AVS 50th International Symposium
    Applied Surface Science Thursday Sessions
       Session AS-ThM

Paper AS-ThM11
The Dispersion of Quantum Well States in Cu/Co/Cu(001)

Thursday, November 6, 2003, 11:40 am, Room 324/325

Session: Electron Spectroscopy
Presenter: Y.Z. Wu, University of California, Berkeley
Authors: Y.Z. Wu, University of California, Berkeley
C. Won, University of California, Berkeley
E. Rotenberg, Lawrence Berkeley National Laboratory
H.W. Zhao, University of California, Berkeley
N.V. Smith, Lawrence Berkeley National Laboratory
Z.Q. Qiu, University of California, Berkeley
Correspondent: Click to Email
Electrons inside a metallic thin film experience confinement in the normal direction of the film to form quantum well states (QWS) which plays a key role in a number of important properties in metallic thin films such as the oscillatory interlayer coupling, the magnetic anisotropy, the stability of magic thickness, etc. We will report the QWS study using angle resolved photoemission spectroscopy (ARPES) for Cu/Co/Cu(100) system. QWS in the normal direction were studied for both the lower and upper bands relative to the vacuum level. The QWS in both bands can be described as a whole by the phase accumulation method (PAM). The phase shift at the interface can be obtained experimentally. The experimental value of the phase shift deviates away from the value calculated by PAM. The dispersion of QWS with different in-plane momentum was studied near the normal direction. We found that the QWS dispersion depends on the Cu film thickness， and that the quantized perpendicular momentum changes with the in-plane momentum. The latter has a dramatic effect in obtaining the in-plane effective mass of the electron. The in-plane effective mass of Cu increases with the energy.