Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8

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• 作者：Yuto Kinoshita ; Noriaki Kida ; Masato Sotome ; Tatsuya Miyamoto ; Yusuke Iguchi ; Yoshinori Onose ; Hiroshi Okamoto
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：3
• 期：7
• 页码：1170-1175
• 全文大小：529K
• 年卷期：0
• ISSN：2330-4022

文摘

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.