Xiaoguang Xu

University of Science and Technology Beijing

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Yong Jiang

Tianjin Polytechnic University

Jun Miao

University of Science and Technology Beijing

Kangkang Meng

University of Science and Technology Beijing

Yong Wu

University of Science and Technology Beijing

Robert M. Reeve

Johannes Gutenberg University Mainz

Jianhua Zhao

Novel (United States)

Jiaxing Xiao

Guizhou Normal University

Shuiqing Li

Zhejiang University

Qiang Yao

Nanjing University of Chinese Medicine

Zhixian Guo

First Affiliated Hospital of Zhengzhou University

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology Beijing

University of Chinese Academy of Sciences

Tsinghua University

Institute of Physics

Institute of Semiconductors

Institute of High Energy Physics

Xi'an Jiaotong University

Wuhan University of Technology

Johannes Gutenberg University Mainz

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Dynamic Behavior of Biomass Ash Deposition in a 25 kW One-Dimensional Down-Fired Combustor

Energy & Fuels (2013)

Gengda Li Shuiqing Li Xiaoguang Xu Qian Huang Qiang Yao

As a CO2-neutral renewable energy, biomass combustion is encouraged to reduce global-warming gas emissions in China. The severe fouling and slagging problem because of high alkali and alkaline earth metal contents still limit the applications of self-sustained biomass power plants. It is essential to study the dynamic behavior of ash deposition in pure biomass combustion. In this paper, three kinds of biomass, saw dust, wheat straw, and corn stover, were burned in a 25 kW one-dimensional down-fired furnace. Three different sampling probe temperatures (550, 600, and 650 °C) and four different sampling time periods were chosen, while the deposited ash mass, collection efficiency, deposition morphology, and deposit composition were studied. The results indicate that the deposition mass, collection efficiency, and deposition area all achieve a minimum at an intermediate temperature of 600 °C. Highly reactive potassium plays an important role in the ash deposition process, causing a higher deposition rate of wheat straw than corn stover. The results under different sampling time periods indicate that the depositing rate exhibits a trend of a "fast–slow–fast–slow" process. Finally, the governing mechanisms are speculated on the basis of the experimental data, such as deposit morphology and elemental composition.

Corn stover

Deposition

10.1021/ef401530a

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Citations (37)

Low-energy Resistive Random Access Memory Devices with No Need for a Compliance Current

Scientific Reports (2015)

Zedong Xu Lina Yu Yong Wu Chang Dong Ning Deng

Abstract A novel resistive random access memory device is designed with SrTiO 3 / La 2/3 Sr 1/3 MnO 3 (LSMO)/MgAl 2 O 4 (MAO)/Cu structure, in which metallic epitaxial LSMO is employed as the bottom electrode rather than traditional metal materials. In this device, the critical external compliance current is no longer necessary due to the high self-resistance of LSMO. The LMSO bottom electrode can act as a series resistor to offer a compliance current during the set process. Besides, the device also has excellent switching features which are originated in the formation of Cu filaments under external voltage. Therefore it provides the possibility of reducing power consumption and accelerating the commercialization of resistive switching devices.

Resistive touchscreen

Random access

10.1038/srep10409

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Citations (28)

Effect of Co-firing Straw with Two Coals on the Ash Deposition Behavior in a Down-Fired Pulverized Coal Combustor^†

Energy & Fuels (2009)

Xiaoguang Xu Shuiqing Li G.-D. Li Qiang Yao

This investigation examines the variation of ash deposit when co-firing wheat straw with both high-kaolinite, low-sulfur YanKuang (YK) coal and low-kaolinite, high-sulfur WenNan (WN) coal at different ratios. The experiment was carried out in a 25 kW lab-scale one-dimensional down-fired combustor, in which a temperature-controlled deposition probe was developed to collect deposit samples for further mass, morphology, or chemical analyses. The measured collection efficiencies are compared to the predicted ones by the "rule of mixtures", assuming no interaction between fuels. A significant increase in ash collection efficiency was observed in the cases of co-firing straw with WN but became insignificant when co-firing straw with YK. The formation of low-melting alkali−aluminum silicates instead of the sulfation of alkali chloride plays an important role in explaining the changing of two typical deposition mechanisms during ash deposition. The straw in blends or in pure streams brings a "shadow effect" that contributes to the increasing deposit height in contrast to pure coal combustion. Finally, the vital role of fine particles as the adhesive or glue between coarse ash residues was verified by scanning electron microscopy (SEM) pictures.

Deposition

Pulverized coal-fired boiler

10.1021/ef900626m

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Citations (50)

Modulated switching current density and spin-orbit torques in MnGa/Ta films with inserting ferromagnetic layers

Scientific Reports (2016)

Kangkang Meng Jun Miao Xiaoguang Xu Yong Wu Jiaxing Xiao

Abstract We report modulated switching current density and spin-orbit torques (SOT) in MnGa/Ta films with inserting very thin Co 2 FeAl and Co layers. Ferromagnetic coupling has been found in MnGa/Co 2 FeAl/Ta, resulting in a decreased effective anisotropy field. On the contrary, in MnGa/Co/Ta, antiferromagnetic coupling plays a dominant role. The switching current density J c in MnGa/Ta is 8.5 × 10 7 A/cm 2 . After inserting 0.8-nm-thick Co 2 FeAl and Co, the J c becomes 5 × 10 7 A/cm 2 and 9 × 10 7 A/cm 2 , respectively. By performing adiabatic harmonic Hall voltage measurements, it is demonstrated that the inserted Co 2 FeAl layer has mainly enhanced the field-like torques, while in MnGa/Co/Ta the damping-like torques have been enhanced. Finally, the enhanced spin Hall effect (SHE) has also been studied using the spin Hall magnetoresistance measurement. The modulated J c and SOT are ascribed to the combination of magnetic coupling, Rashba effect and SHE at the interfaces.

FEAL

10.1038/srep38375

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Citations (33)

Hybrid magnetoresistance in Pt-based multilayers: Effect originated from strong interfacial spin-orbit coupling

Scientific Reports (2016)

Kangkang Meng Jiaxing Xiao Yong Wu Jun Miao Xiaoguang Xu

Abstract The hybrid magnetoresistance (MR) behaviors in Pt/Co 90 Fe 10 /Pt, Mn 1.5 Ga/Pt and Mn 1.5 Ga/Pt/Co 90 Fe 10 /Pt multilayers have been investigated. Both planer Hall effect (PHE) and angle-dependent MR in Pt/Co 90 Fe 10 /Pt revealed the combination of spin Hall MR (SMR) and normal anisotropic MR (AMR), indicating the large contribution of strong spin-orbit coupling (SOC) at the interfaces. When Pt contacted with perpendicular magnetic anisotropy (PMA) metal Mn 1.5 Ga, the strong interfacial SOC modified the effective anomalous Hall effect. The MR in Mn 1.5 Ga/Pt/Co 90 Fe 10 /Pt is not a simple combination of SMR and AMR, but ascribed to the complicated domain wall scattering and strong interfacial SOC when Pt is sandwiched by the in-plane magnetized Co 90 Fe 10 and the PMA Mn 1.5 Ga.

Spin–orbit interaction

10.1038/srep20522

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Ultra-large non-volatile modulation of magnetic moments in PbZr0.2Ti0.8O3/MgO/La0.7Sr0.3MnO3 heterostructure at room temperature via interfacial polarization mediation

Scientific Reports (2017)

Q. Liu Jun Miao Robert M. Reeve Kangkang Meng Xiaoguang Xu

Multiferroic hybrid structures PbZr

10.1038/s41598-017-03019-x

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Strain-mediated electric-field control of exchange bias in a Co90Fe10/BiFeO3/SrRuO3/PMN-PT heterostructure

Scientific Reports (2015)

Shizhe Wu Jun Miao Xiaoguang Xu Wenqi Yan Robert M. Reeve

Abstract The electric-field (E-field) controlled exchange bias (EB) in a Co 90 Fe 10 /BiFeO 3 (BFO)/SrRuO 3 /PMN-PT heterostructure has been investigated under different tensile strain states. The in-plane tensile strain of the BFO film is changed from +0.52% to +0.43% as a result of external E-field applied to the PMN-PT substrate. An obvious change of EB by the control of non-volatile strain has been observed. A magnetization reversal driven by E-field has been observed in the absence of magnetic field. Our results indicate that a reversible non-volatile E-field control of a ferromagnetic layer through strain modulated multiferroic BFO could be achieved at room temperature.

Strain (injury)

10.1038/srep08905

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Citations (52)

Field-free spin-orbit torque switching via out-of-plane spin-polarization induced by an antiferromagnetic insulator/heavy metal interface

Nature Communications (2023)

Mengxi Wang Jun Zhou Xiaoguang Xu Tanzhao Zhang Zhiqiang Zhu

Manipulating spin polarization orientation is challenging but crucial for field-free spintronic devices. Although such manipulation has been demonstrated in a limited number of antiferromagnetic metal-based systems, the inevitable shunting effects from the metallic layer can reduce the overall device efficiency. In this study, we propose an antiferromagnetic insulator-based heterostructure NiO/Ta/Pt/Co/Pt for such spin polarization control without any shunting effect in the antiferromagnetic layer. We show that zero-field magnetization switching can be realized and is related to the out-of-plane component of spin polarization modulated by the NiO/Pt interface. The zero-field magnetization switching ratio can be effectively tuned by the substrates, in which the easy axis of NiO can be manipulated by the tensile or compressive strain from the substrates. Our work demonstrates that the insulating antiferromagnet based heterostructure is a promising platform to enhance the spin-orbital torque efficiency and achieve field-free magnetization switching, thus opening an avenue towards energy-efficient spintronic devices.

10.1038/s41467-023-38550-1

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Citations (28)