Electronic Structure and Magnetic Anisotropy in Ni/Cu(001) from Angle-Resolved Photoemission Spectroscopy

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We investigated the thickness-dependent surface energy band structures of Ni films on a Cu(001) surface by angle-resolved photoemission spectroscopy. As the Ni film grows, Ni 3d bands are formed near the Fermi level in the range of the Cu 4s bands. In the surface band dispersions measured along the \bar{\Gamma}--\bar{\Delta}--\bar{\text{X}} plane, one band with d_{z^{2}} orbital character evolves with a small shift to low binding energy up to 20 ML, while the other band with d_{x^{2}-y^{2}} orbital character gradually forms with a shift to high binding energy above 6.6 ML. Both an increase of the d_{x^{2}-y^{2}} and a decrease of the d_{z^{2}} band fillings in the Ni thickness range between 6.6 and 20 ML contribute to reinforce the perpendicular magnetic anisotropy, which are partly backed up by a first-principles energy band calculation.
2011-06-15