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We demonstrate a novel method for the excitation of sizable magneto-opticaleffects in Au by means of the laser-induced injection of hot spin-polarizedelectrons in Au/Fe/MgO(001) heterostructures. It is based on the energy- andspin-dependent electron transmittance of Fe/Au interface which acts as a spinfilter for non-thermalized electrons optically excited in Fe. We show thatafter crossing the interface, majority electrons propagate through the Au layerwith the velocity on the order of 1 nm/fs (close to the Fermi velocity) and thedecay length on the order of 100 nm. Featuring ultrafast functionality andrequiring no strong external magnetic fields, spin injection results in adistinct magneto-optical response of Au. We develop a formalism based on thephase of the transient complex MOKE response and demonstrate its robustness ina plethora of experimental and theoretical MOKE studies on Au, including our abinitio calculations. Our work introduces a flexible tool to manipulatemagneto-optical properties of metals on the femtosecond timescale that holdshigh potential for active magneto-photonics, plasmonics, and spintronics.

Magneto-optical properties of Au upon the injection of hot spin-polarized electrons across Fe/Au(001) interfaces