Open AccessMagnetism in Nickel and Synchrotron Beam Polarization Studied by X‐ray Diffraction
Author(s) -
Laundy D.,
Brown S.,
Cooper M. J.,
Bowyer D.,
Thompson P.,
Paul D. F.,
Stirling W. G.
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049597019420
Subject(s) - synchrotron , nickel , magnetism , polarization (electrochemistry) , synchrotron radiation , diffraction , materials science , x ray , x ray crystallography , optics , physics , chemistry , condensed matter physics , metallurgy
The ratio of the magnetic to the charge form factors of nickel has been determined by white‐beam X‐ray diffraction. The measurements were made on the new UK magnetic scattering beamline (XMaS) on a dipole source at the ESRF. The data comprise the three ( h , h ,0) reflections (4,4,0), (6,6,0) and (8,8,0) and the seven high‐order ( h ,0,0) reflections (6,0,0) to (18,0,0), which doubles the range of wavevectors compared to previous studies. The data have been analysed using Hartree–Fock free‐ion wave functions and core electron polarization effects were included. The results support the interpretation of neutron data obtained at lower momentum transfer for the e g and t 2 g orbital occupancies. The polarization of the dipole source is deduced to vary from 99.88 to 99.83% between 5 and 15 keV, respectively. This high value makes it an extremely suitable source for studies of ferromagnetism.