Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I

MA 20.25: Poster

Dienstag, 19. März 2024, 16:30–19:00, Poster A

Epitaxy of Fe/Rh bilayers with efficient spin pumping — •Jonas Wiemeler¹, Ali Can Aktas¹, Ivan Tarasov¹, András Kovács², Rafal Dunin-Borkowski², Michael Farle¹, and Anna Semisalova¹ — ¹Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany — ²Ernst Ruska-Centre, Forschungszentrum Jülich, 52428 Jülich, Germany

We investigate the growth and epitaxy of Rh on Fe(001)/GaAs(001)-4x6 ultra thin bilayer deposited using molecular beam epitaxy in ultrahigh vacuum (5E-10 mbar). We use in situ low-energy electron diffraction and Auger electron spectroscopy during growth, as well as cross-sectional transmission electron microscopy, X-ray diffraction and x-ray circular magnetic dichroism, and show that the Fe/Rh interface is atomically sharp and Rh is not magnetically polarised. The fcc-Rh layers grow 45^∘ rotated to the bcc-Fe lattice, that is Rh(001)[110]||Fe(001)[100] to minimise the lattice mismatch to ≈6%. Cross-section TEM reveals high crystallinity with minimal misfit dislocation defects of 0.2 defects/nm at the interface with Fe. Rh grows in a layer-like Stranski-Krastanov mode on the Fe substrate [1]. Using conventional broadband ferromagnetic resonance, we find that the Fe/Rh bilayer system shows a high spin pumping efficiency with the spin-mixing conductance g_mix^↑↓ = ( 2.5 ± 0.2 ) · 10¹⁹ m⁻² comparable to that of Fe/Rh bilayers [2,3]. Financially supported by DFG Projects: CRC/TRR 270 No. 10405553726 and No. 39240249 (SE 2853/1-1) [1] T. Kachel et al., PRB 46, 12888 (1992), [2] A. Conca et al., PRB 93, 134405 (2016), [3] T. Papaioannou et al., APL 103, 162401 (2013)

Keywords: FMR; Fe/Rh; Spin pumping; Epitaxy; Bilayer