INVERSE-PHOTOEMISSION FROM V, CR, MN, FE, AND CO MONOLAYERS ON AG(100)

Well ordered 1 X 1 monolayers of transition metals are grown on Ag(100) at 440 K. Using inverse photoemission we obtain the position of the unoccupied 3d states versus band filling. At k(parallel-to)=0 the minority-spin state of DELTA5 symmetry (d(xz,yz)) is found at 2.1, 1.6, 1.4, 0.5, and 0.25 eV above the Fermi level for V, Cr, Mn, Fe, and Co monolayers. For V a majority-spin feature is observed at 0.7 eV. For the Cr monolayer we obtain a magnetic exchange splitting of 2.7 eV using previous photoemission results for the majority-spin state. This is 20 times as large as in bulk Cr, suggesting a strong enhancement of the local magnetic moment in the monolayer. Our results are consistent with first-principles calculations for the magnetic configurations with the lowest energy, i.e., antiferromagnetic V, Cr, and Mn, and ferromagnetic Fe and Co monolayers on Ag(100).