Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8

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, wh...

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Bibliographic Details
Published in:ACS photonics 2016-07, Vol.3 (7), p.1170-1175
Main Authors: Kinoshita, Yuto, Kida, Noriaki, Sotome, Masato, Miyamoto, Tatsuya, Iguchi, Yusuke, Onose, Yoshinori, Okamoto, Hiroshi
Format: Article
Language:English
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Summary: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.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.6b00272