Magneto-opto-phononic inverse Faraday effect

Lopez, Daniel A. Bustamante [Boston University, MA (United States)] (ORCID:0000000300126335); Hu, Wanzheng [Boston University, MA (United States)] (ORCID:0000000209260760); Juraschek, Dominik M. [Tel Aviv University (Israel); Eindhoven University of Technology (Netherlands)] (ORCID:0000000272108411)

doi:10.1103/xmxz-zt1m

DOE OSTI · 2998482

Magneto-opto-phononic inverse Faraday effect

Lopez, Daniel A. Bustamante [Boston University, MA (United States)] (ORCID:0000000300126335)·Hu, Wanzheng [Boston University, MA (United States)] (ORCID:0000000209260760)·Juraschek, Dominik M. [Tel Aviv University (Israel); Eindhoven University of Technology (Netherlands)] (ORCID:0000000272108411)

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Abstract

Nonlinear frequency conversion processes, such as optical rectification, difference-frequency generation, and sum-frequency generation, are fundamental for producing electromagnetic radiation at diverse frequencies. In this work, we demonstrate that coherently excited infrared-active phonons can act as transducers for generating nonlinear magnetizations through phonon-magnon interactions, analogous to nonlinear optical frequency conversion. We derive analytical solutions for the time-dependent magnetizations arising from the second-order response to the electric field component of an ultrashort laser pulse. These solutions enable us to define second-order nonlinear magneto-electric susceptibilities, which describe rectification, impulsive excitation, and sum-frequency excitation of coherent magnons. Our theoretical framework naturally incorporates the conventional magneto-optic and phonon inverse Faraday effects and predicts a hybrid magneto-opto-phononic inverse Faraday effect involving photon-phonon-magnon scattering. This work highlights nonlinear phononics as a pathway for controlling magnetization in solids.

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Landau-Lifschitz-Gilbert equation Magneto-optics Magnons Nonlinear optics Phonons

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Lopez, Daniel A. Bustamante [Boston University, MA (United States)] (ORCID:0000000300126335), Hu, Wanzheng [Boston University, MA (United States)] (ORCID:0000000209260760), Juraschek, Dominik M. [Tel Aviv University (Israel); Eindhoven University of Technology (Netherlands)] (ORCID:0000000272108411). 2025-10-15. Magneto-opto-phononic inverse Faraday effect. https://doi.org/10.1103/xmxz-zt1m

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