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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 ：
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 ：
Anisotropic magnetoresistance antiferromagnetic exchange bias magnetic sensor
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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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Abstract ：
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 ：
AAO template Fe3O4 nanopillars Ferromagnetic resonance Shape anisotropy
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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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Abstract ：
Magnonics or spin waves have the potential to serve as the carrier for future information communication. A controllable spin wave resonance (SWR) device is demonstrated in a Au/[DEME](+)[TFSI](-)/LSMO/STO capacitor heterostructure, which could be regulated by ionic liquid gating (ILG) method. The SWR critical angle phi(C), excitation position to perform uniform precession, is shifted in a reversible manner (thus recording "off" and "on") with +1.5 V gating voltage (V-g), measured by quantitative angular dependent electron spin resonance (ESR) spectroscopy. Based on the modified Puszkarski's surface inhomogeneity model, the ILG control SWR at low V-g (V-g < 1.5 V) can be explained by a charge-doping-induced effective surface magnetic anisotropy change. Applying a higher V-g (V-g > 1.5 V) enhances the surface mode SWR and gradually diminishes the body mode SWR. Oxygen vacancies generate at higher V-g (V-g > 1.5 V) resulting in the modulation of superexchange between the Mn ions, evidenced by X-ray photoelectron spectroscopy and secondary ion mass spectroscopy characterization. This ILG control SWR presents a solution for energy efficient and low-voltage control of magnonics and spin wave devices.
Keyword ：
ferromagnetic resonance ionic-liquid gating magnetoelectrics spin waves
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| GB/T 7714 | Zhao, Shishun , Hou, Weixiao , Zhou, Ziyao et al. Ionic Liquid Gating Control of Spin Wave Resonance in La0.7Sr0.3MnO3 Thin Film [J]. | ADVANCED ELECTRONIC MATERIALS , 2019 , 6 (1) . |
| MLA | Zhao, Shishun et al. "Ionic Liquid Gating Control of Spin Wave Resonance in La0.7Sr0.3MnO3 Thin Film" . | ADVANCED ELECTRONIC MATERIALS 6 . 1 (2019) . |
| APA | Zhao, Shishun , Hou, Weixiao , Zhou, Ziyao , Li, Yoojin , Zhu, Mingmin , Li, Haobo et al. Ionic Liquid Gating Control of Spin Wave Resonance in La0.7Sr0.3MnO3 Thin Film . | ADVANCED ELECTRONIC MATERIALS , 2019 , 6 (1) . |
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