Ultrafast spin current generated from an antiferromagnet

被引:108
|
作者
Qiu, Hongsong [1 ]
Zhou, Lifan [2 ,3 ]
Zhang, Caihong [1 ]
Wu, Jingbo [1 ]
Tian, Yuanzhe [2 ,3 ]
Cheng, Shaodong [4 ]
Mi, Shaobo [4 ]
Zhao, Haibin [5 ,6 ]
Zhang, Qi [3 ]
Wu, Di [2 ,3 ]
Jin, Biaobing [1 ]
Chen, Jian [1 ]
Wu, Peiheng [1 ]
机构
[1] Nanjing Univ, Sch Elect Sci & Engn, Res Inst Superconductor Elect RISE, Nanjing, Peoples R China
[2] Nanjing Univ, Jiangsu Prov Key Lab Nanotechnol, Natl Lab Solid State Microstruct, Collaborat Innovat Ctr Adv Microstruct, Nanjing, Peoples R China
[3] Nanjing Univ, Dept Phys, Nanjing, Peoples R China
[4] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian, Peoples R China
[5] Fudan Univ, Shanghai Ultraprecis Opt Mfg Engn Res Ctr, Shanghai, Peoples R China
[6] Fudan Univ, Key Lab Micro & Nano Photon Struct, Minist Educ, Dept Opt Sci & Engn, Shanghai, Peoples R China
基金
中国国家自然科学基金;
关键词
MAGNETIZATION; CONVERSION; EFFICIENT; SURFACES;
D O I
10.1038/s41567-020-01061-7
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Antiferromagnets (AFMs) have the potential to push spintronic devices from a static condition or gigahertz frequency range to the terahertz range for the sake of high-speed processing. However, the insensitivity of AFMs to magnetic fields makes the manipulation of spin currents difficult. The ultrafast generation of the spin current in ferromagnet/heavy-metal (HM) structures has received a lot of attention in recent years, but whether a similar scenario can be observed in an AFM/HM system is still unknown. Here, we show the optical generation of ultrafast spin current in an AFM/HM heterostructure at zero external magnetic field and at room temperature by detecting the associated terahertz emission. We believe that this is a common phenomenon in antiferromagnets with strong nonlinear optical effects. Our results open an avenue of fundamental research into antiferromagnetism and a route to AFM spintronic devices.
引用
收藏
页码:388 / +
页数:8
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