The Polarization of Sb Overlayers on NiMnSb(100)

Authors

Takashi Komesu, University of Nebraska-LincolnFollow
C.N. Borca, University of Nebraska-Lincoln
Hae-Kyung Jeong, University of Nebraska-LincolnFollow
Peter A. Dowben, University of Nebraska-LincolnFollow
Delia Ristoiu, CNRS Laboratoire Louis Nee´l, 25 aÍenue des Martyrs BP 166, 38042 Grenoble CEDEX 09, France
J.P. Nozieres, CNRS Laboratoire Louis Nee´l, 25 aÍenue des Martyrs BP 166, 38042 Grenoble CEDEX 09, France
Shane Stadler, Naval Research Laboratory, Materials Physics Branch, Washington DCFollow
Y.U. Idzerda, NaÍal Research Laboratory, Materials Physics Branch

Date of this Version

2000

Comments

Published in Physics Letters A 273 (2000) 245–251.

Abstract

We have investigated the induced polarization of paramagnetic Sb overlayers on the Heusler alloy NiMnSb. From combined X-ray absorption spectroscopy (XAS) and spin-polarized inverse photoemission spectroscopy (SPIPES), we can assign some of the unoccupied states of the Heusler alloy NiMnSb. With increasing thickness of the Sb overlayer, there is a decline in the density of states near the Fermi energy, as expected for a semimetal overlayer on a metallic substrate. While the Sb is polarized by the ferromagnetic NiMnSb substrate, consistent with the expectations of mean field theory, the polarization at the center of the surface/overlayer Brillouin zone cannot be easily related to the induced magnetization.