SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 1: Surface Magnetism (joint session MA/O)

MA 1.4: Talk

Monday, September 27, 2021, 11:00–11:15, H5

Iron growth on Be(0001) studied by STM — •Hermann Osterhage, Karoline Oetker, Roland Wiesendanger, and Stefan Krause — Department of Physics, University of Hamburg, Germany

Under high pressure, bulk Fe undergoes a phase transition to the є-phase in a hexagonal close-packed (hcp) structure [1]. To date, the need for anvil cells to create є-Fe prohibits an experimental validation of the noncollinear or antiferromagentic ground states predicted theoretically [2]. In our approach, Be(0001) is used as a closely-spaced hcp substrate that may accommodate є-Fe provided that pseudomorphic growth occurs.

The clean Be(0001) surface was characterized using scanning tunneling spectroscopy at low temperatures. It hosts a parabolically dispersing surface state that couples strongly to phonon modes as evidenced in inelastic tunneling spectroscopy [3].

Fe growth on this surface was studied in dependence of coverage and substrate temperature during deposition. The Fe grows in multilayer islands when deposited at room temperature. For elevated temperatures, a combination of high resolution scanning tunneling microscopy and Auger electron spectroscopy shows hints of the formation of a locally ordered alloy of Fe and Be. The morphology of the resulting films and scanning tunneling spectra acquired on this system will be presented and discussed.

[1] I. Leonov et al., Phys. Rev. Lett. 106, 106405 (2011).

[2] R. Lizárraga et al., Phys. Rev. B 78, 064410 (2008).

[3] H. Osterhage et al., Phys. Rev. B 103, 155428 (2021).