Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 112: Electronic structure: Surface magnetism and spin phenomena II

O 112.9: Vortrag

Freitag, 16. März 2018, 12:30–12:45, MA 042

Magnetism of thin Cr and Mn films on W(100) — •Matthias Vogt¹, Martin Schmitt¹, Ryan Cotsakis², and Matthias Bode¹ — ¹Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — ²The University of British Columbia, 2329 West Mall, Vancouver, BC, Canada V6T 1Z4

In this contribution we present spin-polarized scanning tunneling microscopy (SP-STM) data of thin Cr and Mn films on W(001). Due to strong spin-orbit coupling in the W substrate a significant Dzyaloshinskii-Morija interaction (DMI) can be expected, potentially leading to spin structures which are very different from those found in corresponding bulk materials. Quite contrary to this expectation, our results obtained on monolayer and double-layer Cr films on W(001) show an antiferromagnetic order between adjacent terraces, comparable to earlier observations on (001) surfaces of bulk Cr [1,2]. For the Mn double-layer on W(001) our SP-STM data show a checkerboard-like (√2 × √2) spin structure with an in-plane easy axis, largely reminiscent of the magnetic state previously found on the Fe monolayer on W(001), but very different from the spin spiral observed for the Mn monolayer on W(001) [3,4].

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P. Ferriani et al., Phys. Rev. Lett. 101, 027201 (2008).