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. 2019 Oct 11;123(15):157202.
doi: 10.1103/PhysRevLett.123.157202.

Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO_{3}

E A Mashkovich  1 , K A Grishunin  1   2 , R V Mikhaylovskiy  1   3 , A K Zvezdin  4   5 , R V Pisarev  6 , M B Strugatsky  7 , P C M Christianen  1   8 , Th Rasing  1 , A V Kimel  1
Affiliations

Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO_{3}

E A Mashkovich et al. Phys Rev Lett. .

Abstract

A nearly single cycle intense terahertz (THz) pulse with peak electric and magnetic fields of 0.5 MV/cm and 0.16 T, respectively, excites both modes of spin resonances in the weak antiferromagnet FeBO_{3}. The high frequency quasiantiferromagnetic mode is excited resonantly and its amplitude scales linearly with the strength of the THz magnetic field, whereas the low frequency quasiferromagnetic mode is excited via a nonlinear mechanism that scales quadratically with the strength of the THz electric field and can be regarded as a THz inverse Cotton-Mouton effect. THz optomagnetism is shown to be more energy efficient than similar effects reported previously for the near-infrared spectral range.

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