Terahertz radiation from coherent antiferromagnetic magnons excited by femtosecond laser pulses

被引：92

作者：

Nishitani, Junichi ^{[1
]}

Kozuki, Kohei ^{[1
]}

Nagashima, Takeshi ^{[1
]}

Hangyo, Masanori ^{[1
]}

机构：

[1] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 22期

关键词：

antiferromagnetic materials; laser beam effects; magnetic moments; magnons; nickel compounds; stimulated Raman scattering; terahertz wave spectra; EMISSION; SURFACES; PHONONS; NICKEL; NIO;

D O I：

10.1063/1.3436635

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the observation of terahertz (THz) radiation emitted from antiferromagnetic (AFM) single-crystal nickel oxide irradiated with femtosecond laser pulses. Periodic oscillations observed in the THz waveforms are assigned to the radiation from coherent AFM magnons excited by the laser pulses. Impulsive stimulated Raman scattering process is a possible mechanism of the coherent AFM magnon excitation by the laser pulses. The excited magnons in NiO generate THz waves by magnetic dipole radiation, which is the inverse process of AFM resonance absorption of THz waves. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3436635]

引用

页数：3

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