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Spin-Polarized Neutron Reflection Measurements on Atomically Thin Magnetic Layers

We have enhanced the flipping ratio of spin-polarised-neutron near-critical-angle reflectivity measurements by sandwiching thin (few atomic layers) magnetic films (area 2 cm2) between non-magnetic materials, thereby producing interference in the neutron wave field within the sandwich structure. A strongly spin dependent reflectivity is observed for a 12 Å polycrystalline Fe film at 300 K but no spin dependence is observed for ultrathin f.c.c. Fe films at 300 K.