Haodong Fan

Hangzhou Dianzi University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Birui Wu

Hangzhou Dianzi University

Tiejun Zhou

Hangzhou Dianzi University

Menghao Jin

Hangzhou Dianzi University

Zhongshu Feng

Hangzhou Dianzi University

Changqiu Yu

Hangzhou Dianzi University

Wei Xing

Changchun Institute of Applied Chemistry

Hai Li

Hangzhou Dianzi University

Yanshan Zhuang

Hangzhou Dianzi University

Tonghui Cai

China University of Petroleum, East China

Jiahong Wen

Hangzhou Dianzi University

Cooperative Institutions

Chinese Academy of Sciences

China University of Petroleum, East China

Hangzhou Dianzi University

Huazhong University of Science and Technology

Tsinghua University

China University of Petroleum, Beijing

State Key Laboratory of Heavy Oil

University of Chinese Academy of Sciences

Wuhan University of Technology

Taiyuan University of Technology

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Enhancement of damping-like field and field-free switching in Co/Pt bilayer films through quantitative engineering of anisotropy gradient

Applied Physics Letters (2022)

Haodong Fan Yongming Luo Birui Wu Xiuyuan Xu Yanshan Zhuang

Spin–orbit torque (SOT) is an emerging candidate for electrically controlled magnetization switching in low-power and nonvolatile spintronic devices. However, SOT switching of perpendicular magnetization requires an auxiliary field or additional lateral symmetry breaking, which is difficult to achieve in practical applications. In particular, the mechanism of field-free switching through vertical symmetry breaking still lacks a quantitative description. In this work, a vertically asymmetric Co/Pt bilayer has been constructed through quantitative engineering of anisotropy gradient, while keeping the total magnetic thickness of the bilayer constant. Interestingly, the enhanced asymmetry with greater anisotropy gradient would induce higher SOT efficiencies and larger field-free switching ratios. Field-free switching can be attributed to the slight lateral asymmetry caused by the perpendicular anisotropy gradient. The SOT effective-field enhancement and field-free switching through quantitative engineering of the anisotropy gradient not only offer a deeper understanding of current-induced magnetization switching in perpendicularly asymmetric systems but also provide a potential avenue for practical applications of SOT devices at the wafer level.

Switching time

10.1063/5.0088548

Cite

Citations (4)

High-Precision Probabilistic Imaging for Interface Debonding Monitoring Based on Electromechanical Impedance

AIAA Journal (2022)

Fei Du Guanghao Wang Jiexin Weng Haodong Fan Chao Xu

Solid rocket motors (SRMs) are widely used in the aerospace and missile industries. The interface debonding between propellant/insulator/case determines the life of an SRM. Therefore, monitoring and further locating interface debonding are crucial to prevent catastrophic structural failures of an SRM. The electromechanical impedance (EMI) technique based on piezoelectric wafer transducers is a simple and sensitive structural health monitoring (SHM) method. In this study, a high-precision probabilistic imaging method of EMI for the debonding monitoring of the SRM case–insulator interface is proposed. In this method, the Gaussian window function is used to describe the variation of debonding damage index with the position. In addition, an experimental procedure based on simulated damage is presented to determine the parameter in the Gaussian window function. Finite element models of the steel case–insulator structure based on Rayleigh damping are established to analyze the effects of debonding and simulated damage on EMI signals. An experiment is conducted to verify the proposed probabilistic imaging method and the finite element analysis results. It is proved that the proposed probability method can achieve high-precision imaging of debonding of SRM case–insulator, even after several months of storage.

Structural Health Monitoring

10.2514/1.j061577

Cite

Citations (3)

A Static Tin–Manganese Battery with 30000-Cycle Lifespan Based on Stabilized Mn³⁺/Mn²⁺ Redox Chemistry

ACS Nano (2023)

Xuejin Li Yongchao Tang Cuiping Han Zhiquan Wei Haodong Fan

High-potential Mn3+/Mn2+ redox couple (>1.3 V vs SHE) in a static battery system is rarely reported due to the shuttle and disproportionation of Mn3+ in aqueous solutions. Herein, based on reversible stripping/plating of the Sn anode and stabilized Mn2+/Mn3+ redox couple in the cathode, an aqueous Sn-Mn full battery is established in acidic electrolytes. Sn anode exhibits high deposition efficiency, low polarization, and excellent stability in acidic electrolytes. With the help of H+ and a complexing agent, a reversible conversion between Mn2+ and Mn3+ ions takes place on the graphite surface. Pyrophosphate ligand is initially employed to form a protective layer through a complexation process with Sn4+ on the electrode surface, effectively preventing Mn3+ from disproportionation and hindering the uncontrollable diffusion of Mn3+ to electrolytes. Benefiting from the rational design, the full battery delivers satisfied electrochemical performance including a large capacity (0.45 mAh cm-2 at 5 mA cm-2), high discharge plateau voltage (>1.6 V), excellent rate capability (58% retention from 5 to 30 mA cm-2), and superior cycling stability (no decay after 30 000 cycles). The battery design strategy realizes a robustly stable Mn3+/Mn2+ redox reaction, which broadens research into ultrafast acidic battery systems.

10.1021/acsnano.3c00242

Cite

Citations (24)

Polycyclic Aromatic Hydrocarbons as a New Class of Promising Cathode Materials for Aluminum‐Ion Batteries

Angewandte Chemie International Edition (2021)

Dongqing Kong Tonghui Cai Haodong Fan Haoyu Hu Xiaohui Wang

As an emerging post-lithium battery technology, aluminum ion batteries (AIBs) have the advantages of large Al reserves and high safety, and have great potential to be applied to power grid energy storage. But current graphite cathode materials are limited in charge storage capacity due to the formation of stage-4 graphite-intercalated compounds (GICs) in the fully charged state. Herein, we propose a new type of cathode materials for AIBs, namely polycyclic aromatic hydrocarbons (PAHs), which resemble graphite in terms of the large conjugated π bond, but do not form GICs in the charge process. Quantum chemistry calculations show that PAHs can bind AlCl4- through the interaction between the conjugated π bond in the PAHs and AlCl4-, forming on-plane interactions. The theoretical specific capacity of PAHs is negatively correlated with the number of benzene rings in the PAHs. Then, under the guidance of theoretical calculations, anthracene, a three-ring PAH, was evaluated as a cathode material for AIBs. Electrochemical measurements show that anthracene has a high specific capacity of 157 mAh g-1 (at 100 mA g-1 ) and still maintains a specific capacity of 130 mAh g-1 after 800 cycles. This work provides a feasible "theory guides practice" research model for the development of energy storage materials, and also provides a new class of promising cathode materials for AIBs.

10.1002/anie.202114681

Cite

Citations (61)

Elucidating the role of an Ir insertion layer in mediating interfacial perpendicular anisotropy, Dzyaloshinskii-Moriya interaction, and spin-orbit torque in Pt/Ir/Co

Physical review. B./Physical review. B (2023)

Haodong Fan Ziji Shao Jiale Wang Menghao Jin Birui Wu

The advancement of spin-orbit torque (SOT)-based spintronic devices hinges on the ability to optimize interfacial spin-orbit coupling phenomena. This work elucidates the modulation of key spintronic parameters by inserting an Ir layer at Pt/Co and PtCr/Pt(0.5)/Co interfaces. A comprehensive investigation into the thickness-dependent perpendicular magnetic anisotropy, Dzyaloshinskii-Moriya interaction, spin-orbit torque efficiency, and switching current density is undertaken. The results reveal that an ultrathin 0.1 nm Ir insertion layer can enhance the dampinglike SOT efficiency by over 26% in Pt/Co and 10% in PtCr/Co systems, attributed to increased interfacial impurity scattering. Strikingly, the magnetic anisotropy and Dzyaloshinskii-Moriya interaction exhibit a nonmonotonic relationship with Ir thickness, minimized at 0.4--0.5 nm, explained by interfacial roughness effects evidenced through first-principles calculations. The critical switching current density becomes widely tunable from $1.6--3.5\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $({\text{A/cm}}^{2})$ in Pt/Ir/Co and $1.0--2.0\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $({\text{A/cm}}^{2})$ in PtCr/Ir/Co, respectively, reduced by nearly 50% with a 0.4 nm Ir insertion. These findings provide significant physical insights into interfacial spin-orbit coupling mechanisms and interface engineering of spintronic devices using insertion layers. The capability to substantially increase SOT efficiency while reducing the switching current highlights the promise of an Ir insertion layer to unlock the full potential of SOT-MRAM technology.

Spin–orbit interaction

10.1103/physrevb.108.224409

Cite

Citations (1)

Influence mechanism of additives on the crystal structure and desulfurization performance of magnesium slag

Journal of Material Cycles and Waste Management (2021)

Li Jia Fei Wang Zepeng Li Jin-rong Guo Yongqiang Zhang

Slag (welding)

Crystal (programming language)

10.1007/s10163-021-01200-z

Cite

Citations (7)

Research on construction of learner portrait based on learning analytics technology

Yan Zhou Haodong Fan

With the development of big data, artificial intelligence, and wearable technology, the data generated by learners in the learning process can be fully recorded and stored. Using these data to study the characteristics of different types of learners and provide them with precise and personalized learning guidance is an urgent problem to be solved. This paper proposes a learner portrait construction method based on learning analysis technology. Firstly, the case frame relationship with "learning" as the central verb is established by using case grammar. Secondly, constructing a "learning-learner" feature layer with 6 sub-layers through qualitative analysis, and organizing the primary data of learners into 6 kinds of integrated data with specific meanings. Then, two methods of classifying learner types, cluster analysis and standard establishment, are proposed. Finally, giving an example of learner portrait construction.

Learning Analytics

10.1117/12.2673049

Cite

Citations (0)

Field free switching through bulk spin-orbit torque in L10-FePt films deposited on vicinal substrates

arXiv (Cornell University) (2022)

Yongming Luo Yanshan Zhuang Zhongshu Feng Haodong Fan Birui Wu

L10-FePt distinguishes itself for its ultrahigh perpendicular magnetic anisotropy (PMA), which enables memory cells with sufficient thermal stability to scale down to 3 nm. The recently discovered "bulk" spin-orbit torques in L10-FePt provide an efficient and scalable way to manipulate the L10-FePt magnetization. However, the existence of external field during the switching limits its practical application, and therefore field-free switching of the L10-FePt is in highly demand. In this manuscript, we demonstrate the field-free switching of the L10-FePt by growing it on vicinal MgO (001) substrates. This method is different from previously established strategies, as it does not need to add other functional layers or create asymmetry in the film structure. We demonstrate the field-free switching is robust and can withstand strong field disturbance up to ~1 kOe. The dependence on vicinal angle, film thickness, and growth temperature demonstrated a wide operation window for the field-free switching of the L10-FePt. We confirmed that the physical origin of the field-free switching is the vicinal surface-induced the tilted anisotropy of L10-FePt. We quantitatively characterize the spin-orbit torques in the L10-FePt films, and found the spin-orbit torques are not significantly influenced by the lattice strain from vicinal substrates. Our results extend beyond the established strategies to realize field-free switching, and potentially could be applied to other magnetic and antiferromagnetic systems.

Vicinal

Magnetoresistive random-access memory

10.48550/arxiv.2203.06921

Cite

Citations (0)

Research on the interaction mechanism between textile dyeing sludge and biomass components during high-temperature co-pyrolysis

Fuel (2024)

Jinjiao Zhu Jiaheng Yang Yongsheng Fan Han Zhang Haodong Fan

Textile

10.1016/j.fuel.2024.132156

Cite

Citations (1)