Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field

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Abstract

We report on the nonlinear magnetization dynamics of a HoFeO3 crystal induced by a strong terahertz magnetic field resonantly enhanced with a split ring resonator and measured with magneto-optical Kerr effect microscopy. The terahertz magnetic field induces a large change (∼40%) in the spontaneous magnetization. The frequency of the antiferromagnetic resonance decreases in proportion to the square of the magnetization change. A modified Landau-Lifshitz-Gilbert equation with a phenomenological nonlinear damping term quantitatively reproduced the nonlinear dynamics.

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Mukai, Y., Hirori, H., Yamamoto, T., Kageyama, H., & Tanaka, K. (2016). Nonlinear magnetization dynamics of antiferromagnetic spin resonance induced by intense terahertz magnetic field. New Journal of Physics, 18(1). https://doi.org/10.1088/1367-2630/18/1/013045

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