AVS 47th International Symposium
    Magnetic Interfaces and Nanostructures Monday Sessions
       Session MI-MoM

Paper MI-MoM2
Magnetic Dichroism in the Soft X ray Absorption Region of NiMnSb Ferromagnetic Alloy

Monday, October 2, 2000, 8:40 am, Room 206

Session: Magnetic Spectroscopies
Presenter: C.N. Borca, University of Nebraska, Lincoln
Authors: C.N. Borca, University of Nebraska, Lincoln
S. Stadler, Naval Research Laboratory
D. Ristoiu, CNRS Laboratoire Louis Neel, France
P.A. Dowben, University of Nebraska, Lincoln
Y.U. Idzerda, Naval Research Laboratory
J.P. Nozieres, CNRS Laboratoire Louis Neel, France
Correspondent: Click to Email
We have investigated the magnetic and electronic structure of NiMnSb alloy by soft-X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (MCD) measurements in the Mn 2p and Ni 2p core absorption regions. We have studied the unoccupied orbital symmetry of NiMnSb. The spectra display strong polarization dependence, especially at the Mn 2p threshold. The unoccupied orbital assignment will be presented as a function of temperature and light polarization. The apparent multiplet structures found in the Mn 2p XAS spectra corresponds to a tetragonal crystal field symmetry and is the origin of most of the moment in this Heusler alloy. The XAS spectrum in the Ni 2p core shows a doublet feature in both 2p3/2 and 2p1/2, resulting from the octahedral crystal field.