Spin Orientation in NiO Nanoparticles
NiO was one of the earliest materials to be investigated with neutron scattering in the pioneering work of Shull et al. [1]. While the bulk system is quite well understood, the magnetic structure of NiO nanoparticles is still unresolved. The magnetic properties of nano structured materials can differ considerably from those of bulk systems. The large relative surface area can give rise to considerable surface anisotropies that can result in different spin orientations than in the corresponding bulk systems. In thin films of other materials, a spin direction perpendicular to the film plane has been found for films below a certain critical thickness, whereas the spin direction is within the plane for larger film thickness (see e.g. [2,3]). We wish to perform magnetic powder diffraction on plate-shaped NiO nanoparticles of different sizes to determine the spin orientation in the particles. [1] C. G. Shull et al., Phys. Rev. 83 (1951), 222. [2] P. J. Jensen and K. H. Bennemann, Surf. Sci. Reports 61 (2006), 129. [3] D. S. Deng et al., Phys. Rev. B 69 (2004), 172403.
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BROK Erik Stieper; DEEN Pascale Petronella; FRANDSEN Cathrine; Henrik Jacobsen; LEFMANN Kim; NILSEN Goran and RITTER Clemens. (2013). Spin Orientation in NiO Nanoparticles. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2297
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