Magnetic ToF GISANS on self-assembled nanoparticles

Nanoparticle superlattices can be considered as novel type of materials with controllable electronic, optical and magnetic properties. Their building blocks are nanoparticles (or ``nanocrystals'') from a metallic, metal-oxide, or semiconducting material or hybrid between different materials. Using self-assembling techniques it is possible to create a large amount of highly ordered 3D structures, which we have investigated for their structural and magnetic properties. The lateral ordering is quantified using electron microscopy and grazing incidence small angle X-ray scattering (GISAXS) [1,2,4]. The macroscopic magnetic behavior and correlations are investigated by superconducting quantum interference device (SQUID) magnetometry [1,3]. Utilizing the time of flight (ToF) magnetism reflectometer at SNS the magnetic correlations have been studied with polarized GISANS and PNR. \\[4pt] [1] M. J. Benitez et al., J. Phys.: Condens. Matter 23, 126003 (2011).\\[0pt] [2] G. A. Badini Confalonieri et al., Nanotechnology 22, 285608 (2011).\\[0pt] [3] A. Ebbing et al., Phys. Rev. B. 84, 012405 (2011).\\[0pt] [4] D. Mishra et al., Nanotechnology 23, 055707 (2012).\\[0pt] [5] E. Josten et al. (unpublished).