MAGNETIC LINEAR DICHROISM IN SPIN-RESOLVED GD 4F PHOTOEMISSION

Gd 4f photoemission excited by linearly polarized radiation is shown t o exhibit a magnetic dichroism, similar to that reported earlier for F e 3p and 2p photoemission. The dichroism can be observed if electric r adiation field, sample magnetization, and electron emission form a chi ral system. The results show similarities to data obtained with circul arly polarized radiation. Spin-resolved studies show that the exchange -related spin polarization has a constant sign throughout the Gd 4f sp ectrum, while the spin-orbit-related polarization switches its sign.