30 research outputs found
Bayesian inference of nanoparticle-broadened x-ray line profiles
A single and self-contained method for determining the crystallite-size
distribution and shape from experimental x-ray line profile data is presented.
We have shown that the crystallite-size distribution can be determined without
assuming a functional form for the size distribution, determining instead the
size distribution with the least assumptions by applying the Bayesian/MaxEnt
method. The Bayesian/MaxEnt method is tested using both simulated and
experimental CeO data. The results demonstrate that the proposed method
can determine size distributions, while making the least number of assumptions.
The comparison of the Bayesian/MaxEnt results from experimental CeO with
TEM results is favorableComment: 43 pages, 13 Figures, 5 Table
400-fold reduction in saturation field by interlayering
The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable anisotropies that can convert an otherwise magnetically soft film into a magnetically hard one. We found that by interlayering such a magnetic thin film with films that are either not lattice matched or have a different crystal structure, reductions in the saturation field as large as 400-fold can be achieved. Differences in grain size appear to be responsible. © 2009 U.S. Government.link_to_subscribed_fulltex