中国物理B ›› 2020, Vol. 29 ›› Issue (7): 77804-077804.doi: 10.1088/1674-1056/ab8dae

所属专题: SPECIAL TOPIC —Terahertz physics

• SPECIAL TOPIC—Ultracold atom and its application in precision measurement • 上一篇    下一篇

Temperature dependent terahertz giant anisotropy and cycloidal spin wave modes in BiFeO3 single crystal

Fan Liu(刘凡), Zuanming Jin(金钻明), Xiumei Liu(刘秀梅), Yuqing Fang(方雨青), Jiajia Guo(国家嘉), Yan Peng(彭滟), Zhenxiang Cheng(程振祥), Guohong Ma(马国宏), Yiming Zhu(朱亦鸣)   

  1. 1 Shanghai Key Laboratory of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Department of Physics, Shanghai University, Shanghai 200444, China;
    3 Institute for Superconducting and Electronic Materials, University of Wollongong, NSW, Australia;
    4 SIOM & STU Joint Laboratory for Superintense Lasers and the Applications, Shanghai 201210, China;
    5 Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China
  • 收稿日期:2020-03-29 修回日期:2020-04-21 出版日期:2020-07-05 发布日期:2020-07-05
  • 通讯作者: Zuanming Jin, Guohong Ma, Yiming Zhu E-mail:physics_jzm@usst.edu.cn;ghma@staff.shu.edu.cn;ymzhu@usst.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61975110, 11674213, 61735010, and 11604202), the 111 Project, China (Grant No. D18014), the International Joint Lab Program supported by Science and Technology Commission Shanghai Municipality, China (Grant No. 17590750300), the Key Project supported by Science and Technology Commission Shanghai Municipality, China (Grant No. YDZX20193100004960), Science and Technology Commission of Shanghai Municipality, China (Shanghai Rising-Star Program 18QA1401700), and Shanghai Educational Development Foundation, China (Chen Guang Project 16CG45).

Temperature dependent terahertz giant anisotropy and cycloidal spin wave modes in BiFeO3 single crystal

Fan Liu(刘凡)1, Zuanming Jin(金钻明)1,2,5, Xiumei Liu(刘秀梅)2, Yuqing Fang(方雨青)1, Jiajia Guo(国家嘉)2, Yan Peng(彭滟)1,5, Zhenxiang Cheng(程振祥)3, Guohong Ma(马国宏)2,4, Yiming Zhu(朱亦鸣)1,5   

  1. 1 Shanghai Key Laboratory of Modern Optical System, and Engineering Research Center of Optical Instrument and System(Ministry of Education), University of Shanghai for Science and Technology, Shanghai 200093, China;
    2 Department of Physics, Shanghai University, Shanghai 200444, China;
    3 Institute for Superconducting and Electronic Materials, University of Wollongong, NSW, Australia;
    4 SIOM & STU Joint Laboratory for Superintense Lasers and the Applications, Shanghai 201210, China;
    5 Shanghai Institute of Intelligent Science and Technology, Tongji University, Shanghai 200092, China
  • Received:2020-03-29 Revised:2020-04-21 Online:2020-07-05 Published:2020-07-05
  • Contact: Zuanming Jin, Guohong Ma, Yiming Zhu E-mail:physics_jzm@usst.edu.cn;ghma@staff.shu.edu.cn;ymzhu@usst.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61975110, 11674213, 61735010, and 11604202), the 111 Project, China (Grant No. D18014), the International Joint Lab Program supported by Science and Technology Commission Shanghai Municipality, China (Grant No. 17590750300), the Key Project supported by Science and Technology Commission Shanghai Municipality, China (Grant No. YDZX20193100004960), Science and Technology Commission of Shanghai Municipality, China (Shanghai Rising-Star Program 18QA1401700), and Shanghai Educational Development Foundation, China (Chen Guang Project 16CG45).

摘要: THz time-domain spectroscopy (THz-TDS) is used to study the THz-optical properties of a single crystal bismuth ferrite BiFeO3 (BFO). It can be found that the anisotropy of BiFeO3 is strongly dependent on the temperature. A giant birefringence up to around 3.6 is observed at 1 THz. The presence of a spatially modulated cycloidal antiferromagnetic structure leads to spin cycloid resonances (SCR) ψ and Φ, corresponding to the out-of-plane and in-plane modes of the spin cycloid, respectively. We distinguish the SCR with respect to their response to orthogonal polarizations of the electric fields of the incident THz beam. In addition, we observe a resonance appearing below 140 K, which might be interpreted as an electromagnon mode and related to a spin reorientation transition. Our present observations present that the temperature and polarization, as the external control parameters, can be used to modulate the THz optical properties of BFO single crystal.

关键词: time resolved terahertz spectroscopy, dielectric anisotropy, spin cycloid resonance

Abstract: THz time-domain spectroscopy (THz-TDS) is used to study the THz-optical properties of a single crystal bismuth ferrite BiFeO3 (BFO). It can be found that the anisotropy of BiFeO3 is strongly dependent on the temperature. A giant birefringence up to around 3.6 is observed at 1 THz. The presence of a spatially modulated cycloidal antiferromagnetic structure leads to spin cycloid resonances (SCR) ψ and Φ, corresponding to the out-of-plane and in-plane modes of the spin cycloid, respectively. We distinguish the SCR with respect to their response to orthogonal polarizations of the electric fields of the incident THz beam. In addition, we observe a resonance appearing below 140 K, which might be interpreted as an electromagnon mode and related to a spin reorientation transition. Our present observations present that the temperature and polarization, as the external control parameters, can be used to modulate the THz optical properties of BFO single crystal.

Key words: time resolved terahertz spectroscopy, dielectric anisotropy, spin cycloid resonance

中图分类号:  (Ultrafast spectroscopy (<1 psec))

  • 78.47.J-
78.20.-e (Optical properties of bulk materials and thin films) 76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance) 75.30.Ds (Spin waves)