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

Document Type

Article

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.