A new imaging concept in spin polarimetry based on the spin-filter effect

The concept of an imaging-type 3D spin detector, based on the combination spin-exchange interactions in ferromagnetic (FM) film and selectivity electron–photon conversion effect a semiconductor heterostructure, is proposed demonstrated model system. This novel multichannel idea direct transfer 2D spin-polarized electron distribution to image cathodoluminescence (CL). detector hybrid structure consisting thin magnetic layer deposited allowing measurement spatial polarization-dependent CL intensity from injected free electrons. use spin-dependent transmission through in-plane magnetized FM for detection by measuring recombined electrons transmitted semiconductor. For incoming with out-of-plane polarization, circularly polarized light can be detected holes In order demonstrate ability solid-state image-type mode operation, prototype was developed, which consists compact proximity focused vacuum tube source [ p -GaAs(Cs,O)], negative affinity (NEA) photocathode target [semiconductor heterostructure quantum wells also NEA]. injection low-energy into varying kinetic energy range 0.5–3.0 eV up 1.3 keV studied mode. figure merit as function temperature determined. asymmetry ferromagnetic/semiconductor (FM-SC) junction provides optical method polarization free-electron beams FM-SC has potential realizing vectorial reconstruction momentum microscope angle-resolved photoelectron spectroscopy systems.