Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8

Yuto Kinoshita, Noriaki Kida, Masato Sotome, Tatsuya Miyamoto, Yusuke Iguchi, Yoshinori Onose, Hiroshi Okamoto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


We report the terahertz radiation in the polar and ferrimagnetic insulating oxide LiFe5O8 upon irradiation of a femtosecond laser pulse at room temperature. By the resonant optical excitation of an originally spin-forbidden d-d transition in Fe3+ ions, we observed the emission of terahertz waves, which is attributable to the magnetic-dipole radiation originating from the light-induced subpicosecond magnetization modulation. By mapping out the emission of the terahertz waves, we successfully visualized the vector images of in-plane magnetic domains in magnetic fields. The terahertz-radiation imaging presented here is useful as a new tool to observe ferromagnetic or ferrimagnetic domains.

Original languageEnglish
Pages (from-to)1170-1175
Number of pages6
JournalACS Photonics
Issue number7
Publication statusPublished - 2016 Jul 20
Externally publishedYes


  • ferrimagnets
  • magnetic domains
  • magnetization modulation
  • terahertz radiation imaging

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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