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|Author(s):||A Seiler; C Feigerle; J Pena; Robert Celotta; Daniel T. Pierce;|
|Title:||Connection Between Surface Magnetism and Electronic Structure of Oxygen on Ni(110)|
|Published:||January 01, 1985|
|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|
|Pages:||pp. 3638 - 3640|