Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8
Terahertz Radiation by Subpicosecond Magnetization Modulation in the Ferrimagnet LiFe5O8
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DOI：
10.1021/acsphotonics.6b00272
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发表时间：
2016-06
期刊：
影响因子：
7
通讯作者：
Y. Kinoshita;N. Kida;M. Sotome;T. Miyamoto;Y. Iguchi;Y. Onose;H. Okamoto
中科院分区：
文献类型：
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作者：
Y. Kinoshita;N. Kida;M. Sotome;T. Miyamoto;Y. Iguchi;Y. Onose;H. Okamoto
我们报道了在室温下，在飞秒激光脉冲照射下，极性和亚铁磁性绝缘氧化物LiFe5O8的太赫兹辐射。通过对Fe3+离子的自旋禁忌d-d跃迁的共振光激发，我们观察到了太赫兹波的发射，这归因于光感应亚皮秒磁化调制产生的磁偶极辐射。通过绘制太赫兹波的发射图，我们成功地可视化了磁场中平面磁畴的矢量图像。本文提出的太赫兹辐射成像是一种有用的新工具，可以用来观察铁磁或亚铁磁畴。
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.