Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions II (joint session MA/TT)
MA 47.2: Vortrag
Donnerstag, 15. März 2018, 15:30–15:45, H 1012
Spin-charge interconversion in single crystalline Bismuth films grown on Ge(111) — •minh tuan dau1, carlo Zucchetti2, federico bottegoni2, céline vergnaud1, thomas guillet1, alain marty1, cyrille beigné1, andrea picone2, alberto calloni2, giovanni isella2, franco ciccacci2, pranab kumar das3, jun fujii3, ivana vobornik3, marco finazzi2, and matthieu jamet1 — 1INAC-Spintec, CEA/CNRS/Grenoble-INP and Université Grenoble Alpes, 38054 Grenoble, France — 2LNESS-Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy — 3CNR-IOM Laboratorio TASC, 34149 Trieste, Italy
In this study, we have grown a bismuth wedge (0-12 nm) on Ge(111) by molecular beam epitaxy. Using structural characterization (RHEED and x-ray diffraction), we found a critical thickness of ~ 4.5 nm below which Bi exhibits an allotropic pseudocubic phase. A careful angle-resolved and spin-resolved photoemission spectroscopy study using synchrotron radiation showed that the pseudocubic phase exhibits surface states with linear band dispersion and a characteristic helical spin texture. We have then investigated the spin-charge interconversion at these surface states using different techniques: magneto-optical Kerr effect to probe the spin Hall effect (SHE), inverse SHE using optical spin orientation in the Ge film beneath and finally spin pumping from a ferromagnetic layer grown on top of Bi separated by an Al spacer. We found a significant signature of the spin-charge interconversion in these surface states and a clear Bi-thickness dependence of the conversion signals.