RESUMO
We present x-ray magnetic circular dichroism determinations of the orbital/spin magnetic moment ratios of dilute 3d-series impurities in Au (and Cu) host matrices. This is the first direct measurement of considerable orbital moments in cubic symmetry for a localized impurity in a bulk metal host. It is shown that the unquenching of orbital magnetism depends on a delicate balance of hybridization effects between the local impurity with the host and the filling of the 3d states of the impurity. The results are accompanied by ab initio calculations that support our experimental findings.
RESUMO
Nearly perpendicular magnetic hyperfine fields have been observed for the first time in the Ag "spacers" of Fe/Ag multilayers using low temperature nuclear orientation of (110)Ag(m) at 6 mK. At the same time, vibrating sample magnetometry measurements at temperatures down to 4 K have shown the magnetic anisotropy of the Fe to be in plane. The direction of the Ag hyperfine field is thus noncollinear (nearly orthogonal) to the Fe anisotropy. These results are compared with full potential linearized augmented plane wave calculations using the wien97 code.
RESUMO
Dietary data from weighed food intake records were obtained from 35 women 29 years old and older during 4 studies from 1948 to 1966. Longitudinal data were analyzed by the use of a multiple linear-regression model with year of birth and age as independent variables. With increasing age, mean intakes declined significantly for fat, saturated fatty acids, and oleic acid, and increased significantly for calcium. After accounting for cohort effects, no significant changes occurred in mean intakes of food energy, carbohydrate, protein, phosphorus, iron, thiamin, riboflavin, preformed niacin, vitamin A, and ascorbic acid. For successive year of birth, mean intakes increased significantly for protein, calcium, phosphorus, riboflavin, preformed niacin, and linoleic acid. The regression model used explained approximately 20% of the variability in intakes of food energy and most nutrients examined.
