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The utilization of polarized neutrons is of great importance in scientificdisciplines spanning materials science, physics, biology, and chemistry.Polarization analysis offers insights into otherwise unattainable sampleinformation such as magnetic domains and structures, protein crystallography,composition, orientation, ion-diffusion mechanisms, and relative location ofmolecules in multicomponent biological systems. State-of-the-art multilayerpolarizing neutron optics have limitations, particularly low specularreflectivity and polarization at higher scattering vectors/angles, and therequirement of high external magnetic fields to saturate the polarizermagnetization. Here, we show that by incorporating 11B4C into Fe/Simultilayers, amorphization and smooth interfaces can be achieved, yieldinghigher neutron reflectivity, less diffuse scattering and higher polarization.Magnetic coercivity is eliminated, and magnetic saturation can be reached atlow external fields (>2 mT). This approach offers prospects for significantimprovement in polarizing neutron optics, enabling; nonintrusive positioning ofthe polarizer, enhanced flux, increased data accuracy, and furtherpolarizing/analyzing methods at neutron scattering facilities.

Reflective, polarizing, and magnetically soft amorphous Fe/Si multilayer  neutron optics with isotope-enriched 11B4C inducing atomically flat  interfaces