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Photo-Induced Magneto-Optical Kerr Effect in Europium Sulfide EuS

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Abstract

The influence of light exposure on the magneto-optical Kerr effect in the ferromagnetic semiconductor europium sulfide EuS has been studied. It has been experimentally established that when a sample is exposed to the light with a photon energy greater than the band gap, photoinduced magnetization occurs, which is associated with the formation of magnetic polarons with a large magnetic moment of about 3000 μB. The polarons are excited in a narrow temperature range of 12–18 K and form a superparamagnetic ensemble with an average polaron lifetime of 13 μs. A method for observing photo-induced magnetization using optical pump-probe technique has been described.

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ACKNOWLEDGMENTS

The authors thank R.V. Pisarev for useful discussions and V.V. Kaminskii for providing a sample of EuS.

Funding

The authors thank for the financial support of the RFBR projects (19-52-12063 and 19-52-12066) and the RAS Presidium program no. 5.

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Authors and Affiliations

  1. Ioffe Institute, St. Petersburg, Russia

    P. A. Usachev, V. N. Katz & V. V. Pavlov

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  1. P. A. Usachev
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  2. V. N. Katz
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  3. V. V. Pavlov
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Correspondence to P. A. Usachev.

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Translated by N. Petrov

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Usachev, P.A., Katz, V.N. & Pavlov, V.V. Photo-Induced Magneto-Optical Kerr Effect in Europium Sulfide EuS. Phys. Solid State 62, 1619–1623 (2020). https://doi.org/10.1134/S1063783420090309

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  • DOI: https://doi.org/10.1134/S1063783420090309

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