SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.52: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Magneto-optical probing of orbital accumulation in a light metal — •Sanaz Alikhah1, Marco Berritta2, Peter M. Oppeneer1, Igor Lyalin3, and Roland K. Kawakami3 — 1Uppsala University, Uppsala, Sweden — 2University of Exeter, Exeter, United Kingdom — 3Ohio State University, Ohio, USA
Orbital currents and orbital accumulation are attractive alternatives to the commonly employed spin counterparts, generated typically by the spin Hall effect in heavy metals. However, the detection of orbital currents and accumulation is a challenging task. Here we investigate theoretically the possibility of magneto-optical (MO) detection of current-induced orbital accumulation in the light metal chromium. Using linear-response theory, we compute, first, the spin and orbital accumulation and then predict the expected MO spectrum for pure spin accumulation or pure orbital accumulation. We find that the orbital Hall effect is much larger than the spin Hall effect, and that the orbital MO response is much larger than that due to the spin polarization. This result opens the door for MO detection of current-induced orbital accumulation. Finally, we compare the computed MO responses with recent MO Kerr effect measurements on chromium.