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学者姓名：刘明
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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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Abstract ：
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 ：
Diffraction Magnetic fields Magnetrons Microwaves 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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Abstract ：
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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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 ：
Epitaxial oxide thin film Ferromagnetic resonance Flexible electronics 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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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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Abstract ：
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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| 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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Abstract ：
© 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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Abstract ：
Research on tuning the magnetic anisotropy of magnetic heterostructures has been receiving intensive attentions due to their intriguing tuning phenomena. In particular, tuning the magnetic anisotropy by in situ magnetic field during the fabrication process allows a remarkable control of magnetism with energy efficiency and shows significant potential applications for compact, fast, and low-power microwave and electronic devices. In this paper, in situ external out-of-plane and in-plane magnetic fields were applied during the deposition of Fe3O4 thin films on Pt substrates by atomic layer deposition at different temperatures (350 degrees C, 400 degrees C, and 450 degrees C). The effects of in situ magnetic field with different directions on the surface morphologies and magnetic properties of Fe3O4/Pt heterostructures were characterized. It was found that both the out-of-plane and in-plane external magnetic fields tuned the magnetic anisotropy of ferromagnetic Fe3O4 when deposited at 400 degrees C with the maximum resonance field changes of 620 and 1930 Oe along in-plane and out-of-plane directions, respectively. This paper achieves tuning the magnetic properties through in situ magnetic field and provides a possibility for spintronic devices.
Keyword ：
Atomic layer deposition (ALD) Fe3O4/Pt heterostructures in situ magnetic field magnetic anisotropy
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| GB/T 7714 | Zhang, Le , Zhou, Ziyao , Zhang, Yijun et al. Tuning the Magnetic Anisotropy of Fe3O4/Pt Heterostructures Fabricated by Atomic Layer Deposition With In Situ Magnetic Field [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2019 , 55 (3) . |
| MLA | Zhang, Le et al. "Tuning the Magnetic Anisotropy of Fe3O4/Pt Heterostructures Fabricated by Atomic Layer Deposition With In Situ Magnetic Field" . | IEEE TRANSACTIONS ON MAGNETICS 55 . 3 (2019) . |
| APA | Zhang, Le , Zhou, Ziyao , Zhang, Yijun , Peng, Bin , Ren, Wei , Ye, Zuo-Guang et al. Tuning the Magnetic Anisotropy of Fe3O4/Pt Heterostructures Fabricated by Atomic Layer Deposition With In Situ Magnetic Field . | IEEE TRANSACTIONS ON MAGNETICS , 2019 , 55 (3) . |
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Abstract ：
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Ferromagnetic insulator thin film nanostructures are becoming the key component of the state-of-the-art spintronic devices, for instance, yttrium iron garnet (YIG) with low damping, high Curie temperature, and high resistivity is explored into many spin–orbit interactions related spintronic devices. Voltage modulation of YIG, with great practical/theoretical significance, thus can be widely applied in various YIG-based spintronics effects. Nevertheless, to manipulate ferromagnetism of YIG through electric field (E-field), instead of current, in an energy efficient manner is essentially challenging. Here, a YIG/Cu/Pt layered nanostructure with a weak spin–orbit coupling interaction is fabricated, and then the interfacial magnetism of the Cu and YIG is modified via ionic liquid gating method significantly. A record-high E-field-induced ferromagnetic resonance field shift of 1400 Oe is achieved in YIG (17 nm)/Cu (5 nm)/Pt (3 nm)/ionic liquid/Au capacitor layered nanostructures with a small voltage bias of 4.5 V. The giant magnetoelectric tunability comes from voltage-induced extra ferromagnetic ordering in Cu layer, confirmed by the first-principle calculation. This E-field modulation of interfacial magnetism between light metal and magnetic isolator may open a door toward compact, high-performance, and energy-efficient spintronic devices.
Keyword ：
Cu magnetization ferromagnetic resonance ionic liquid gating magnetoelectric coupling yttrium iron garnet
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| GB/T 7714 | Guan, Mengmeng , Wang, Lei , Zhao, Shishun et al. Ionic Modulation of Interfacial Magnetism in Light Metal/Ferromagnetic Insulator Layered Nanostructures [J]. | Advanced Functional Materials , 2019 , 29 (1) . |
| MLA | Guan, Mengmeng et al. "Ionic Modulation of Interfacial Magnetism in Light Metal/Ferromagnetic Insulator Layered Nanostructures" . | Advanced Functional Materials 29 . 1 (2019) . |
| APA | Guan, Mengmeng , Wang, Lei , Zhao, Shishun , Peng, Bin , Su, Wei , He, Zhexi et al. Ionic Modulation of Interfacial Magnetism in Light Metal/Ferromagnetic Insulator Layered Nanostructures . | Advanced Functional Materials , 2019 , 29 (1) . |
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