Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 54: Magnetic textures: Transport and dynamics III

MA 54.1: Talk

Friday, April 5, 2019, 09:30–09:45, H37

Development of a Miniature Polarisation Analysis Device — •Ran Tang¹, Henrik Gabold¹, Robert Georgii², and Peter Böni¹ — ¹James-Franck-Str. 1, Physik-Department E21, TU München, 85748 Garching, Germany — ²Lichtenbergstr. 1, MLZ, 85748 Garching, Germany

Spherical neutron polarimetry (SNP) has been systematically developed and applied over the last decades since the cryogenic polarisation analysis device (CryoPAD) presented by Tasset et al. in 1989. This technique allows to determine all the nine components in the polarisation matrix at once and therefore to solve the Blume-Maleyev equations. The biggest advantage of SNP over conventional polarisation analysis methods is the ability to separate nuclear and magnetic contributions in the scattering processes even with finite nuclear-magnetic interference terms. Hence the magnetic properties, e.g. magnetoelectricity, non-collinear magnetic structures, different types of magnetic domains in antiferromagnetic structures, and commensurate and incommensurate structures, can be finely determined. Inspired by the CryoPAD, the Mu-metal Polarisation Analysis Device (MuPAD) presented by Janoschek et al., and the following Mini MuPAD, introduced by Haslbeck and Kindervater et al., with a more compact form, we want to report on the currently being developed cylindrical Mini PAD. In comparison to the existing Mini MuPAD, the precession coils are bent into cylindrical shape around the sample, and the scattering angles are hence no longer restricted to be smaller than 10°. Furthermore, thanks to its size, it is simple to handle and can be combined with a cryostat.