[19p-F214-1~12] CS4 6.5 & 7.6 Code-sharing session

[19p-F214-4] Oxygen adsorption effect on surface electronic band structure in Fe(110) thin film : High-resolution ARPES

〇Seigo Souma^1,2, Kohei Honma³, Takafumi Sato^1,3, Masahito Tsujikawa^1,4, Masafumi Shirai^1,4, Takashi Takahashi^1,2,3 (1.CSRN, Tohoku Univ., 2.AIMR, Tohoku Univ., 3.Phys. Tohoku Univ., 4.RIEC, Tohoku Univ.)

Keywords:surface states, electronic structure, photoemission spectroscopy

We have performed high-resolution angle-resolved photoemission spectroscopy of oxygen-adsorbed Fe thin film on W(110) to elucidate the evolution of electronic states upon surface oxidation. After oxygen adsorption of 0.25 monolayer onto the Fe film, we found a surface state in the vicinity of the Fermi level which exhibits an undulating energy band dispersion. Our first-principles band-structure calculation indicates that this state is attributed to the spin-polarized minority band arising from the hybridization between Fe 3d and O 2p orbitals. The present result suggests that the observed surface state is related to the unusual magnetic properties of oxidized Fe surfaces.