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Runwei Li

Prof. Run-Wei Li is the Founding Director of Key Laboratory of Magnetic Materials and Devices, Chinese Academy of Sciences (CAS). After obtaining his Ph.D. from Institute of Physics (IOP), CAS in 2002, Prof. Li served as the Japan Society for the Promotion of Science (JSPS) research fellow in Osaka University, Japan (2002-2003); Humboldt Fellow in Kaiserslautern University, Germany (2003-2005); Senior Research Fellow in the International Center for Young Scientists, National Institute for Materials Sciences, Japan (2005-2008). In 2008, he joined the Ningbo Institute of Materials Technology and Engineering (NIMTE), CAS, as a full-time professor.

His research interests focus on flexible magnetic and electronic materials and devices for new storage and sensing technology, including flexible or elastic electronic materials and sensors, Resistive Random Access Memory (RRAM) materials, physics and devices, etc. He discovered the anomalous large anisotropic magnetoresistance effect in manganese oxide and the room temperature conductance quantization effect in RRAM devices, and designed and developed elastic wires and electrodes, intrinsic elastic ferroelectrics, elastic magnetic sensors, elastic stress and strain sensors, etc.

Prof. Li has published more than 300 journal articles and edited two monographs, holds more than 140 authorized patents. Currently, he serves as a Member of the Asian Union of Magnetics Societies (AUMS) Council, the Senior Member of the Institute of Electrical and Electronics Engineers (IEEE), the Fellow of the Chinese Institute of Electronics (CIE), the Vice Chairman of the Applied Magnetics Committee of the CIE and the Magnetics Committee of the Chinese Physical Society (CPS), the Editorial Board Member of Sensors and Journal of Semiconductors.


Flexible electric/magnetic functional materials and devices

Run-Wei Li

Chinese Academy of Sciences Key Laboratory of Magnetic Materials and Devices，

Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences

Abstract

The rapid development of IoT, wearable and implantable technology has put forward an urgent demand for flexible electronic devices. Flexible electronic systems mainly include flexible circuits, sensors and memories that are used for the perception, transmission and storage of signals such as movement and physiological signs. The basic units of electronic components include resistors, capacitors, inductors, transistors, etc., as conductive materials, dielectric materials, and functional materials (semiconductors, magnetics, ferroelectric materials, etc.) are the basics that make up the device unit, their flexibility strategies have attracted widespread attention.

This talk focuses on our research work in flexible/elastic conductive, ferroelectric, magnetic materials and sensors. In terms of elastic conductive materials and devices, we have obtained elastic conductive materials with high conductivity and stability under high strain based on room-temperature liquid metal materials [1,2], we developed prototype devices such as elastic heaters, elastic strain sensors, and bionic pain receptors [3,4], and developed practical elastic wires and elastic strain sensors. In terms of elastic ferroelectric materials, the idea of using chemical crosslinking method to make organic plastic PVDF-based copolymers have intrinsic elasticity is proposed, and ferroelectric materials with intrinsic elasticity are synthesized for the first time by finely adjusting the crosslinking reaction [5]. In terms of flexible magnetic functional materials and devices, the quantitative regulation law of stress on magnetic anisotropy of flexible magnetic film was revealed [6,7], the strategies of maintaining magnetic anisotropy stability under stress of flexible magnetic film was proposed [8,9], and super-elastic spin valve magnetic sensor, three-dimensional force sensor, digital bionic tactile sensor, etc. were prepared with anti-tensile interference [10-13]. These results have laid a good foundation for the application of flexible electric/magnetic functional devices in human-computer interaction, health monitoring and other fields.

References

[1] Jinwei Cao, Fei Liang, Huayang Li, et al., Guang Zhu*, Run-Wei Li*. Ultra-robust stretchable electrode for e-skin: In situ assembly using a nanofiber scaffold and liquid metal to mimic water-to-net interaction. Info Mat. 4, e12302 (2022).

[2] Zidong He, et al., Guang Zhu*, Run-Wei Li*. Highly stretchable, deformation-stable wireless powering antenna for wearable electronics. Nano Energy 112, 108461 (2023).

[3] Zhe Yu, Wu Bin Ying, et al., Ruoyu Zhang*, Jie Shang*, Run-Wei Li*. Stretchable Tactile Sensor with High Sensitivity and Dynamic Stability Based on Vertically Aligned Urchin-shaped Nanoparticles. Materials Today Physics 14, 100219 (2020).

[4] Fali Li, et al., Yiwei Liu*, Run-Wei Li*. Bio-Inspired Multi-Mode Pain-Perceptual System (MMPPS) with Noxious Stimuli Warning, Damage Localization, and Enhanced Damage Protection. Advanced Science 2004208 (2021).

[5] Liang Gao, Ben-Lin Hu*, et al., Run-Wei Li*. Intrinsically elastic polymer ferroelectric by precise slight crosslinking. Science 381,540 (2023).

[6] Xingcheng Wen, Baomin Wang*, et al., Run-Wei Li*. Determination of stress-coefficient of magnetoelastic anisotropy in flexible amorphous CoFeB film by anisotropic magnetoresistance. Appl. Phys. Lett. 111, 142403 (2017).

[7] Ping Sheng, Yali Xie, Yuhao Bai, Baomin Wang*, et al., Run-Wei Li*. Magnetoelastic anisotropy of antiferromagnetic materials. Appl. Phys. Lett. 115, 242403 (2019).

[8] Xinyu Qiao, Xingcheng Wen, Baomin Wang*, et al., Xiaohong Xu*, Run-Wei Li*. Enhanced stress-invariance of magnetization direction in magnetic thin films. Appl. Phys. Lett. 111, 132405 (2017).

[9] Mengchao Li, Huali Yang,* Yali Xie,* et al., Run-Wei Li*. Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy. Nano Letters. 23, 8073–8080 (2023).

[10] Huihui Li, Qingfeng Zhan*, et al., Run-Wei Li*. Stretchable Spin Valve with Stable Magnetic Field Sensitivity by Ribbon-Patterned Periodic Wrinkles. ACS Nano 4, 4403 (2016).

[11] Yuanzhao Wu, Yiwei Liu*, et al., Run-Wei Li*. A Skin-Inspired Tactile Sensor for Smart Prosthetics. Science Robotics 3, eaat0429 (2018).

[12] Shengbin Li, et al., Denys Makarov*, Run-Wei Li*. Self-powered stretchable strain sensors for motion monitoring and wireless control. Nano Energy 92, 106754 (2022).

[13] Huiyun Xiao, et al., Denys Makarov*, Yiwei Liu*, and Run-Wei Li*. Dual Mode Strain–Temperature Sensor with High Stimuli Discriminability and Resolution for Smart Wearables. Adv. Funct. Mater. 2214907 (2023).