Vectorial spin-polarization detection in multichannel spin-resolved photoemission spectroscopy using an Ir(001) imaging spin filter

TL;DR

This paper demonstrates a high-efficiency, multichannel spin-resolved photoemission spectroscopy technique using an Ir(001) spin filter, enabling detailed vectorial spin polarization detection with improved sensitivity and comprehensive spin component analysis.

Contribution

It introduces a novel Ir(001) imaging spin filter with significantly enhanced spin detection efficiency and a method for measuring all three spin polarization components simultaneously.

Findings

Spin filter efficiency increased by over 1000 times compared to standard detectors.

Effective mapping of spin filter efficiency across energies and angles.

Experimental results agree with relativistic multiple scattering calculations.

Abstract

We report on spin- and angular resolved photoemission spectroscopy using a high-resolution imaging spin filter based on a large Ir(001) crystal enhancing the effective figure of merit for spin detection by a factor of over $10^3$ compared to standard single channel detectors. Furthermore, we review the spin filter preparation, and its lifetime. The spin filter efficiency is mapped on a broad range of scattering energies and azimuthal angles. Large spin filter efficiencies are observed for the spin component perpendicular as well as parallel to the scattering plane depending on the azimuthal orientation of the spin filter crystal. A spin rotator capable of manipulating the spin direction prior to detection complements the measurement of three observables, thus allowing for a derivation of all three components of the spin polarization vector in multichannel spin polarimetry. The experimental results nicely agree with spin-polarized low energy electron diffraction calculations based on a fully relativistic multiple scattering method in the framework of spin-polarized density functional theory.