SHG on ferromagnetic Gd films: indication of surface-state effects |
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Authors: | A Melnikov O Krupin U Bovensiepen K Starke M Wolf E Matthias |
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Institution: | Fachbereich Physik, Freie Universit?t Berlin, Arnimallee 14, 14 195 Berlin, Germany, DE
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Abstract: | The magnetization of 10-nm Gd films on W (110) has been investigated with second-harmonic generation (SHG). We observed a
strong second-harmonic (SH) yield, which we attribute to resonance enhancement by the well-known Gd (0001) d-like surface
state above the Fermi level. Since this state is spin-polarized it enhances the magnetic SHG contrast. The contrast, the relative
phase between odd and even SH fields, and the amplitude ratio of these fields depend strongly on wavelength, which confirms
the resonance enhancement. Further proof is provided by the fact that oxidation of the Gd surface reduces the SH yield by
an order of magnitude.
Received: 16 October 2001 / Revised version: 21 March 2002 / Published online: 11 June 2002 |
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Keywords: | PACS: 75 70 Ak 42 65 Ky 78 20 Ls |
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