Connection Between Surface Magnetism and Electronic Structure of Oxygen on Ni(110)

Published

January 1, 1985

Author(s)

A Seiler, C Feigerle, J Pena, Robert Celotta, Daniel T. Pierce

Abstract

The d-band holes which give rise to ferromagnetism in Ni can be directly observed by spin-polarized inverse photoelectron spectroscopy (SPIPES). Only incident electrons polarized in the minority spin direction can fall into unfilled minority spin states and radiate a detected photon. On dissociative chemisorption of O₂ we observe a reduction in the number of minority spin d holes. It is this change in electronic structure which gives rise to a decrease in magnetization. A background of minority and majority spin states remains essentially unchanged. Further exposure to oxygen causes formation of NiO; the surface magnetization goes to zero, and a completely different SPIPES spectrum is observed. The relative importance of d electrons and s, p electrons in chemisorptive bonding on Ni has been much discussed. These data suggest that the d states interact strongly with the oxygen and that this interaction has a profound influence on the surface magnetism.

Citation

Journal of Applied Physics

Volume

57

Issue

8

Pub Type

Journals

Citation

Seiler, A. , Feigerle, C. , Pena, J. , Celotta, R. and Pierce, D. (1985), Connection Between Surface Magnetism and Electronic Structure of Oxygen on Ni(110), Journal of Applied Physics (Accessed September 13, 2024)