Magnetic Exchange Splitting of Electronic Surface States on Ni(110)

The temperature-dependent magnetic exchange splitting of an electronic surface state located at the $\overline{S}$ point of the Ni(110) surface Brillouin zone has been measured. The measured value of the splitting is 0.30±0.02 eV at 100 K which is equal to the exchange splitting of the bulk bands of Ni (0.31±0.04 eV) from which this surface state is derived. This result directly rules out the existence of a paramagnetic or magnetically "dead" surface layer on Ni(110).