COMPARISON OF MAGNETIC LINEAR DICHROISM IN 4F PHOTOEMISSION AND 4D-4FPHOTOEMISSION FROM GD ON Y(0001)

Magnetic linear dichroism (MLD) in 4d-4f resonant and 4f nonresonant p hotoemission (PE) is studied from thin epitaxial gadolinium films. In an angle resolved and high-energy resolution mode, experiments were co nducted with the electric-field vector of the incident light perpendic ular to the sample magnetization. Our results show a significant diffe rence in behavior of MLD in resonant PE as compared to that in nonreso nant PE. Off-resonance, the MLD signal is dominated by a negative feat ure at the low binding energy side of the peak. Near the 4d-4f resonan ce maximum, the MLD displays a plus-minus shape, with a negative signa l at the low binding energy side of the 4f peak and a positive signal at the high binding energy side. Analysis of MLD in 4d-4f resonant PE may provide insight into interactions of the 4d core hole with the 4f core level in the intermediate state. (C) 1997 American Vacuum Society .