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< Page ,Total 17 >
Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni0.81Fe0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer EI SCIE
期刊论文 | 2021 , 125 (43) , 24025-24031 | JOURNAL OF PHYSICAL CHEMISTRY C
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Abstract :

Permalloy with low ferromagnetic resonance linewidth has great application potential in spintronic/microwave devices. In this work, we demonstrated that the nonmagnetic (Cu) layer's sputtering rate has a considerable impact on Ni0.81Fe0.19's linewidth in Cu (4 nm)/Ni0.81Fe0.19 (3 nm) bilayer heterostructures. A monotonically decreasing out-of-plane linewidth was displayed as the sputtering rates increased from 0.27 to 1.75 angstrom/s due to interdiffusion. Meanwhile, a large reduction of the in-plane linewidth from 18.54 to 7.83 mT was also obtained from suppressing the interfacial inhomogeneity and two-magnon scattering effects. The present work contributes to a clearer understanding of Cu/ Ni0.81Fe0.19 nanoscale films' interfacial inhomogeneity and opens a new road on tailoring magnetodynamic properties.

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GB/T 7714 Li, Yaojin , Li, Chunlei , Lu, Qi et al. Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni0.81Fe0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2021 , 125 (43) : 24025-24031 .
MLA Li, Yaojin et al. "Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni0.81Fe0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer" . | JOURNAL OF PHYSICAL CHEMISTRY C 125 . 43 (2021) : 24025-24031 .
APA Li, Yaojin , Li, Chunlei , Lu, Qi , Du, Qin , Shi, Keqing , Hu, Zhongqiang et al. Monotonically Decreasing Ferromagnetic Resonance Linewidth of Cu/Ni0.81Fe0.19 Bilayer Heterostructures with the Increasing Sputtering Rate of the Cu Layer . | JOURNAL OF PHYSICAL CHEMISTRY C , 2021 , 125 (43) , 24025-24031 .
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Mode control by rearrangement of the slow wave structure in a 12-cavity relativistic magnetron with diffraction output using single-stepped cavities driven by a transparent cathode EI SCIE
期刊论文 | 2021 , 11 (3) | AIP Advances
WoS CC Cited Count: 1
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We present the design of an agile slow wave structure for a 'crab-like'A12 relativistic magnetron with diffraction output using single-stepped cavities. By regrouping the interaction region as three sets of four cavities, the TE31 operating mode is generated at 2.60 GHz with 1.0 GW output power for an applied voltage of U = 350 kV and a magnetic field of B = 0.34 T. By regrouping the interaction region as four sets of three cavities, the TE41 operating mode is generated at 2.82 GHz with 1.0 GW output power for an applied voltage of U = 355 kV and a magnetic field of B = 0.36 T. Furthermore, by regrouping the interaction region as six sets of two cavities, the TE31 mode and the TE21 mode are generated. When an applied voltage of U = 350 kV and a magnetic field of B = 0.33 T are used, its output power can be as high as 1.0 GW for the TE31 mode operating at 2.5 GHz. In addition, when an applied voltage of U = 350 kV and a magnetic field of B = 0.42 T are used, its output power can be as high as 1.0 GW with operating mode TE21 at 2.62 GHz. It was found that the rearrangement of the slow wave structure can control the operating mode and, at the same time, lower the operating condition of the beam/wave interaction compared to the traditional 12-cavity relativistic magnetron. The result suggests that this configuration is favorable for mode switching through mechanical rearrangement of the slow wave structure. This work seeks to design a compact high power microwave source for a narrowband directed microwave beam that is suitable for mode switching investigations. © 2021 Author(s).

Keyword :

Magnetrons Microwaves Magnetic fields Diffraction Slow wave structures

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GB/T 7714 Li, Y , Liu, M , Liu, C et al. Mode control by rearrangement of the slow wave structure in a 12-cavity relativistic magnetron with diffraction output using single-stepped cavities driven by a transparent cathode [J]. | AIP Advances , 2021 , 11 (3) .
MLA Li, Y et al. "Mode control by rearrangement of the slow wave structure in a 12-cavity relativistic magnetron with diffraction output using single-stepped cavities driven by a transparent cathode" . | AIP Advances 11 . 3 (2021) .
APA Li, Y , Liu, M , Liu, C , Feng, J , Schamiloglu, E , Fuks, M.I et al. Mode control by rearrangement of the slow wave structure in a 12-cavity relativistic magnetron with diffraction output using single-stepped cavities driven by a transparent cathode . | AIP Advances , 2021 , 11 (3) .
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Operating characteristics of a clamp klystron oscillator with a sloping cavity at W-band EI SCIE
期刊论文 | 2020 , 10 (4) | AIP ADVANCES | IF: 1.548
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We present the design of an oscillator that is an evolution of our previously proposed "clamp klystron." In this new embodiment, we utilize sloping cavities and increase the operating frequency to 94 GHz and 100 GHz (W-band). In this study, we utilized the UNIPIC particle-in-cell code. Simulations confirmed that this new oscillator with one sloping "buncher" cavity and one sloping "catcher" cavity with an inclination angle of 5 degrees and shaped like a "clamp" produces 700 kW output power with an efficiency of 7.1% at 94 GHz when powered using an applied voltage U = 90 kV and beam current 110 A. When one sloping "buncher" cavity and one sloping "catcher" cavity are utilized with an inclination angle of 15 degrees, the oscillator produces 270 kW output power with 3.0% efficiency at 100 GHz when powered using the same electron beam parameters. If two oscillators with sloping cavities along the z-axis are combined serially, then the output power can be as high as 800 kW with 8.0% efficiency at 100 GHz. This new oscillator design can be a promising approach to high power millimeter wave source designs at W-band and higher frequencies.

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GB/T 7714 Liu, M. , Li, Y. , Schamiloglu, E. et al. Operating characteristics of a clamp klystron oscillator with a sloping cavity at W-band [J]. | AIP ADVANCES , 2020 , 10 (4) .
MLA Liu, M. et al. "Operating characteristics of a clamp klystron oscillator with a sloping cavity at W-band" . | AIP ADVANCES 10 . 4 (2020) .
APA Liu, M. , Li, Y. , Schamiloglu, E. , Feng, J. , Liu, C. , Fuks, M., I et al. Operating characteristics of a clamp klystron oscillator with a sloping cavity at W-band . | AIP ADVANCES , 2020 , 10 (4) .
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Self-assembled La0.67Sr0.33MnO3 epitaxial nanocolumn films towards future flexible spintronic devices EI SCIE Scopus
期刊论文 | 2020 , 13 | MATERIALS TODAY PHYSICS | IF: 9.298
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Flexible epitaxial magnetic oxide nanostructures with different electric and magnetic characteristics have attracted intensive explorations because of the potential applications in compact flexible devices. However, either expensive equipment or complicated processing is often indispensable in the traditional fabrication technology. Besides, there still lacks the report on high-quality metallic or half-metallic oxide nanocolumn arrays integrated on flexible substrates, which is one of the most important part in the future all-oxide nanostructure-based flexible spintronics. Herein, we demonstrate a spontaneous formation method to fabricate the epitaxial La0.67Sr0.33MnO3 nanocolumn films on flexible mica substrates with an SrTiO3 buffer layer. The morphology and density of the nanoscale columns can be easily tuned by changing the film thickness, which in turn influences the magnetic properties of the film. Under different levels of bending, the films exhibit morphology-dependent performance during the ferromagnetic resonance measurements. This study provides a viable route of fabricating tunable nanostructures for flexible spintronic devices with optimized performances. (C) 2020 Elsevier Ltd. All rights reserved.

Keyword :

Ferromagnetic resonance Flexible electronics Epitaxial oxide thin film Magnetism

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GB/T 7714 Li, J. , Wu, J. , Shen, L. et al. Self-assembled La0.67Sr0.33MnO3 epitaxial nanocolumn films towards future flexible spintronic devices [J]. | MATERIALS TODAY PHYSICS , 2020 , 13 .
MLA Li, J. et al. "Self-assembled La0.67Sr0.33MnO3 epitaxial nanocolumn films towards future flexible spintronic devices" . | MATERIALS TODAY PHYSICS 13 (2020) .
APA Li, J. , Wu, J. , Shen, L. , Yang, J. , Lu, L. , Cao, C. et al. Self-assembled La0.67Sr0.33MnO3 epitaxial nanocolumn films towards future flexible spintronic devices . | MATERIALS TODAY PHYSICS , 2020 , 13 .
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Preface EI SCIE Scopus
期刊论文 | 2019 , 383 (36) | PHYSICS LETTERS A
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GB/T 7714 Liu, Ming , Zhou, Ziyao , Hu, Zhonggiang . Preface [J]. | PHYSICS LETTERS A , 2019 , 383 (36) .
MLA Liu, Ming et al. "Preface" . | PHYSICS LETTERS A 383 . 36 (2019) .
APA Liu, Ming , Zhou, Ziyao , Hu, Zhonggiang . Preface . | PHYSICS LETTERS A , 2019 , 383 (36) .
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A "crab-like" 12-cavity relativistic magnetron with diffraction output driven by a transparent cathode EI SCIE Scopus
期刊论文 | 2019 , 26 (10) | PHYSICS OF PLASMAS
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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We present computer simulations of a "crablike" 12 resonator cavity relativistic magnetron with diffraction output (MDO) designed by doubling the number of cavities from our earlier 6 resonator cavity crablike MDO. This work aims to design a compact high-power narrowband microwave source with frequency switching capabilities. UNIPIC particle-in-cell computer simulations show that the crablike 12-cavity MDO with a transparent cathode radiates the TE11 mode with output power 1GW and electronic efficiency as high as 41% when powered using a 400 kV voltage pulse and 0.41 T magnetic field. Computer simulations also demonstrate that the crablike 12-cavity MDO can radiate different modes, such as the TE21 mode, the TE31 mode, the TE41 mode, and the TE51 mode. The TE21 mode, in particular, can be radiated at three different frequencies, as low as 2.12 GHz, a median operating frequency of 2.4 GHz, and a higher operating frequency of 2.91 GHz, when different magnetic fields are used. Published under license by AIP Publishing.

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GB/T 7714 Liu, M. , Yang, Q. , Schamiloglu, E. et al. A "crab-like" 12-cavity relativistic magnetron with diffraction output driven by a transparent cathode [J]. | PHYSICS OF PLASMAS , 2019 , 26 (10) .
MLA Liu, M. et al. "A "crab-like" 12-cavity relativistic magnetron with diffraction output driven by a transparent cathode" . | PHYSICS OF PLASMAS 26 . 10 (2019) .
APA Liu, M. , Yang, Q. , Schamiloglu, E. , Feng, J. , Teng, Y. , Fuks, M. I. et al. A "crab-like" 12-cavity relativistic magnetron with diffraction output driven by a transparent cathode . | PHYSICS OF PLASMAS , 2019 , 26 (10) .
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Shape-induced anisotropy in epitaxial Fe3O4 nanopillars EI SCIE Scopus
期刊论文 | 2019 , 383 (27) | PHYSICS LETTERS A
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Fe3O4 nanopillars with remarkably high uniformity and crystallinity are grown on (100)-oriented magnesium aluminate substrates by pulsed laser deposition with a simple anodic-aluminum-oxide template method. Compared with Fe3O4 full film, the nanopillars exhibit higher in-plane magnetic saturation field and lower out-of-plane saturation field. The angular-dependent ferromagnetic resonance, investigated by electron spin resonance spectroscopy, confirms the shape-induced anisotropy change in Fe3O4 nanopillars. High Gilbert damping parameter of 0.23 is obtained by measuring the resonance field at different microwave frequencies. (C) 2019 Published by Elsevier B.V.

Keyword :

Shape anisotropy AAO template Ferromagnetic resonance Fe3O4 nanopillars

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GB/T 7714 Guan, M. , Dong, G. , Hu, Z. et al. Shape-induced anisotropy in epitaxial Fe3O4 nanopillars [J]. | PHYSICS LETTERS A , 2019 , 383 (27) .
MLA Guan, M. et al. "Shape-induced anisotropy in epitaxial Fe3O4 nanopillars" . | PHYSICS LETTERS A 383 . 27 (2019) .
APA Guan, M. , Dong, G. , Hu, Z. , Peng, B. , He, Y. , Cui, W. Z. et al. Shape-induced anisotropy in epitaxial Fe3O4 nanopillars . | PHYSICS LETTERS A , 2019 , 383 (27) .
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Linear Anisotropic Magnetoresistive Sensor Without Barber-Pole Electrodes EI SCIE Scopus
期刊论文 | 2019 , 40 (6) , 969-972 | IEEE ELECTRON DEVICE LETTERS
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Traditional anisotropic magnetoresistive (AMR) sensors used barber-pole electrodes to rotate the current direction by 45 degrees in order to obtain a linear electrical response. However, the adoption of barber-pole electrodes reduced the working area of the sensor. Moreover, the traditional AMR sensors need large-flipping stripes or permanent magnets for stabilization of the magnetization. Here, we report the AMR sensor using an antiferromagnetic layer to regulate the magnetization-current angle. The proposed sensor, without consuming extra area and power, could fully use the magnetoresistive area, and the stabilized magnetization could help in suppressing magnetic noise, enhancing stability, and improving linearity. The presented sensor has a stable response with a disturbing field of -1.5 T, while the commercial sensors need to be reset after being exposed to a small disturbing field of 5 Oe.

Keyword :

antiferromagnetic magnetic sensor exchange bias Anisotropic magnetoresistance

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GB/T 7714 Su, Wei , Wang, Zhiguang , Wen, Tao et al. Linear Anisotropic Magnetoresistive Sensor Without Barber-Pole Electrodes [J]. | IEEE ELECTRON DEVICE LETTERS , 2019 , 40 (6) : 969-972 .
MLA Su, Wei et al. "Linear Anisotropic Magnetoresistive Sensor Without Barber-Pole Electrodes" . | IEEE ELECTRON DEVICE LETTERS 40 . 6 (2019) : 969-972 .
APA Su, Wei , Wang, Zhiguang , Wen, Tao , Hu, Zhongqiang , Wu, Jingen , Zhou, Ziyao et al. Linear Anisotropic Magnetoresistive Sensor Without Barber-Pole Electrodes . | IEEE ELECTRON DEVICE LETTERS , 2019 , 40 (6) , 969-972 .
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Strategies to achieve high performance piezoelectric nanogenerators EI Scopus SCIE
期刊论文 | 2019 , 55 , 288-304 | Nano Energy | IF: 16.602
WoS CC Cited Count: 72 SCOPUS Cited Count: 79
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© 2018 Elsevier Ltd Piezoelectric nanogenerators have attracted much attention in the past decade. In this study, the development of piezoelectric nanogenerators and their progress toward high power generation is discussed. The characteristics and application range of numerous types of piezoelectric nanogenerators are also considered. In addition, several strategies that may improve the performance of piezoelectric nanogenerators are summarized. Here, we compare the open circuit voltages and short circuit currents of various piezoelectric nanogenerators under different factors, and the current problems of piezoelectric nanogenerators are also discussed. Finally, the future prospects and directions of piezoelectric nanogenerators are predicted. Future studies should be focused on the production of high-performance materials, the establishment of working principle and simulation model, the integration of nanogenerator, and the design of the energy harvesting circuit. Hence, it is emergency to search for functional materials with high piezoelectricity and further improve the electromechanical properties of existing piezoelectric materials. Moreover, further research is needed to increase the stability and flexibility of composite materials, to develop wearable and embedded flexible functional devices based on the biocompatibility of inorganic nanoparticles, and to supply power for microelectronic systems.

Keyword :

BaTiO3 Chemical doping Composite thin film materials Nanostructure Piezoelectric nanogenerators PVDF

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GB/T 7714 Hu, Dengwei , Yao, Minggang , Fan, Yong et al. Strategies to achieve high performance piezoelectric nanogenerators [J]. | Nano Energy , 2019 , 55 : 288-304 .
MLA Hu, Dengwei et al. "Strategies to achieve high performance piezoelectric nanogenerators" . | Nano Energy 55 (2019) : 288-304 .
APA Hu, Dengwei , Yao, Minggang , Fan, Yong , Ma, Chunrui , Fan, Mingjin , Liu, Ming . Strategies to achieve high performance piezoelectric nanogenerators . | Nano Energy , 2019 , 55 , 288-304 .
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Electric field-tailored giant transformation of magnetic anisotropy and interfacial spin coupling in epitaxial gamma '-Fe4N/Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3(011) multiferroic heterostructures EI SCIE Scopus
期刊论文 | 2019 , 7 (28) , 8537-8545 | JOURNAL OF MATERIALS CHEMISTRY C
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Electric-field control of magnetization is imperatively desired in spintronic devices with high speed, low energy exhaust and small size. Herein, electric-field control of magnetization and the ferromagnetic resonance field was achieved in the epitaxial gamma'Fe4N/PMN-PT [Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3(011)] heterostructures. At an electric field of +10 kV cm(-1), remanent magnetization with a change as large as similar to 900 emu cm(-3) was observed, together with a tunable ferromagnetic resonance field of 700 Oe. Moreover, nonvolatile control of magnetic anisotropy was also realized. The magnetoelectric coupling (MEC) achieved in this study can be ascribed to the spin-dependent screening effect. In addition, remarkable negative damping appears in the high-frequency measurement. These results provide a new platform for greatly enhancing the MEC in properly designed FM/FE heterostructures.

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GB/T 7714 Lai, Zhengxun , Li, Chunlei , Li, Zirun et al. Electric field-tailored giant transformation of magnetic anisotropy and interfacial spin coupling in epitaxial gamma '-Fe4N/Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3(011) multiferroic heterostructures [J]. | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (28) : 8537-8545 .
MLA Lai, Zhengxun et al. "Electric field-tailored giant transformation of magnetic anisotropy and interfacial spin coupling in epitaxial gamma '-Fe4N/Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3(011) multiferroic heterostructures" . | JOURNAL OF MATERIALS CHEMISTRY C 7 . 28 (2019) : 8537-8545 .
APA Lai, Zhengxun , Li, Chunlei , Li, Zirun , Liu, Xiang , Zhou, Ziyao , Mi, Wenbo et al. Electric field-tailored giant transformation of magnetic anisotropy and interfacial spin coupling in epitaxial gamma '-Fe4N/Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3(011) multiferroic heterostructures . | JOURNAL OF MATERIALS CHEMISTRY C , 2019 , 7 (28) , 8537-8545 .
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