AVS 45th International Symposium
    Magnetic Interfaces and Nanostructures Technical Group Thursday Sessions
       Session MI-ThM

Paper MI-ThM6
Combined Spin Polarized Photoemission and Inverse Photoemission of Rare Earth Surface States

Thursday, November 5, 1998, 10:00 am, Room 324/325

Session: Magnetic Spectroscopies
Presenter: T. Komesu, University of Nebraska, Lincoln
Authors: T. Komesu, University of Nebraska, Lincoln
C. Waldfried, University of Nebraska, Lincoln
P.A. Dowben, University of Nebraska, Lincoln
Correspondent: Click to Email
The surface of gadolinium has been a subject of much controversy over past years, as to what extent spin mixing and/or Stoner-like exchange coupling are the predominant ingredients of magnetic ordering. The contention is stimulated by the complication that the Gd(0001) surface state is located in the direct vicinity of the Fermi level. For strained Gd(0001) grown of Mo(112), the situation is far worse.@footnote 1@ The surface state is composed of partially occupied spin majority and minority states that extend across the Fermi level into the unoccupied region. Consequently, the magnetic and electronic structure of the Gd(0001) surface cannot be studied by a single experimental technique. Rather the two complementary techniques of photoelectron spectroscopy (PES) and inverse photoemission spectroscopy (IPES) are necessary for a comprehensive investigation of the Gd(0001) surface electronic structure. In this work, we study the surface magnetic structure of strained Gd(0001) through a combination of spin-polarized PES, and spin-polarized IPES. We also find that oxygen antiferromagnetically aligns the surface for strained Gd(0001) which is distinctly different from the case of unstrained Gd(0001).@footnote 2@ @FootnoteText@ @footnote 1@C. Waldfried, T. McAvoy, D. Welipitiya, E. Vescovo and P. A. Dowben, submitted; C. Waldfried, T. McAvoy, D. Welipitiya, P. A. Dowben and E. Vescovo, Europhys. Lett. (1998) in press @footnote 2@D. N. McIlroy, C. Waldfried, D. Li, J. Pearson, S. D. Bader, D. -J, Huang, P. D. Johnson, R. F. Sabirianov, S. S. Jaswal and P. A. Dowben, Phys. Rev. Lett. 76, 2802 (1996)