Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Surface and Interface Magnetism II (jointly with MA)

O 65.5: Vortrag

Donnerstag, 14. März 2013, 11:30–11:45, H33

Spin-density wafe node on antiferromagnetic Cr(110) islands — •Tobias Mauerer¹, Pin-Jui Hsu¹, Weida Wu², and Matthias Bode¹ — ¹Institute of Experimental Physics II, University Würzburg, Am Hubland, 97074 Würzburg — ²Department of Physics and Astronomy and Rutgers Center for Emergent Materials, Rutgers University, Piscataway, New Jersy 08854, USA

We have performed a detailed analysis of the evolution of the charge-density wave (CDW) on the surface of nanoscale Cr islands grown on W(110). By combining conventional spin-averaged and spin-polarized scanning tunneling microscopy (SP-STM) we show that the CDW wavelength exhibits a striking thickness dependence. In particular, the CDW wavelength along the surface [110] direction increases by about 30% as the island thickness is decreased from about 50 nm to 5.2 nm. A gap with no CDW visible at the island surface appears for films within the thickness range of 3.7 ≤ Θ ≤ 5.2 nm. At even lower film thickness the CDW reappears until it vanishes at Θ ≤ 2.5 nm By applying SP-STM we show that the Cr surface is non-magnetic within the CDW gap. The CDW gap and the thickness dependence is explained in terms of a reorientation of the SDW vector Q, which rotates from bulk-like ⟨ 001⟩ directions into the [110] surface normal. We propose that the SDW pins with a node at the island surface, resulting in a vanishing surface magnetic moment.