January 24, 2019

Spin-resolved Photoelectron Microscopy

Imaging Spin-Filter

  The promise of the spin-resolved experiments throughout the surface Brillouin zone has been severely hindered for decades, due to the extremely low spin-detection efficiency [1]. Major advances have been made via the recent invention of the multi-channel spin-polarization detector, the so-called imaging spin filter [2]. It provides a stunning increase in spin-detection efficiency by four orders of magnitude, in comparison to conventional single-channel electron spin detectors [1,2].



  1. Suga, S. and Tusche, C., Photoelectron spectroscopy in a wide hν region from 6eV to 8keV with full momentum and spin resolution, J. Electron. Spectrosc. Relat. Phenom., 200, 119-142 (2015).
  2. Tusche, C., Krasyuk, A. and Kirschner, J., Spin resolved bandstructure imaging with a high resolution momentum microscopeUltramicroscopy, 159, 520-529 (2015).
Rashba­ surface states

  Measured spin polarization and intensity map at EF of the Au(111) Rashba-split surface state excited by p-polarized 6.05 eV photons with respect to the quantization axis indicated by P. Note the 2D color code for intensity and spin polarization.  
Magnetic domains: magnetite (Fe3O4)

  For the first time, on magnetite (001) the near surface real-space reorganization of the magnetic domains has been followed in detail by utilizing spin-resolving momentum microscopy, both upon crossing the Verwey transition when cooling and when heating. The illumination is performed by a He I lamp, and the energy of the secondary electrons is Ef + 5.82 eV.