Ultrafast optical modification of exchange interactions in iron oxides

Mikhaylovskiy, R. V.; Hendry, E.; Secchi, A.; Mentink, Johan H.; Eckstein, Martin; Wu, A.; Pisarev, R. V.; Kruglyak, V. V.; Katsnelson, M. I.; Rasing, T.; Kimel, A. V.

doi:10.1038/ncomms9190

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Ultrafast optical modification of exchange interactions in iron oxides

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Mentink, Johan H.
Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany;
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Eckstein, Martin
Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany;
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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http://dx.doi.org/10.1038/ncomms9190
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http://arxiv.org/abs/1412.7094
(Preprint)

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ncomms9190-s1.pdf
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Citation

Mikhaylovskiy, R. V., Hendry, E., Secchi, A., Mentink, J. H., Eckstein, M., Wu, A., et al. (2015). Ultrafast optical modification of exchange interactions in iron oxides. Nature Communications, 6: 8190. doi:10.1038/ncomms9190.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-9021-8

Abstract

Ultrafast non-thermal manipulation of magnetization by light relies on either indirect coupling of the electric field component of the light with spins via spin-orbit interaction or direct coupling between the magnetic field component and spins. Here we propose a scenario for coupling between the electric field of light and spins via optical modification of the exchange interaction, one of the strongest quantum effects with strength of 10³ Tesla. We demonstrate that this isotropic opto-magnetic effect, which can be called inverse magneto-refraction, is allowed in a material of any symmetry. Its existence is corroborated by the experimental observation of terahertz emission by spin resonances optically excited in a broad class of iron oxides with a canted spin configuration. From its strength we estimate that a sub-picosecond modification of the exchange interaction by laser pulses with fluence of about 1 mJ cm⁻² acts as a pulsed effective magnetic field of 0.01 Tesla.