Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 29: Micro- and Nanostructured Magnetic Materials II
MA 29.8: Vortrag
Mittwoch, 16. März 2011, 12:45–13:00, HSZ 103
Investigation of magnetic nanostructures by means of neutron-polarisation analysis — •Dirk Honecker1, Frank Döbrich1, Charles Dewhurst2, Albrecht Wiedenmann2, Cristina Gómez Polo3, Kiyonori Suzuki4, and Andreas Michels1 — 1Laboratory for the Physics of Advanced Materials, University of Luxembourg, Luxembourg — 2Institut Laue-Langevin, Grenoble, France — 3Departamento de Física, Universidad Pública de Navarra, Pamplona, Spain — 4Department of Materials Engineering, Monash University, Clayton, Australia
Small-angle neutron scattering (SANS) is a very powerful technique for the investigation of magnetic nanostructures since it provides information from within the bulk of the material and on a length scale of a few to some hundred nanometres. SANS is commonly utilised with an unpolarised or a polarised incident neutron beam, where an analysis of the spin state of the neutron after the scattering process is not performed. Due to the recent development of efficient 3He spin filters, it becomes possible now to perform routinely longitudinal neutron-polarisation analysis (POLARIS) in a SANS experiment. In this contribution, we discuss the equations of the non-spin-flip and spin-flip cross sections for bulk ferromagnets along with typical angular anisotropies and asymmetries. In order to demonstrate the potential of the POLARIS technique, we present results on nanocrystalline cobalt and on Fe based soft magnetic nanocomposites.