Role of hydrogen in giant spin polarization observed on magnetic nanostructures

We demonstrate that the giant spin contrast observed by scanning tunneling microscopy for double-layer Coislands on Pt(111) is caused by adsorbates at the apex of the Cr-coated W tip. The most likely candidate, in ab initio simulations, is hydrogen. Here, the electron charge is highly polarized by the adjacent Cr layers. The hydrogen adsorption site is shown to change from hollow to on top due to the electric field at the tip apex, created by the tunnel voltage.


Published in:
Physical Review Letters, 100, 2
Year:
2008
ISSN:
0031-9007
ISBN:
0031-9007
Keywords:
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 Record created 2009-04-14, last modified 2018-03-17

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