Demagnetization of the Ni(100) Surface by Hydrogen Adsorption

Abstract
The spin polarization of field-emitted electrons from the (100) plane of field-evaporated Ni single-crystal tips is observed to decrease from -(3.0±1)% to (0±1)% upon hydrogen adsorption (full coverage). We interpret these results as evidence for a strong reduction of the ferromagnetism of the d electrons of the Ni surface atoms upon hydrogen chemisorption.