Comparison of magnetic linear dichroism in 4f photoemission and 4d endash 4f photoemission from Gd on Y(0001)

Magnetic linear dichroism (MLD) in 4d endash 4f resonant and 4f nonresonant photoemission (PE) is studied from thin epitaxial gadolinium films. In an angle resolved and high-energy resolution mode, experiments were conducted with the electric-field vector of the incident light perpendicular to the sample magnetization. Our results show a significant difference in behavior of MLD in resonant PE as compared to that in nonresonant PE. Off-resonance, the MLD signal is dominated by a negative feature at the low binding energy side of the peak. Near the 4d endash 4f resonance maximum, the MLD displays a plus endash minus shape, with a negative signal 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 endash 4f resonant PE may provide insight into interactions of the 4d core hole with the 4f core level in the intermediate state. copyright 1997 American Vacuum Society