Polarized SANS investigation of magnetic nanowires
In this experiment, we intend to investigate magnetic nanowires through Polarized SANS measurements. The main aim is to determine the magnetic form factors of these elongated objects and the mechanisms which govern the magnetization reversal process. This experiment should allow to confirm previous measurements performed at LLB which indicated that stray fields cannot be neglicted in SANS measurements as it is usually done : Surprisingly, a magnetic contrast was observed at lower Q-values than expected (Q < 0.4nm-1) and was maximal around 0.1 nm-1. We estimate that these results provide a strong hint that stray fields between elongated nano-objects should be included in the magnetization model whereas it is often neglected in the literature on nano-objects without real theoretical justification. Three kinds of samples will be examined (amorphous Co nanowires, hcp Co nanowires with the axis c along the long axis and hcp Co nanowires with the axis c perpendicular to the long axis). We consider that D33 is optimal for our study and we are asking for 10 days of beam time on D33 (D22 could obviously be a very valuable alternative).
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MAURER Thomas; CAGNON LAURENT; CHABOUSSANT Gregory; FRUCHART Olivier and HONECKER Dirk. (2013). Polarized SANS investigation of magnetic nanowires. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-770
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