AVS 51st International Symposium
    Nanometer-scale Science and Technology Monday Sessions
       Session NS-MoA

Paper NS-MoA6
Spin-Resolved Core Level Photoemission of Ferromagnetic Thin Films

Monday, November 15, 2004, 3:40 pm, Room 213D

Session: Magnetic Imaging and Spectroscopy
Presenter: G.D. Waddill, University of Missouri-Rolla
Authors: G.D. Waddill, University of Missouri-Rolla
T. Komesu, University of Missouri-Rolla
S.A. Morton, Lawrence Berkeley National Laboratory
J.G. Tobin, Lawrence Livermore National Laboratory
Correspondent: Click to Email
We present spin-resolved 2p core level photoemission results for thin films of Fe, Co, and Ni. The films are bcc Fe on a Ag(100) substrate, fcc Co on Cu(001), and fcc Ni/Co/Cu(001). All films have an in-plane magnetic easy axis. We observe spin polarization in the main photoemission peaks consistent with trends in the bulk magnetic moments of the transition metals. In addition, Ni and Co have satellite peaks due to electron correlation effects and we see spin polarization in the Ni 6 eV satellite peak and much weaker spin polarization in the 4 eV Co peak. The existence of a satellite peak in the Co 2p spectrum is somewhat controversial and this data marks the first observation of spin-polarization in that peak. In addition, in the Ni/Co/Cu(001) system we have preliminary results for very thin films of Ni where charge transfer from the Co to the Ni will effect the electronic and magnetic properties of both films. For a 3 monolayer Ni film on Co we see differences in the photoelectron spin polarization of both Co and Ni compared to results for thicker Ni and Co films. These results emphasize the importance of spin-resolved photoemission in understanding the combined Coulomb, spin-orbit, and exchange interactions in the presence of interatomic electron correlation effects and configuration mixing that effect the photoemission process.