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Journal Article

Magneto-optical properties of Au upon the injection of hot spin-polarized electrons across Fe/Au(0 0 1) interfaces

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Razdolski,  Ilya
Institute of Molecules and Materials of Le Mans, CNRS UMR 6283;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Melnikov,  Alexey
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Institute of Physics, Martin Luther University Halle-Wittenberg;

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1810.12237.pdf
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Citation

Alekhin, A., Razdolski, I., Berritta, M., Bürstel, D., Temnov, V., Diesing, D., et al. (2019). Magneto-optical properties of Au upon the injection of hot spin-polarized electrons across Fe/Au(0 0 1) interfaces. Journal of Physics: Condensed Matter, 31(12): 124002. doi:10.1088/1361-648X/aafd06.


Cite as: https://hdl.handle.net/21.11116/0000-0003-06F3-4
Abstract
We demonstrate a novel method for the excitation of sizable magneto-optical effects in Au by means of the laser-induced injection of hot spin-polarized electrons in Au/Fe/MgO(0 0 1) heterostructures. It is based on the energy- and spin-dependent electron transmittance of Fe/Au interface which acts as a spin filter for non-thermalized electrons optically excited in Fe. We show that after crossing the interface, majority electrons propagate through the Au layer with the velocity on the order of 1 nm fs−1 (close to the Fermi velocity) and the decay length on the order of 100 nm. Featuring ultrafast functionality and requiring no strong external magnetic fields, spin injection results in a distinct magneto-optical response of Au. We develop a formalism based on the phase of the transient complex MOKE response and demonstrate its robustness in a plethora of experimental and theoretical MOKE studies on Au, including our ab initio calculations. Our work introduces a flexible tool to manipulate magneto-optical properties of metals on the femtosecond timescale that holds high potential for active magneto-photonics, plasmonics, and spintronics.