Generation of a spin-polarized electron beam by multipole magnetic fields

The propagation of an electronbeam in the presence of transverse magnetic fields possessing integer topological charges is presented.The spin–magnetic interaction introduces ano nuniform spin precession of the electrons that gains a space-variant geometrical phase in the transverse plane proportional to the fields topological charge, whose handedness depends on the input electrons spin state. A combination of our proposed device with an electron orbital angular momentum sorter can be utilized as a spin-filter of electron beams in a mid-energy range.