A5016194063- Magnetic properties of thin films
- Hydraulic and Pneumatic Systems
- Ferroelectric and Negative Capacitance Devices
- Electric and Hybrid Vehicle Technologies
- Water resources management and optimization
- Quantum and electron transport phenomena
- Semiconductor materials and devices
- Advanced Sensor and Control Systems
- Physics of Superconductivity and Magnetism
- Tribology and Lubrication Engineering
- Industrial Technology and Control Systems
- Gear and Bearing Dynamics Analysis
- Cavitation Phenomena in Pumps
- Robotics and Sensor-Based Localization
- Magnetic Bearings and Levitation Dynamics
- Magnetic and transport properties of perovskites and related materials
- Advanced Vision and Imaging
- Magnetic Properties and Applications
- Advanced Memory and Neural Computing
- Advanced Battery Technologies Research
- Optical measurement and interference techniques
- Magneto-Optical Properties and Applications
- Electronic and Structural Properties of Oxides
- Robotic Mechanisms and Dynamics
- Engineering Applied Research
Southwest Jiaotong University
2009-2023
University of Zurich
2020-2023
South China University of Technology
2021
North China Electric Power University
2017-2020
Shanghai University
2018
Shanghai Institute of Ceramics
2018
Chinese Academy of Sciences
2018
Magnetic random access memories based on the spin transfer torque phenomenon (STT-MRAMs) have become one of leading candidates for next generation memory applications. Among many attractive features this technology are its potential high speed and endurance, read signal margin, low power consumption, scalability, non-volatility. In paper, we discuss our recent results perpendicular STT-MRAM stack designs that show STT efficiency higher than 5 kBT/μA, energy barriers 100 kBT at room...
We present major breakthroughs in MTJ design for STT-MRAM applications allowing reliable write pulse lengths down to 1.5ns, data retention up 125°C 10 years and full compatibility with BEOL process 400°C 1 hour. have successfully integrated the novel structure onto an 8Mbit test chip. demonstrate writing of every single cell array using sub-5ns pulses over a wide temperature range without any error correction. also show that sensing times 4ns are sufficient read cell. The inherent...
Spin-transfer-torque magnetic random access memory (STT-MRAM) is the most promising emerging non-volatile embedded memory. For applications, a wide range of operating temperatures required, for example -40 °C to +150 automotive applications. This presents challenge STT-MRAM, because anisotropy responsible data retention decreases rapidly with temperature. In order compensate loss thermal stability at high temperature, devices must be increased. in turn leads larger write currents lower...
Abstract Perpendicular magnetic anisotropy (PMA) ferromagnetic CoFeB with dual MgO interfaces is an attractive material system for realizing memory applications that require highly efficient, high speed current-induced switching. Using this structure, a sub-nanometer layer has the potential to simultaneously exhibit switching in accordance conservation of spin angular momentum, and thermal stability owing enhanced interfacial PMA arises from two CoFeB-MgO interfaces. However, difficulty...
Current understanding of thermal stability perpendicular STT-MRAM based on device-level data suggests that the factor A is almost independent device diameter above ~30nm. Here we report contrary to this conventional wisdom, chip-level retention exhibits substantial size dependence for diameters between 55 and 100 nm. We show method widely used measure inaccurate devices larger than ~30 nm, leading significant underestimation dependence. derive an improved model, allowing us reconcile...
We present for the first time STT-MRAM devices with ultra low operating voltage and power compatible next generation 0x node logic voltages. By engineering tunnel barrier improving efficiency of we report a record writing 0.17V 1ppm error rate, which has been achieved 20ns write operation using current only 35uA. further demonstrate rates below 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-9</sup> at 0.25V 50uA 10ns pulses on same 30nm...
Water resources are not only the essence of human life, but also an important prerequisite which ensures economic and social development a country or city. Due to chronically global overexploitation, water crises have started emerge. China, for example, is experiencing acute scarcity. Even its capital, Beijing, faces enormous challenges in sustainable use resources. Combining compound system social, economic, ecological environments with current situation this study established evaluation...
Reservoirs play an important role in responding to natural disasters (such as flood and drought) by controlling the runoff. With climate changing, frequency intensity of drought are likely increase. Thus, impact reservoirs on runoff under change needs be studied cope with future floods drought. In this study, Nierji Reservoir located Nenjiang River Basin was chosen explore impact. The Nenjiany is vital water source resources transfer project Northeast China. Climate analyzed using 1980 2013...
Abstract Superconducting high entropy alloys (HEAs) may combine extraordinary mechanical properties with robust superconductivity. They are suitable model systems for the investigation of interplay disorder and Here, we report on superconductivity in (TaNb) 1- x (ZrHfTi) thin films. Beyond near-equimolar region, films comprise hundreds-of-nanometer-sized crystalline grains show bulk However, superconducting transitions these nanocomposites dramatically suppressed configurations, i.e., 0.45...
Abstract The distribution of lubricant flow field inside the two‐stage transmission reducer is very complicated during splash lubrication, which difficult to be visually simulated and analysed using traditional finite element methods (FEM). There are many problems in model processing, algorithm selection, mesh division, computational workload. Through sufficient investigation experimental validation based on literature, moving particle semi‐implicit (MPS) method proposed study lubrication...
Last-Level-Cache applications at 0X technology nodes require devices switching reliably in less than 10ns currents smaller 50uA, while preserving data retention up to 85°C. In this paper, we show that both low Gilbert damping and magnetic moment are the primary factors for efficient writing nanosecond time scales. We report comprehensive device-level measurements of using conventional free layer designs an optimized combines meets LLC requirements.
We systematically investigated the superconducting properties and interplay between charge density waves (CDWs) superconductivity (SC) in lithium-intercalated $2H\text{\ensuremath{-}}\mathrm{Ta}{\mathrm{S}}_{2}$. By gradually increasing lithium content $x$, CDW formation temperature is continuously suppressed, onset of SC increased with a maximum transition ${T}_{c}=3.5\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ for $x=0.096$. The bulk nature confirmed by shielding fraction order unity this...
We systematically investigated the physical properties of amorphous Mo$_{\rm x}$Si$_{1-x}$ films deposited by magnetron co-sputtering technique. The critical temperature $T_C$ x}$ Si$_{1-x}$ increases gradually with stoichiometry x, and highest $T_C$=7.9 K was found in 0.83}$ Si$_{0.17}$. Beyond $x$=0.83, preformed Cooper pairs superconducting domains persist films, despite state perfect zero-resistivity is absent. thick Si$_{0.17}$ show surprising degradation which onset suppressed below 2...
In order to solve the problems of large peak torque and short battery life when city bus starts or accelerates, a new electro-hydrostatic hydraulic hybrid powertrain is designed in this paper that can operate efficiently all speed conditions with certain type electric running Chengdu. The improvement comprehensive energy efficiency power system by switching between different modes under typical operating studied. Through co-simulation AMESim MATLAB/Simulink-stateflow software, vehicle...
Scaling STT-MRAM cells beyond 1X technology nodes will require MTJ devices smaller than 30 nm. For such small sizes, process-induced damage becomes a primary factor of device performance. A robust method assessing magnetic properties sub-30 nm is thus needed. Here we report measurements the anisotropy field H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</sub> down to 20 using ST-FMR. We show that increases for decreasing sizes. The...
Abstract Water shortages and the deterioration of water quality in natural environment have a negative effect on social development many countries. Therefore, optimizing allocation resources has become an important research topic planning management. An essential step improving utilization efficiency is prediction supply demand. Because it great number merits, grey method been widely used population temperature prediction. However, also limitations such as low precision since original data...
We report on the structural and microscopic superconducting properties of ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{AlSi}$ solid solution. Specifically, we have realized continuous solution, which for all members, other than $x=0$ (CaAlSi), crystallizes in ${\mathrm{AlB}}_{2}$-type structure. For CaAlSi, present an improved model where Al/Si layers are buckled, leading to a 6-folded structure along crystallographic $c$ direction. We, furthermore, find indications instability...
Beijing-Tianjin-Hebei is an area with insufficient per capita water resources. This study evaluates the current status and development trend of sustainable use resources in region, identifies specific factors influencing so as to provide a theoretical basis data support for management region. Applying compound system social, economic ecological environment, this established evaluation index system. The obtained through relevant calculations based on National Economic Social Development...