INFLUENCE OF PHOTOELECTRON DIFFRACTION ON MAGNETIC LINEAR DICHROISM

We studied the influence of photoelectron diffraction on magnetic line ar dichroism and spin polarization in Co and Fe 3p photoemission excit ed by linearly polarized synchrotron radiation. We find a strong varia tion of the magnetic linear dichroism with emission direction. The spi n polarization related to the spin-orbit interaction varies in a simil ar manner. This angular variation closely tracks that of the magnetic dichroism. In contrast, the exchange-induced spin polarization (-12 2)% does not vary appreciably with emission angle. These findings sugg est that the main cause for the observed effects is the angular moment um character of the photoelectron wave.