title: Spin-polarized tunneling spectroscopy of co(0001) surface States.
abstract: Spin-polarized tunneling was studied on Co surfaces of exchange coupled Co/Cu/Co samples, using an Fe tip. A spin-polarized surface state of Co(0001) was found to exist at -0.43 eV relative to E(F), with FWHM of 0.23 eV in the spectra. The state exhibits negative magnetoresistance with an effective spin polarization of less than -23%, suggesting negatively high spin polarization of the surface state. Our first-principles calculations have supported the existence of the surface state. From the calculation, the state is identified as a minority spin Gamma-centered d(2)(z)-like surface state.
authors.affiliation: Corporate R&D Center, Toshiba Corporation, Kawasaki 212-8582, Japan. shiho.okuno@toshiba.co.jp
authors.forename: S N
authors.initials: SN
authors.lastname: Okuno
authors.forename: T
authors.initials: T
authors.lastname: Kishi
authors.forename: K
authors.initials: K
authors.lastname: Tanaka