High-resolution spectrometer for spin-polarized electron spectroscopies of ferromagnetic materials

A UHV apparatus for spin-polarized electron spectroscopies with high energy and angle resolution (ΔE=100 meV, ΔΘ=±3 °) is described. The energy dispersive element is a 180 ° hemispherical analyzer. Spin polarization is measured by a Mott detector (100 kV) whose efficiency is increased by employing multidetectors. The transmission of the electron optical system is optimized. An electron gun or an UV resonance lamp can be used as excitation sources. The performance of the setup is demonstrated by measurements of the spin polarization of electron-excited secondary electrons and spin-polarized energy-and angle-resolved photoemission spectra from Ni(110).