Some improvement in Fe/Si multilayered neutron polarizor by modified sputtering geometry |
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| Authors: | A Ashfaq J Stahn |
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| Institution: | a Materials Research Lab., Department of Physics, COMSATS Institute of Information Technology, Off-Raiwand Road, Lahore-54000, Pakistan
b Laboratory for Neutron Scattering, ETH Zürich and Paul Scherrer Institute, Ch-5232 Villigen, PSI, Switzerland |
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| Abstract: | Aperture geometry of magnetron sputtering unit was modified by insertion of longitudinal B] and transverse A] slits with respect to the motion of substrate. Fe-, Si-mono and Fe/Si multilayer Fe (70 Å)/Si (50 Å)]10 (called ML70) were grown with and without modified apertures. Maximum stress anisotropy was found in samples prepared with transverse modified aperture A]. X-ray reflectometry (XRR) results showed a marked difference in roughness values of interdiffusion layers Fe-Si and Si-Fe. Magnetic measurements showed coercive field strength of 50 Oe in ML70 prepared by modified aperture geometry FeA]/SiO]. A significant improvement in the neutron polarization efficiency is observed in multilayer ML70 with the use of modified aperture geometry as compared to similar sample prepared by normal aperture. |
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| Keywords: | Aperture X-ray reflectometry Stress anisotropy Fe/Si Multilayer Magnetic anisotropy Polarization efficiency |
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