Journal: Nature Communications

Article Title: Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry

doi: 10.1038/s41467-019-11590-2

Figure Lengend Snippet: Inhomogeneous and anisotropic magnetic field simulations. a Rectangular cuboid neodymium permanent magnet characterization by three-dimensional (3D) finite element method (FEM) simulation of the magnetic field distribution, the three color-coded surfaces (yellow, light blue and red) represent the cross-section planes of the streamline plot. b x – z plane projection (yellow plane) of the magnetic field. c y – z plane projection (light blue plane) of the magnetic field. d x – y plane projection (red plane) of the magnetic field. The color code refers to the magnetic field vector’s magnitude

Article Snippet: The FEM simulation of the magnetic field distribution, for the calculation of the induced phase shift for validation of the experimental results, has been performed with the software COMSOL Multiphysics with a mesh size of 0.25 mm.

Techniques:

Journal: Nature Communications

Article Title: Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry

doi: 10.1038/s41467-019-11590-2

Figure Lengend Snippet: Experimental and calculated differential phase contrast image (DPCI) results of an inhomogeneous and anisotropic magnetic field. a – d Merged DPCI images of a rectangular cuboid neodymium permanent magnet. The insets in the upper right corners display the four different orientations of the permanent magnet according to the θ s rotation rotation angle around the vertical axis as first, then the ω s around the horizontal axis and keeping the gratings oriented parallel to the initial polarization according to the configuration ω = 0 of the homogeneous, well-defined, square-shaped, and uniaxial magnetic field. The four DPCI images are merged along the horizontal axis in order to aid the comparison between the experimental and the calculated data. The top halves have been retrieved from the experimental results, while the bottom ones have been calculated one from the finite element method (FEM) simulations. The dashed line represents the edges of the permanent magnet

Article Snippet: The FEM simulation of the magnetic field distribution, for the calculation of the induced phase shift for validation of the experimental results, has been performed with the software COMSOL Multiphysics with a mesh size of 0.25 mm.

Techniques: Comparison

Journal: Nature Communications

Article Title: Visualization and quantification of inhomogeneous and anisotropic magnetic fields by polarized neutron grating interferometry

doi: 10.1038/s41467-019-11590-2

Figure Lengend Snippet: Quantitative analysis of an inhomogeneous and anisotropic magnetic field. Case: θ s = 90°, ω s = 0°. a Cross-section of the magnetic field distribution along the x –z plane the cross-section. b Differential phase contrast image (DPCI) images, the top one is the retrieved from the experimental data while the bottom one is calculated from the finite element method (FEM) simulations. The two horizontal line profiles are mirrored at the same heights in both experimental and simulated images. c Comparison plot of the horizontal line profile at the top/bottom faces highlighting the swirling of the magnetic field near the edge. d Comparison plot of the horizontal line profile at the middle height of the permanent magnet. The area within the vertical dashed lines shows the overlap with the neodymium permanent magnet where there is no transmission, and therefore no DPCI signal

Article Snippet: The FEM simulation of the magnetic field distribution, for the calculation of the induced phase shift for validation of the experimental results, has been performed with the software COMSOL Multiphysics with a mesh size of 0.25 mm.

Techniques: Comparison, Transmission Assay