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

Paper MI-ThP4
Unique Photoelectron Spectrometers for Spin-Polarized Photoemission Studies

Thursday, November 5, 1998, 5:30 pm, Room Hall A

Session: Magnetic Interfaces and Nanostructures Poster Session
Presenter: G.D. Waddill, University of Missouri, Rolla
Authors: G.D. Waddill, University of Missouri, Rolla
A. Jones, University of Missouri, Rolla
T.R. Cummins, University of Missouri, Rolla
J.G. Tobin, Lawrence Livermore National Laboratory
S.R. Mishra, Virginia Commonwealth University
D.P. Pappas, National Institute of Standards and Technology
R. Negri, Physical Electronics, Inc.
E. Peterson, Physical Electronics, Inc.
R. Gunion, ESG Consulting
M. Hochstrasser, Pennsylvania State University
R.F. Willis, Pennsylvania State University
Correspondent: Click to Email
The design and performance of two novel photoelectron spectrometers for elementally-specific spin-polarized measurements of magnetic surfaces and thin films are presented. Both instruments combine a large diameter hemispherical electron energy analyzer with a unique electron detection scheme that can be switched in situ between spin-dependent and spin-independent measurements. Spin-polarization is determined by use of a mini-Mott detector. Spin-independent measurements can be made using an energy dispersive multi-channel electron detection scheme. One instrument has a fixed angle between the incident photons and the detected photoelectrons, while use of a novel electron lens system enables this angle to be varied through a wide range for the second instrument. Both instruments are based at the Advanced Light Source (the fixed angle instrument at the Spectromicroscopy Facility, and the variable angle instrument at the Elliptically Polarized Undulator). Results of preliminary investigations of both magnetic and nonmagnetic materials using variants of magnetic x-ray linear and circular dichroism will be presented. The work at UMR and PSU was supported by the Department of Energy, Office of Basic Energy Sciences (DE-FG02-96ER45595). The work at LLNL was performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under contract number W-7405-ENG-48. The Spectromicroscopy Facility, the Elliptically Polarized Undulator, and the Advanced Light Source were constructed and are operated with the support of the Department of Energy, Office of Basic Energy Sciences.