Spin-polarized LEED

Spin-polarized LEED theory (relativistic spin-dependent effects are added to a dynamical theory) ... 

There are variations of LEED that use positrons (low energy positron diffraction, or LEPD)/8/ or spin-polarized electrons as a probe./9/ The latter technique is especially useful as a probe of magnetic ordering in surfaces. Spin-polarized LEED, or SPLEED, has been used to study surface magnetism and phase transitions on nickel. 

PED PES PEXAES PLEED Photoelecfron Diffraction Photoelecfron Spectroscopy Photoemission Extended X-ray Absorption Eine Structure (Spin-) Polarized LEED ... 

SEELES SEXAES SIMS SPLEED Surface Electron Energy Loss Fine Structure Surface Extended X-ray Absorption Fine Sfructure Secondary Ion Mass Spectroscopy Spin-Polarized LEED ... 

Similar to LEED, except the incident electron beam is spin -polarized. This is particularly useful for the study of surface... 

To deal with the electronic structure of surfaces within the framework of the spin-polarized relativistic KKR formalism, the standard layer techniques used for LEED and photoemission investigations (Pendiy 1974) have been generalized by several authors (Fluchtmann et al. 1995 Scheunemann et al. 1994). As an alternative to this, Szunyogh and co-workers introduced the so-called screened version of the KKR method (Szunyogh et al. 1994, 1995). A firm basis for this approach has been supplied by the tight-binding (TB) KKR scheme introduced by Zeller etal. (1995). The corresponding spin-polarized relativistic version has been applied by various authors to multilayer and surface-layer systems (Nonas et al. 2001). 

Here the sum runs over all possible initial states and the operator describes the interaction of the electrons and the radiation field with wave vector q and polarization A. In Eq. (1) it has been assumed that the detector selectively counts photo electrons with energy E, wave vector k, and spin polarization rus. The corresponding final state 1 5" is therefore identical to a time reversed LEED state with... 

SP-LEED Spin-polarized low energy electron diffraction... 

Figure 7.2 Diffraction of spin-polarized low energy electrons (SP-LEED). (a) Schematic description of the experimental phenomenology, (b) Evaluation of the reflected intensities ia depending on the direction of spin polarization (a = -h or —) and magnetization p, = + or —) with respect to the normal of the scattering plane [3].

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