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O: Fachverband Oberflächenphysik

O 75: Metal Substrates: Growth Studies

O 75.4: Vortrag

Mittwoch, 18. März 2020, 15:45–16:00, WIL C107

Investigation of the lithium fluoride growth on the silver (100) surface — •Vladyslav Romankov and Jan Dreiser — Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland

Lithium fluoride (LiF) has been shown to be an interesting material for spintronic applications [1], and it is a potential candidate for decoupling single-molecule magnets (SMMs) from metallic substrates, which helps to enhance their magnetic stability [2]. To understand the growth of LiF on Ag, we have investigated samples of up to a few nominal monolayers deposited in ultra-high vacuum from an effusion cell onto the Ag(100) surface held at room temperature. Our study combines scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and polarized X-ray absorption spectroscopy (XAS).

The XAS results show that the fluorine local environment of the samples is virtually identical to the one in bulk LiF, while the appearance of the linear dichroism is consistent with a small tetragonal distortion, arising from the LiF-substrate interaction. STM and LEED reveal that LiF forms islands with a dendritic shape, whose branches extend along the <010> directions of the Ag(100) plane. We also observe an inhomogeneous vertical growth of the dendrites with increasing amount of deposited material. By deposition onto the hot Ag(100) substrate, we expect to obtain flat, two-dimensional islands, which are suitable for decoupling of SMMs.

References: [1] - A. J. Drew et al., Nature Materials, 8, 109, (2009); [2] - C. Wäckerlin et al., Advanced Materials, 28, 5142, (2016).