Laboratoire Léon Brillouin

UMR12 CEA-CNRS

Bât. 563 CEA Saclay

91191 Gif sur Yvette Cedex

France

llb-sec@cea.fr

Neutron Spin Precession Spectroscopy
Characterization of micro-magnetic thick film structures by neutron spin precession logo_tutelle logo_tutelle 

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.

Precession.7z

 

Maj : 24/02/2016 (2539)

 

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