Characterization of micro-magnetic thick film structures by neutron spin precession
Spin precession for thick film studies.
Spin precession for the study of 1 dimensionnal micromagnetic structures
We have developed new spin precession techniques for the study of micro-magnetic structures. The technique requires basically a polarized neutron reflectometer with polarization analysis. Such equipement is readily available in most neutron centers.
We have developed several experimental setup to produce neutron beams with sizes in the range 1-50µm.
Shaping micron-sized cold neutron beams
F. Ott, S. Kozhevnikov, A. Thiaville, NIMA 788 (2015) 29-34.
System of neutron microbeams from a planar waveguide.
S.V. Kozhevnikov, V.K. Ignatovich, Yu. Nikitenko et al. JETP LETTERS 102 (2015) 1-6 .
Links to pieces of software
A Matlab library for the calculation of the precession of neutron beams is available here
Examples of use
Generation of field maps
Magnetic induction field maps can be generated which include both the internal magnetization, the stray fields generated outside the magnetic object and the applied magnetic field
Calculation of adiabaticity maps
The corresponding adiabaticity maps can be plotted to evaluate the sensitivity regions and make sure that not depolarization occurs
Precession maps
It is possible to plot the precession scan maps for various magnetic configurations and applied magnetic field. The wavelength resolution spread together with the spatial resolution can be included.
