研究领域
我们课题组长期关注自旋电子学方面的研究，在强关联量子材料、自旋动力学、自旋拓扑物理和量子器件等方面取得了一系列成果。课题组目前的重心集中在基于磁性斯格明子(skyrmion)的拓扑自旋轨道电子学。自从在非中心对称的手性块体磁性材料中被发现以后，斯格明子在凝聚态物理学以及自旋电子学领域引起了非常大的关注。这来源于：1）由于受拓扑保护，斯格明子非常容易被电流的驱动从而被认为是低功耗自旋器件的最佳选择。2）实空间自旋拓扑态的给予了丰富的拓扑输运现象，包括拓扑电荷的霍尔效应，新兴磁电动力学，等效磁单极子等等。
在低维人工磁性异质结中，通过引入界面的反演对称性破缺以及相应的手性磁相互作用，我们研究团队做出了开创性的贡献。包括实现室温下的斯格明子以及它的自旋电流操控，观测到拓扑电荷的霍尔效应。这个领域里还有很多有趣的, 并且具有巨大潜在科技应用价值的拓扑物理现象等待被索。
我们的主要研究手段包括:
1: 时间以及空间分辨的磁光克尔成像技术
2: 低维人工磁性异质结制备技术 (磁控溅射,分子束外延)
3: 自旋相关成像技术 (包括磁力显微镜,洛伦兹透射电子显微镜,自旋极化低 能电子显微镜,以及基于同步辐射的自旋成像技术)
4: 静态,动态自旋输运 (自旋霍尔效应,自旋转矩铁磁共振)
近期论文
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Compensated magnetic insulators for extremely fast spin-orbitronics Heng-An Zhou, Yiqing Dong, Teng Xu, Kun Xu, Luis Sánchez-Tejerina, Le Zhao, You Ba, Pierluigi Gargiani, Manuel Valvidares, Yonggang Zhao, Mario Carpentieri, Oleg A Tretiakov, Xiaoyan Zhong, Giovanni Finocchio, Se Kwon Kim, Wanjun Jiang* Preprint at: arXiv preprint arXiv:1912.01775.
Non-Volatile Magnetic Memory Combined with AND/NAND Boolean Logic Gates Based on Geometry-Controlled Magnetization Switching Ziyao Lu, Chengyue Xiong, Hongming Mou, Zhaochu Luo, Wanjun Jiang, Xixiang Zhang, XZ Zhang IEEE Magnetics Letters, in press (2021).
Néel‐Type Elliptical Skyrmions in a Laterally Asymmetric Magnetic Multilayer Baoshan Cui, Dongxing Yu, Ziji Shao, Yizhou Liu, Hao Wu, Pengfei Nan, Zengtai Zhu, Chuangwen Wu, Tengyu Guo, Peng Chen, Heng‐An Zhou, Li Xi, Wanjun Jiang, Hao Wang, Shiheng Liang, Haifeng Du, Kang L Wang, Wenhong Wang, Kehui Wu, Xiufeng Han, Guangyu Zhang, Hongxin Yang, Guoqiang Yu Advanced Materials, 2006924 (2021).
Electrically Reconfigurable 3D Spin‐Orbitronics Yiqing Dong, Teng Xu, Heng‐An Zhou, Li Cai, Huaqiang Wu, Jianshi Tang, Wanjun Jiang* Advanced Functional Materials 31 (9), 2007485 (2021).
Evolution of domain structure in Fe3GeTe2 Siqi Yin, Le Zhao, Cheng Song, Yuan Huang, Youdi Gu, Ruyi Chen, Wenxuan Zhu, Yiming Sun, Wanjun Jiang, Xiaozhong Zhang, Feng Pan Chinese Physics B 30 (2), 027505 (2021).
Electric-field control of skyrmions in multiferroic heterostructure via magnetoelectric coupling You Ba, Shihao Zhuang, Yike Zhang, Yutong Wang, Yang Gao, Hengan Zhou, Mingfeng Chen, Weideng Sun, Quan Liu, Guozhi Chai, Jing Ma, Ying Zhang, Huanfang Tian, Haifeng Du, Wanjun Jiang, Cewen Nan, Jia-Mian Hu, Yonggang Zhao Nature communications 12 (1), 1-10 (2021).
Absence of spin Hall magnetoresistance in Pt/(CoNi)n multilayers Yongwei Cui, Xiaoyu Feng, Qihan Zhang, Hengan Zhou, Wanjun Jiang, Jiangwei Cao, Desheng Xue, Xiaolong Fan Physical Review B 103 (2), 024415 (2021).
Rapid Kerr imaging characterization of the magnetic properties of two-dimensional ferromagnetic Fe3GeTe2 Li Cai, Chenglin Yu, Liangyang Liu, Wei Xia, Heng-An Zhou, Le Zhao, Yiqing Dong, Teng Xu, Zidong Wang, Yanfeng Guo, Yonggang Zhao, Jinsong Zhang, Luyi Yang, Lexian Yang, Wanjun Jiang* Applied Physics Letters 117 (19), 192401 (2020).
Thermal generation, manipulation and thermoelectric detection of skyrmions Zidong Wang, Minghua Guo, Heng-An Zhou, Le Zhao, Teng Xu, Riccardo Tomasello, Hao Bai, Yiqing Dong, Soong-Geun Je, Weilun Chao, Hee-Sung Han, Sooseok Lee, Ki-Suk Lee, Yunyan Yao, Wei Han, Cheng Song, Huaqiang Wu, Mario Carpentieri, Giovanni Finocchio, Mi-Young Im, Shi-Zeng Lin, Wanjun Jiang* Nature Electronics 3 (11), 672-679 (2020).
Spin-Topology Dependent Brownian Diffusion of Skyrmions Le Zhao, Zidong Wang, Xichao Zhang, Jing Xia, Keyu Wu, Heng-An Zhou, Yiqing Dong, Guoqiang Yu, Kang L Wang, Xiaoxi Liu, Yan Zhou, Wanjun Jiang* Physical Review Letters 125, 027206 (2020).
High Spin Hall Conductivity in Large‐Area Type‐II Dirac Semimetal PtTe2 Hongjun Xu, Jinwu Wei, Hengan Zhou, Jiafeng Feng, Teng Xu, Haifeng Du, Congli He, Yuan Huang, Junwei Zhang, Yizhou Liu, Han‐Chun Wu, Chenyang Guo, Xiao Wang, Yao Guang, Hongxiang Wei, Yong Peng, Wanjun Jiang, Guoqiang Yu, Xiufeng Han Advanced Materials 32 (17), 2000513 (2020).
Imaging magnetization switching induced by spin-orbit torque in perpendicularly magnetized Ta/CoFeB structure Xiaoyang Liu, Liyang Liao, Fenghua Xue, Lu Sun, Yihong Fan, Wanjun Jiang, Shilei Zhang, Cheng Song, Xufeng Kou IEEE Transactions on Magnetics 56 (5), 1-6 (2020).
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