Practical use of waveguides for polarized neutrons studies
  We present the use of planar waveguides to produce neutron microbeams in order to investigate magnetic micro-structures with a micrometric spatial resolution. We report experimental results on such measurements on a polarized neutron reflectometer using a nonmagnetic waveguide structure to probe an amorphous magnetic microwire. The spin-resolved transmission of a neutron microbeam through a microwire was studied. The one dimensional mapping of the neutron precession across the wire was measured. 
S. V. Kozhevnikov, T. Keller, Yu. N. Khaydukov, F. Ott, A. R\"uhm, A.   Thiaville, J. Torrej\'on, M. V\'azquez and J. Major
cond-mat.mes-hall cond-mat.mtrl-sci physics.ins-det