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6,088 results on '"Liu, Long"'

213. Room temperature 2D ferromagnetism in few-layered 1$T$-CrTe$_{2}$

Author

Sun, Xingdan, Li, Wanying, Wang, Xiao, Sui, Qi, Zhang, Tongyao, Wang, Zhi, Liu, Long, Li, Da, Feng, Shun, Zhong, Siyu, Wang, Hanwen, Bouchiat, Vincent, Regueiro, Manuel Nunez, Rougemaille, Nicolas, Coraux, Johann, Wang, Zhenhua, Dong, Baojuan, Wu, Xing, Yang, Teng, Yu, Guoqiang, Wang, Bingwu, Han, Zheng Vitto, Han, Xiufeng, and Zhang, Zhidong

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Spin-related electronics using two dimensional (2D) van der Waals (vdW) materials as a platform are believed to hold great promise for revolutionizing the next generation spintronics. Although many emerging new phenomena have been unravelled in 2D electronic systems with spin long-range orderings, the scarcely reported room temperature magnetic vdW material has thus far hindered the related applications. Here, we show that intrinsic ferromagnetically aligned spin polarization can hold up to 316 K in a metallic phase of 1$T$-CrTe$_{2}$ in the few-layer limit. This room temperature 2D long range spin interaction may be beneficial from an itinerant enhancement. Spin transport measurements indicate an in-plane room temperature negative anisotropic magnetoresistance (AMR) in few-layered CrTe$_{2}$, but a sign change in the AMR at lower temperature, with -0.6$\%$ at 300 K and +5$\%$ at 10 K, respectively. This behavior may originate from the specific spin polarized band structure of CrTe$_{2}$. Our findings provide insights into magnetism in few-layered CrTe$_{2}$, suggesting potential for future room temperature spintronic applications of such 2D vdW magnets., Comment: 9 Pages, 4 Figures

Published
2019
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214. BGD-based Adam algorithm for time-domain equalizer in PAM-based optical interconnects

Author

Wang, Haide, Zhou, Ji, Liu, Weiping, Li, Jianping, Huang, Xincheng, Liu, Long, Liang, Weixian, Yu, Changyuan, Li, Fan, and Li, Zhaohui

Subjects
Computer Science - Information Theory
Abstract

To the best of our knowledge, for the first time, we propose adaptive moment estimation (Adam) algorithm based on batch gradient descent (BGD) to design a time-domain equalizer (TDE) for PAM-based optical interconnects. Adam algorithm has been widely applied in the fields of artificial intelligence. For TDE, BGD-based Adam algorithm can obtain globally optimal tap coefficients without being trapped in locally optimal tap coefficients. Therefore, fast and stable convergence can be achieved by BGD-based Adam algorithm with low mean square error. Meanwhile, BGD-based Adam algorithm is implemented by parallel processing, which is more efficient than conventional serial algorithms, such as least mean square and recursive least square algorithms. The experimental results demonstrate that BGD-based Adam feed-forward equalizer works well in 120-Gbit/s PAM8 optical interconnects. In conclusion, BGD-based Adam algorithm shows great potential for converging the tap coefficients of TDE in future optical interconnects., Comment: Under review of Optics Letters

Published
2019
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216. Field-free switching of a Spin-orbit torque device aided by interlayer-coupling induced domain walls

Author

Zhao, Xiaotian, Liu, Wei, Li, Shangkun, Liu, Long, Song, Yuhang, Li, Yang, Ma, Jun, Sun, Xingdan, Wang, Hanwen, Zhao, Xinguo, and Zhang, Zhidong

Subjects
Physics - Applied Physics
Abstract

The spin-orbit torque device is promising as a candidate for next generation magnetic memory, while the static in-plane field needed to induce deterministic switching is a main obstacle for its application in highly integrated circuits. Instead of introducing effective field into the device, in this work we present an alternative way to achieve the field-free current-driven magnetization switching. By adding Tb/Co multilayers at two ends of the current channel, assisting domain wall is created by interlayer exchange coupling. The field-free deterministic switching is achieved by the movement of the domain wall driven by current. By loop shift measurement we find the driven force exerted on the domain wall is determined by the direction of the in-plane moment in the domain wall. Finally, we modify the device into a synthetic antiferromagnetic structure to solve the problem of reading out signal. The present work broadens the choice of field-free spin-orbit torque device design and clearly depicts the difference between two different switching mechanism.

Published
2019

249. Robust Adaptive Cubature Kalman Filter for Attitude Determination in Wearable Inertial Sensor Networks

Author

Zhao, Hongkai, Wang, Huihui, Wang, Zhelong, Liu, Long, Qiu, Sen, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wang, Lei, editor, Segal, Michael, editor, Chen, Jenhui, editor, and Qiu, Tie, editor

Published
2022
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250. Deep Siamese Network with Contextual Transformer for Remote Sensing Images Change Detection

Author

Zhang, Mengxuan, Liu, Zhao, Feng, Jie, Jiao, Licheng, Liu, Long, Rannenberg, Kai, Editor-in-Chief, Soares Barbosa, Luís, Editorial Board Member, Goedicke, Michael, Editorial Board Member, Tatnall, Arthur, Editorial Board Member, Neuhold, Erich J., Editorial Board Member, Stiller, Burkhard, Editorial Board Member, Tröltzsch, Fredi, Editorial Board Member, Pries-Heje, Jan, Editorial Board Member, Kreps, David, Editorial Board Member, Reis, Ricardo, Editorial Board Member, Furnell, Steven, Editorial Board Member, Mercier-Laurent, Eunika, Editorial Board Member, Winckler, Marco, Editorial Board Member, Malaka, Rainer, Editorial Board Member, Shi, Zhongzhi, editor, Jin, Yaochu, editor, and Zhang, Xiangrong, editor

Published
2022
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