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Münster 1999 – scientific programme

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AM: Magnetismus

AM 18: Oberfl
ächenmagnetismus II

AM 18.5: Talk

Thursday, March 25, 1999, 15:45–16:00, F5

Depopulation of majority-spin states near the Co/W(110) interface — •S. Bode, G. Kaindl, and K. Starke — Institut fuer Experimentalphysik, FU Berlin, Arnimallee 14

The Curie temperature TC of a few monolayers (ML) thin Co films on W(110) drops rapidly (400 K / ML) with decreasing Co-film thickness d, and an extrapolation of recent TC(d) data yields the absence of ferromagnetic order for the Co monolayer [1]. This finding is in contrast to the substantial ferromagnetic coupling strength previously observed for the Fe monolayer on the same substrate [2]. We report a spin-resolved investigation of the valence-band structure near the Co/W(110) interface using spin-polarized inverse photoemission (IPE). The sp-like Co(0001) surface state, which resides just below the Fermi level for thick Co films, becomes depopulated with decreasing Co-film thickness. Due to the stationary energy of this state around the 2-dimensional Brillouin-zone center, its depopulation is likely to result in a reduced magnetic moment near the Co/W(110) interface.
G. Garreau et al., Phys. Rev. B 55, 330 (1997).
N. Weber et al., Phys. Rev. B 55, 14121 (1997).

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