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arXiv 2021年

作者： Ghosh, Subhajit Kargar, Fariborz Mohammadzadeh, Amirmahdi Rumyantsev, Sergey Balandin, Alexander A. Department of Electrical and Computer Engineering Bourns College of Engineering University of California RiversideCA92521 United States Centera Laboratories Institute of High-Pressure Physics Polish Academy of Sciences Warsaw01-142 Poland Center Materials Science and Engineering Program University of California RiversideCA92521 United States

We investigated low-frequency current fluctuations, i.e. noise, in the quasi-two-dimensional (2D) van der Waals antiferromagnetic semiconductor FePS3 with the electronic bandgap of 1.5 eV. The electrical and noise characteristics of the p-type, highly resistive, thin films of FePS3 were measured at different temperatures. The noise spectral density was of the 1/f-type over most of the examined temperature range but revealed well-defined Lorentzian bulges, and increased strongly near the Néel temperature TN=118 K (f is the frequency). Intriguingly, the noise spectral density attained its minimum at temperature T~200 K, which was attributed to an interplay of two opposite trends in noise scaling - one for semiconductors and another for materials with the phase transitions. The Lorentzian corner frequencies revealed unusual dependence on temperature and bias voltage, suggesting that their origin is different from the generation - recombination noise in conventional semiconductors. The obtained results are important for proposed applications of antiferromagnetic semiconductors in spintronic devices. They also attest to the power of the noise spectroscopy for monitoring various phase transitions. Copyright © 2021, The Authors. All rights reserved.

关键词： Spectral density

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Market Basket Analysis Using Apriori and FP-Growth for Analysis Consumer Expenditure Patterns at Berkah Mart in Pekanbaru Riau

Market Basket Analysis Using Apriori and FP-Growth for Analy...

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2018 Workshop on Multidisciplinary and Its Applications: Applied Mathematics, computer science, Information Systems, and Information Technology, WMA-Mathcomtech 2018

作者： Mustakim Herianda, Della Maulina Ilham, Ahmad Daeng Gs, Achmad Laumal, Folkes E. Kurniasih, Nuning Iskandar, Akbar Manulangga, Gloria Indra Iswara, Ida Bagus Ary Rahim, Robbi Puzzle Research Data Technology UIN Sultan Syarif Kasim Riau Indonesia Department of Information System UIN Sultan Syarif Kasim Riau Indonesia Informatics Department Universitas Muhammadiyah Semarang Semarang Indonesia Department of Management University of 45 Surabaya Surabaya Indonesia Department of Electrical Engineering Politeknik Negeri Kupang Kupang Indonesia Faculty of Communication Sciences Library and Information Science Program Universitas Padjadjaran Bandung Indonesia Informatics Engineering STMIK AKBA Makassar Indonesia Informatics Department STMIK STIKOM Indonesia Denpasar Indonesia School of Computer and Communication Engineering Universiti Malaysia Perlis Kubang Gajah Malaysia

Berkah Mart is one of the new minimarkets in Pekanbaru city which began to develop as a retail business to meet the needs of the community. In his operation, Berkah Mart still uses the traditional store management perception that the placement of product layout on sale shelves has not been through sales analysis. Existing products have not been reviewed from the consumer's point of view, whereas the marketing economics concept provides a variety of product and consumer management methods for business management in Berkah Mart, including market bucket analysis techniques and various itemset search algorithms. In this research, Market Basket Basket Analysis with FP-Growth algorithm is proposed to determine the layout and planning of goods availability. The application of FP-Growth algorithm proved to be useful in generating many and informative association rules to find out the consumer spending pattern at Berkah Mart in Pekanbaru. Moreover, from the rules of the customer association can be segmented separately to meet the specific needs of customers with cost-effective by using some special promotions for the general group. The experimental results show that FP-Growth algorithm can analyze quickly and efficiently informing consumer shopping pattern at Berkah Mart and can increase Berkah Mart revenue. © Published under licence by IOP Publishing Ltd.

关键词： Sales

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Dynamics of ultrafast magnetization reversal in submicron elliptical Permalloy thin film elements

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Physical Review B 2006年第10期73卷 104425-104425页

作者： Q. F. Xiao J. Rudge B. C. Choi Y. K. Hong G. Donohoe Department of Physics and Astronomy University of Victoria Victoria BC Canada V8W 3P6 Department of Materials Science and Engineering University of Idaho Moscow Idaho 83844 USA Department of Electrical and Computer Engineering University of Idaho Moscow Idaho 83844 USA

The micromagnetic dynamics of ultrafast magnetization reversal in elliptical Permalloy (Ni80Fe20) thin film elements is described. It is shown that coherent rotation and magnetization ringing in submicron Py elements can be controlled by adjusting the axis ratio of the ellipse, the thickness, and the angle of the magnetic field pulse. For the elliptical Py element with 400−nm-long axis, 200−nm-short axis, and 4.7nm thickness, the nonuniform distribution of magnetization results from a strong in-plane, nonuniform demagnetization field during magnetization precession. It is the main reason magnetization ringing appears, even though the average values of My and Mz are equal to zero at the moment the pulse is terminated. The simulation results indicate that uniformity in the distribution of the magnetization during reversal is improved by reducing the length of the short axis from 200to112nm, and reducing the thickness of the thin film from 4.7to3.2nm. The modification in the geometric configuration of the element is found to effectively suppress the magnetization ringing.

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Relationship between orbital moment anisotropy, magnetocrystalline anisotropy, and Dzyaloshinskii-Moriya interaction in W/Co/Pt trilayers

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Physical Review B 2024年第18期110卷 184401页

作者： Zhendong Chi Yong-Chang Lau Vanessa Li Zhang Goro Shibata Shoya Sakamoto Yosuke Nonaka Keisuke Ikeda Yuxuan Wan Masahiro Suzuki Masashi Kawaguchi Masako Suzuki-Sakamaki Kenta Amemiya Naomi Kawamura Masaichiro Mizumaki Motohiro Suzuki Hyunsoo Yang Masamitsu Hayashi Atsushi Fujimori Department of Physics Tsukuba Ibaraki 305-0047 Japan School of Physics and Technology Materials Sciences Research Center Institute for Solid State Physics Institute of Materials Structure Science Graduate School of Science and Technology Gunma University Kiryu Gunma 376-8515 Japan (JASRI) Sayo 679-5198 Japan Department of Electrical and Computer Engineering Department of Physics and Center for Quantum Science and Technology

We have studied the Co layer thickness dependences of magnetocrystalline anisotropy (MCA), Dzyaloshinskii-Moriya interaction (DMI), and orbital moment anisotropy (OMA) in W/Co/Pt trilayers, in order to clarify their correlations with each other. We find that the MCA favors magnetization along the film normal and monotonically increases with decreasing effective magnetic layer thickness (teff). The magnitude of the Dzyaloshinskii-Moriya exchange constant (|D|) increases with decreasing teff until teff∼1 nm, below which |D| decreases. The MCA and |D| scale with 1/teff for teff larger than ∼1 nm, indicating an interfacial origin. The increase of MCA with decreasing teff continues below teff∼ 1 nm, but with a slower rate. To clarify the cause of the teff dependences of MCA and DMI, the OMA of Co in W/Co/Pt trilayers is studied using x-ray magnetic circular dichroism. We find nonzero OMA when teff is smaller than ∼0.8 nm. The OMA increases with decreasing teff more rapidly than what is expected from the MCA, indicating that factors other than OMA contribute to the MCA at small teff. The teff dependence of the OMA also suggests that |D| at teff smaller than ∼1 nm is not related to the OMA at the interface. We propose that the growth of Co on W results in a strain and/or texture that reduces the interfacial DMI, and, to some extent, MCA at small teff.

关键词： Dzyaloshinskii-Moriya interaction Magnetic anisotropy Multilayer thin films X-ray absorption spectroscopy X-ray magnetic circular dichroism

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Charge-Transfer Hyperbolic Polaritons in α-MoO3/graphene heterostructures

arXiv

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arXiv 2024年

作者： Shen, Jialiang Chen, M. Korostelev, V. Kim, H. Fathi-Hafshejani, P. Mahjouri-Samani, M. Klyukin, K. Lee, G.-H. Dai, S. Materials Research and Education Center Department of Mechanical Engineering Auburn University AuburnAL36849 United States Department of Materials Science and Engineering Seoul National University Gwanak-ro 1 Gwanak-gu Seoul08826 Korea Republic of Department of Electrical and Computer Engineering Auburn University AuburnAL36849 United States

Charge transfer is a fundamental interface process that can be harnessed for light detection, photovoltaics, and photosynthesis. Recently, charge transfer was exploited in nanophotonics to alter plasmon polaritons by involving additional non-polaritonic materials to activate the charge transfer. Yet, direct charge transfer between polaritonic materials hasn’t been demonstrated. We report the direct charge transfer in pure polaritonic van der Waals (vdW) heterostructures of αMoO3/graphene. We extracted the Fermi energy of 0.6 eV for graphene by infrared nano-imaging of charge transfer hyperbolic polaritons in the vdW heterostructure. This unusually high Fermi energy is attributed to the charge transfer between graphene and α-MoO3. Moreover, we have observed charge transfer hyperbolic polaritons in multiple energy-momentum dispersion branches with a wavelength elongation of up to 150%. With support from the DFT calculation, we find that the charge transfer between graphene and α-MoO3, absent in mechanically assembled vdW heterostructures, is attributed to the relatively pristine heterointerface preserved in the epitaxially grown vdW heterostructure. The direct charge transfer and charge transfer hyperbolic polaritons demonstrated in our work hold great promise for developing nano-optical circuits, computational devices, communication systems, and light and energy manipulation devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Charge transfer

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A Floating RESURF EDMOS with enhanced Safe Operating Area

A Floating RESURF EDMOS with enhanced Safe Operating Area

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2007 International Workgroup on Physics of Semiconductor Devices (IWPSD 2007), part 2

作者： Hao Wang Abraham Yoo H. P. Edward Xu Wai Tung Ng Kenji Fukumoto Akira Ishikawa Hisaya Imai Kimio Sakai Kaoru Takasuka Materials Science & Engineering Department University of Toronto Toronto ONT Canada University of Toronto Toronto ON CA Electrical & Computer Engineering Department University of Toronto Toronto ONT Canada Asahi kasei EMD Corporation Shinjuku Tokyo Japan

In this paper, a floating RESURF EDMOS (BV=55V, R{sub}(on,sp)=36.5mΩ·mm{sup}2) with 400% enhanced Safe Operating Area (SOA) will be discussed and compared to the conventional EDMOS structure. The proposed EDMOS has both drain and source engineering to enhance SOA, not only via reducing the base resistance of the parasitic bipolar transistor, but also suppressing the base current of the parasitic bipolar transistor at high V{sub}(GS) and high V{sub}(DS) situations. Furthermore, the buried deep Nwell allow the device to have better tradeoff between breakdown voltage and on-resistance.

关键词： EDMOS Safe Operation Area (SOA) Floating RESURF Parasitic bipolar transistor

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Composition dependence of the infrared dielectric functions in Si-doped hexagonal AlxGa1−xN films on c-plane sapphire substrates

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Physical Review B 2005年第24期72卷 245326-245326页

作者： Z. G. Hu M. Strassburg N. Dietz A. G. U. Perera A. Asghar I. T. Ferguson Department of Physics and Astronomy Georgia State University Atlanta Georgia 30303 USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

The optical properties of hexagonal AlxGa1−xN (x from 0.05 to 0.42) epitaxial films with Si doping concentrations up to 1018cm−3 grown on c-plane sapphire substrates by metal-organic chemical vapor deposition have been investigated using infrared reflectance spectra. The dielectric functions (ε=ε1+iε2) of the AlxGa1−xN films are determined in the wavelength region of 1.54–50μm at room temperature. The experimental reflectance spectra are analyzed using classical harmonic Lorentz oscillators and Drude model in the transparent, reststrahlen, and free carrier absorption regions. GaN-like E1 transverse-optical (TO) phonon frequency linearly decreases and its strength increases with decreasing Al composition. However, AlN-like E1(TO) phonon frequency shows a relatively weak composition dependence and its strength increases with increasing composition. At a wavelength of 1.54μm, ε1 varies between 4.86 and 5.2 when the composition x changes from 0.05 to 0.42 and ε2 is close to zero. The longitudinal-optical phonon plasmon (LPP) coupled modes of n-type hexagonal AlxGa1−xN films are also discussed. For samples with higher concentrations beyond 1018cm−3 the upper LPP coupled mode frequencies increase with increasing carrier concentration indicating the transition from phononlike to plasmonlike behavior.

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Skin-like cryogel electronics from suppressed-freezing tuned polymer amorphization

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Nature Communications 2023年第1期14卷 1-10页

作者： Zhang, Xiansheng Yan, Hongwei Xu, Chongzhi Dong, Xia Wang, Yu Fu, Aiping Li, Hao Lee, Jin Yong Zhang, Sheng Ni, Jiahua Gao, Min Wang, Jing Yu, Jinpeng Ge, Shuzhi Sam Jin, Ming Liang Wang, Lili Xia, Yanzhi State Key Laboratory of Bio-Fibers and Eco-Textiles College of Textiles and Clothing Qingdao University Qingdao 266071 China Institute for Future Shandong Key Laboratory of Industrial Control Technology School of Automation Qingdao University Qingdao 266071 China College of Materials Science and Engineering Qingdao University Qingdao 266071 China CAS Key Laboratory of Engineering Plastics Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Chemistry SungKyunKwan University Suwon 16419 South Korea State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical Engineering Zhejiang University Hangzhou 310027 China College of Biological Science and Medical Engineering Donghua University Shanghai 201620 China Institute of Environmental Engineering ETH Zürich Zürich 8093 Switzerland Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore

The sole situation of semi-crystalline structure induced single performance remarkably limits the green cryogels in the application of soft devices due to uncontrolled freezing field. Here, a facile strategy for achieving multifunctionality of cryogels is proposed using total amorphization of polymer. Through precisely lowering the freezing point of precursor solutions with an antifreezing salt, the suppressed growth of ice is achieved, creating an unusually weak and homogenous aggregation of polymer chains upon freezing, thereby realizing the tunable amorphization of polymer and the coexistence of free and hydrogen bonding hydroxyl groups. Such multi-scale microstructures trigger the integrated properties of tissue-like ultrasoftness (Young’s modulus <10 kPa) yet stretchability, high transparency (~92%), self-adhesion, and instantaneous self-healing (<0.3 s) for cryogels, along with superior ionic-conductivity, antifreezing (−58 °C) and water-retention abilities, pushing the development of skin-like cryogel electronics. These concepts open an attractive branch for cryogels that adopt regulated crystallization behavior for on-demand functionalities. © 2023, Springer Nature Limited.

关键词： Gels and hydrogels Polymers

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A stretchable electrode array for non-invasive, skin-mounted measurement of electrocardiography (ECG), electromyography (EMG) and electroencephalography (EEG)

A stretchable electrode array for non-invasive, skin-mounted...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Rui Ma Dae-Hyeong Kim Martin McCormick Todd Coleman John Rogers University of Illinois Urbana-Champaign Urbana IL USA Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Department of Materials Science and Engineering University of Illinois Urbana-Champaign Urbana IL USA

This paper reports a class of stretchable electrode array capable of intimate, conformal integration onto the curvilinear surfaces of skin on the human body. The designs employ conventional metallic conductors but in optimized mechanical layouts, on soft, thin elastomeric substrates. These devices exhibit an ability to record spontaneous EEG activity even without conductive electrolyte gels, with recorded alpha rhythm responses that are 40% stronger than those collected using conventional tin electrodes and gels under otherwise similar conditions. The same type of device can also measure high quality ECG and EMG signals. The results suggest broad utility for skin-mounted measurements of electrical activity in the body, with advantages in signal levels, wearability and modes of integration compared to alternatives.

关键词： Electrodes Arrays Electroencephalography Electrocardiography Skin Electromyography materials

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Model-based Iterative Reconstruction for Low-dose Electron Tomography

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Microscopy and Microanalysis 2014年第S3期20卷 802-803页

作者： Singanallur V. Venkatakrishnan Ming-Siao Hsiao Nick Garvin Michael A. Jackson Marc De Graef Jeff Simmons Charles A. Bouman Lawrence F. Drummy School of Electrical and Computer Engineering Purdue University IN 47906 Materials and Manufacturing Directorate Air Force Research Laboratories WPAFB OH 45433 BlueQuartz Software LLC Springboro OH 45066 Department of Material Science and Engineering Carnegie Mellon University PA 15213

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