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

Jacopo Valsecchi, Ralph P. Harti, Marc Raventós, Muriel D. Siegwart, Manuel Morgano, Pierre Boillat, Markus Strobl, Patrick Hautle, Lothar Holitzner, Uwe Filges, Wolfgang Treimer, Florian M. Piegsa and Christian Grünzweig ()
Additional contact information
Jacopo Valsecchi: Paul Scherrer Institut
Ralph P. Harti: Paul Scherrer Institut
Marc Raventós: Paul Scherrer Institut
Muriel D. Siegwart: Paul Scherrer Institut
Manuel Morgano: Paul Scherrer Institut
Pierre Boillat: Paul Scherrer Institut
Markus Strobl: Paul Scherrer Institut
Patrick Hautle: Paul Scherrer Institut
Lothar Holitzner: Paul Scherrer Institut
Uwe Filges: Paul Scherrer Institut
Wolfgang Treimer: University of Applied Sciences
Florian M. Piegsa: University of Bern
Christian Grünzweig: Paul Scherrer Institut

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The intrinsic magnetic moment of a neutron, combined with its charge neutrality, is a unique property which allows the investigation of magnetic phenomena in matter. Here we present how the utilization of a cold polarized neutron beam in neutron grating interferometry enables the visualization and characterization of magnetic properties on a microscopic scale in macroscopic samples. The measured signal originates from the phase shift induced by the magnetic potential. Our method enables the detection of previously inaccessible magnetic field gradients, in the order of T cm−1, extending the probed range by an order of magnitude. We visualize and quantify the phase shift induced by a well-defined square shaped uniaxial magnetic field and validate our experimental findings with theoretical calculations based on Hall probe measurements of the magnetic field distribution. This allows us to further extend our studies to investigations of inhomogeneous and anisotropic magnetic field distribution.

Date: 2019
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DOI: 10.1038/s41467-019-11590-2

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