Ultrafast time domain demonstration of bulk magnetization precession at zero magnetic field ferromagnetic resonance induced by terahertz magnetic field
Ultrafast time domain demonstration of bulk magnetization precession at zero magnetic field ferromagnetic resonance induced by terahertz magnetic field
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DOI：
10.1364/oe.18.018260
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发表时间：
2010-08-16
期刊：
影响因子：
3.8
通讯作者：
Suemoto, T.
中科院分区：
文献类型：
--
作者：
Nakajima, M.;Namai, A.;Suemoto, T.
我们首次使用太赫兹时域谱观测到了亚太赫兹体磁化进动。掺镓e-铁氧化物纳米铁磁体在零磁场下的磁化进动是由太赫兹波的脉冲磁场通过旋磁效应引起的。仅在谐振频率下，实现了线偏振波到圆偏振波的转换。这被理解为从对应于自然共振的旋转磁偶极子辐射的自由感应衰减信号。此外，这一系列的镓取代e-铁氧化物纳米铁磁材料在下一代无线通信中非常有前景，可以在室温下工作而不需要外加磁场的磁光器件。(C)2010年美国光学学会
We report the first observation of sub-terahertz bulk-magnetization precession, using terahertz time-domain spectroscopy. The magnetization precession in gallium-substituted e-iron oxide nano-ferromagnets under zero magnetic field is induced by the impulsive magnetic field of the THz wave through the gyromagnetic effect. Just at the resonance frequency, the linear to circular polarized wave conversion is realized. This is understood as the free induction decay signal radiated from a rotating magnetic dipole corresponding to the natural resonance. Furthermore, this demonstration reveals that the series of gallium-substituted e-iron oxide nano-ferromagnets is very prospective for magnetooptic devices, which work at room temperature without external magnetic field, in next-generation wireless communication. (C) 2010 Optical Society of America