Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Focus: Progress in Spin-Polarized Electron Spectroscopies

MA 11.3: Hauptvortrag

Montag, 16. März 2015, 16:30–17:00, EB 301

Spin-resolved photoelectron spectroscopy with high efficiency and potential of full momentum analysis — •Shigemasa Suga — MPI of Microstructure Physics, Halle, Germany — Inst. of Sci. & Ind. Research, Osaka University, Osaka, Japan

Spin information on electronic structures in solids can directly be obtained by photoelectron spectroscopy (PES) and angle-resolved PES (ARPES) with use of spin detectors. However,the rather low efficiency of spin detection was a barrier for its wide use. In order to overcome this difficulty, various spin detectors were so far invented after Au Mott detector. W(001)-SPLEED[1], Fe(001)p1x1-O VLEED[2] as well as Au/Ir(001)[3] are such examples. Brief description of spin detectors and their performance as well as examples of experiments are discussed.

Since prompt measurement of spin polarization Ps with high resolutions of momentum and binding energy is required, simultaneous two-dimensional detection, Ps(EB(kx,ky)), by use of the so-called spin- momentum microscope based on a PEEM input lens and a tandem double hemispherical analyzer is developed[4]. Examples of relatively low photon energy experiments and the prospect of its use in the soft- and hard X-ray regions will be discussed.------[1]J.Kirschner, Polarized Electrons at Surfaces, Springer Tracts in Modern Physics, vol.106 (1985).[2] T.Okuda et al., J.Electron Spectrosc. Rel. Phenom. (2014) in press and Rev.Sci.Instrum.79,123117 (2008).[3] J.Kirschner et al., Phys.Rev.B88, 125419 (2013). [4] C.Tusche et al., Ultramicroscopy 130, SI 70-76 (2013) and an invited talk, Surface Science session in this conference.