumetric split ring-based resonator

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0237363

Sergey V. Geyman, Viktor M. Puchnin, Alexey P. Slobozhanyuk, Mikhail V. Rybin, Alena V. Shchelokova

{"title":"Quasi-BIC realized in a subwavelength volumetric split ring-based resonator","authors":"Sergey V. Geyman, Viktor M. Puchnin, Alexey P. Slobozhanyuk, Mikhail V. Rybin, Alena V. Shchelokova","doi":"10.1063/5.0237363","DOIUrl":"https://doi.org/10.1063/5.0237363","url":null,"abstract":"In recent years, resonant structures with quasi-bound states in the continuum (quasi-BICs) have significantly expanded the practical possibilities in optics and nanophotonics. A similar mode, the so-called supercavity mode, observed in single dielectric cylinders with high permittivity and low material losses, allows achieving extremely high quality (Q) factors. Resonators supporting quasi-BICs are also promising for applications in the radio frequency range. However, creating compact structures using high-permittivity materials at frequencies below 300 MHz is challenging. This study introduces a subwavelength (∼λ/13) volumetric structure composed of two arrays of coupled split ring resonators, with one array located inside the other, which provides a supercavity mode. The numerical Q factor of this mode is increased by approximately 100 times under lossless conditions and by about 1.5 times when accounting for material losses compared to that of non-interacting modes of the two arrays. The Q factor enhancement is confirmed experimentally by near-field measurements. The advantages of the proposed resonator include its hollow cavity, ease of fabrication, and frequency tunability within the radio frequency range.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"20 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873914","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

Electronic band structure vs intrinsic antisite doping in the MBE grown films MnTe · Bi(2−x)Te3(1−x/2) (0 ≥ x < 2): Evidence from spectroscopic ellipsometry and infrared studies

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0238665

N. N. Kovaleva, D. Chvostova, A. V. Muratov, T. N. Fursova, S. I. Bozhko, Yu. A. Aleshchenko, A. Dejneka, K. I. Kugel, D. V. Ishchenko, O. E. Tereshchenko

{"title":"Electronic band structure vs intrinsic antisite doping in the MBE grown films MnTe · Bi(2−x)Te3(1−x/2) (0 ≥ x < 2): Evidence from spectroscopic ellipsometry and infrared studies","authors":"N. N. Kovaleva, D. Chvostova, A. V. Muratov, T. N. Fursova, S. I. Bozhko, Yu. A. Aleshchenko, A. Dejneka, K. I. Kugel, D. V. Ishchenko, O. E. Tereshchenko","doi":"10.1063/5.0238665","DOIUrl":"https://doi.org/10.1063/5.0238665","url":null,"abstract":"The intrinsic antisite defects, which cause doping in the antiferromagnetic topological insulators of the MnTe ·n Bi2Te3 (n = 1, 2, 3, …,) family, prevent the exploration of the Dirac states affecting the Fermi level (EF) position and magnetic properties. In the present study, the MnTe · Bi(2−x)Te3(1−x/2) films grown by the MBE technique onto Si(111) substrates with increasing the Bi and Te contents from MnTe to MnBi2Te4 were investigated by 0.5–6.5 eV spectroscopic ellipsometry. In addition, the infrared (IR) reflectance and transmittance spectra were examined. The measured ellipsometric angles, Ψ(ω) and Δ(ω), were simulated in a two- or three-layer Gaussian models. As a result, the spectra of the complex dielectric function, ε̃(ω)=ε1(ω)+iε2(ω), the complex index of refraction, ñ(ω)=n(ω)+ik(ω), and the optical conductivity σ1(ω) were determined. We found that the absolute values of the ε1(ω) and ε2(ω) increased with increasing the Bi and Te contents from MnTe to MnBi2Te4, while the ε2(ω) maximum progressively shifts to lower photon energies from ∼3.7 to ∼1.2 eV, peculiar of the end point compounds. At the same time, the stoichiometric MnBi2Te4 film exhibits the emergent Drude-type contribution in the far-IR range associated with the intrinsic antisite doping. However, the charge carrier contribution is suppressed in the MnTe · Bi(2−x)Te3(1−x/2) films with the reduced Bi and Te stoichiometry, the latter being also responsible for the electronic band structure reconstruction and pronounced redistribution of the optical spectral weight.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"58 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142879724","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

Diamagnetic levitation of water realized with a simple device consisting of ordinary permanent magnets

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0241203

Tomoya Naito, Tomoaki Suzuki, Yasuhiro Ikezoe

{"title":"Diamagnetic levitation of water realized with a simple device consisting of ordinary permanent magnets","authors":"Tomoya Naito, Tomoaki Suzuki, Yasuhiro Ikezoe","doi":"10.1063/5.0241203","DOIUrl":"https://doi.org/10.1063/5.0241203","url":null,"abstract":"Diamagnetic levitation is an appealing technique for levitating objects at room temperature without subjecting the sample to potentially damaging control fields, such as high-intensity laser light or sound pressure. However, owing to the extremely low magnetic susceptibility of diamagnetic materials, except for bismuth and graphite, diamagnetic levitation generally necessitates the use of exceptionally strong magnets, such as those found in world-class high-field facilities. This study simulated the magnetic field distribution in a narrow valley formed between two adjacent rectangular cuboid magnets with antiparallel magnetizations, at a spatial resolution of 5 μm. The simulations indicated the generation of a strong magnetic force field, B∂B/∂z(&gt;40 000 T2/m), which could lift not only light organic compounds but also dense metallic compounds. Moreover, the addition of another pair of smaller sized magnets provided a local potential minimum that satisfied the conditions for non-contact levitation. Based on these results, a compact magnetic levitation system was developed by combining four small commercially available magnets. Experimental results showed that a water droplet of approximately 0.3 mm diameter was levitated. The experimental space was nearly sealed and highly resistant to external disturbances, such as vibrations, allowing the water to remain in a non-contact levitated state unless the operator intentionally shook the experimental table or directed airflow to displace the water away. The device is expected to facilitate various applications in materials science and fluid dynamics as well as promote preliminary ground-based research on space-related experiments designed to be conducted in microgravity environments.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"287 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873828","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

Investigation of the origin of atomic-like emission at 4.09 eV from h-BN by correlating PL and XPS spectra

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0243547

N. Maharjan, P. Joshi, E. Janzen, J. H. Edgar, M. L. Nakarmi

引用次数: 0

Transparent pn junction in CuCrO2/WO3 for enhanced photovoltaic response and stability via high entropy perovskite Ba(Ti0.2Zr0.2Sn0.2Hf0.2Ce0.2)O3 transition layer

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0247786

Chengyu Jia, Bo He, Rui Wang, Dingwei Wang, Jun Cao, Lei Shi, Jiaqi Pan, Zhiguo Zhao, Chaorong Li

引用次数: 0

Perspectives on epitaxial InGaP for quantum and nonlinear optics

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0241224

Joshua Akin, Yunlei Zhao, A. K. M. Naziul Haque, Kejie Fang

引用次数: 0

Large switchable polarization and piezoelectricity in multiferroic BiFeO3-Bi0.5K0.5TiO3-based single crystals

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0245945

Li-Hua Yin, Peng Tong, Jie Yang, Wenhai Song, Yuping Sun

引用次数: 0

Electron beam characterization via quantum coherent optical magnetometry

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0234219

Nicolas DeStefano, Saeed Pegahan, Aneesh Ramaswamy, Seth Aubin, T. Averett, Alexandre Camsonne, Svetlana Malinovskaya, Eugeniy E. Mikhailov, Gunn Park, Shukui Zhang, Irina Novikova

引用次数: 0

Narrow-bandgap titanium sesquioxide with resonant metasurfaces for enhanced infrared absorption

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-12-23 DOI: 10.1063/5.0240125

Viktoriia E. Babicheva, Evgeniya Lock, Heungsoo Kim

{"title":"Narrow-bandgap titanium sesquioxide with resonant metasurfaces for enhanced infrared absorption","authors":"Viktoriia E. Babicheva, Evgeniya Lock, Heungsoo Kim","doi":"10.1063/5.0240125","DOIUrl":"https://doi.org/10.1063/5.0240125","url":null,"abstract":"We report on the structural, chemical, and optical properties of titanium sesquioxide Ti2O3 thin films on single-crystal sapphire substrates by pulsed laser deposition. The thin film of Ti2O3 on sapphire exhibits light absorption of around 25%–45% in the wavelength range of 2–10 μm. Here, we design an infrared photodetector structure based on Ti2O3, enhanced by a resonant metasurface, to improve its light absorption in mid-wave and long-wave infrared windows. We show that light absorption in the mid-wave infrared window (wavelength 3–5 μm) in the active Ti2O3 layer can be significantly enhanced from 30%–40% to more than 80% utilizing a thin resonant metasurface made of low-loss silicon, facilitating efficient scattering in the active layer. Furthermore, we compare the absorptance of the Ti2O3 layer with that of conventional semiconductors, such as InSb, InAs, and HgCdTe, operating in the infrared range with a wavelength of 2–10 μm and demonstrate that the absorption in the Ti2O3 film is significantly higher than in these conventional semiconductors due to the narrow-bandgap characteristics of Ti2O3. The proposed designs can be used to tailor the wavelengths of photodetection across the near- and mid-infrared ranges.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"53 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873903","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