In this work, synchrotron x-ray measurements are reported on a set of CoCrPt media grown on NiP/Al substrates in varying base pressures. A grazing incidence geometry was employed to eliminate the large background scatter from the underlayers and amorphous substrate. The percentage of stacking faults was found to increase with increasing base pressure, varying from 9% to 30% for samples grown at 10−8 and 10−4 Torr, respectively. We have also found that the in-plane c-axis orientation is destroyed when the sample is grown at the highest base pressure of 10−4 Torr. These structural differences are found to correlate well with the magnetic properties of the media.
Abstract-The value of exchange field of two FeMn-NiFeCobased spin valves with varying thickness of the pinned ferromagnetic layer has been determined as a function of temperature. The complexities caused by thermal activation of the antiferromagnet during measurement have been overcome by the development of a measurement protocol. The values of the exchange field obtained provide a measure of the degree of order in the antiferromagnet. Thus it is possible to determine the distribution of energy barriers to reversal for the system. We find that for a 110-A-thick pinned NiFeCo layer a broad distribution exists, whereas for an
80-A layer, the distribution is bimodal and has a component subject to thermal activation at temperatures down to 260 K.Index Terms-Exchange bias, exchange interactions.
Seasonal affective disorder is becoming more widely recognised as a prevalent mood disorder in the adult population. However, few studies have investigated the link between sunlight exposure and mood in the elderly. Referrals to the community Mental Health Care for Older People (MHCOP) in the Hackney and City area, were screened for the number of patients referred with depression in three separate years (2007, 2009 and 2011) in order to determine whether more referrals were made to the service during darker months of the year (October to March) than in the lighter months of the year (April to September). When data from the three years was combined, we found no significant increase in the number of referrals to the MHCOP in the darker months (Chi squared value 1.375, p value (2 tailed) 0.2409). We observed no statistically significant seasonal pattern of referrals, this suggests that depression in older people is not more prevalent in darker months of the year.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.