Competing anisotropies in bcc Fe81Ni19/Co(001) superlattices

Contains fulltext : 75351.pdf (publisher's version ) (Open Access)3 p

Magnetic anisotropy and evolution of ground-state domain structures in bcc Fe81Ni19/Co(001) superlattices

Contains fulltext : 71918.pdf (publisher's version ) (Open Access)15 p

Thermal stability of photovoltaic a-Si:H determined by neutron reflectometry

Neutron and X-ray reflectometry were used to determine the layer structure and hydrogen content of thin films of amorphous silicon (a-Si:H) deposited onto crystalline silicon (Si) wafers for surface passivation in solar cells. The combination of these two reflectometry techniques is well suited for non-destructive probing of the structure of a-Si:H due to being able to probe buried interfaces and having sub-nanometer resolution. Neutron reflectometry is also unique in its ability to allow determination of density gradients of light elements such as hydrogen (H). The neutron scattering contrast between Si and H is strong, making it possible to determine the H concentration in the deposited a-Si:H. In order to correlate the surface passivation properties supplied by the a-Si:H thin films, as quantified by obtainable effective minority carrier lifetime, photoconductance measurements were also performed. It is shown that the minority carrier lifetime falls sharply when H has been desorbed from a-Si:H by annealing. (C) 2014 AIP Publishing LLC.</p

Hydrogen-induced lattice expansion in a (001)-oriented Mo/V superlattice

The hydrogen-induced lattice expansion in a Mo/V single-crystal superlattice (L(V)/L(Mo)=2 nm/2 nm) has been studied by x-ray diffraction in the temperature range 20-500 degrees C and hydrogen pressures ranging from 5-625 torr in a vacuum x-ray furnace. F</p

Influence of compressive biaxial strain on the hydrogen uptake of ultrathin single-crystal vanadium layers

We have investigated the influence of biaxial compressive strain on the thermodynamic properties of hydrogen in thin, single-crystal vanadium layers (0.9, 1.6, and 2.0 nm). At H/V&lt;0.1 (atomic ratio), the host-mediated H-H interaction was found to be attra</p