RESUMEN
Spatially resolved analysis of magnetic properties on the nanoscale remains challenging, yet strain and defects on this length-scale can profoundly affect a material's bulk performance. We present a detailed investigation of the magnetic properties of La0.67Sr0.33MnO3 thin films in both free-standing and nanowire form and assess the role of strain and local defects in modifying the films' magnetic properties. Lorentz transmission electron microscopy is used to measure the magnetocrystalline anisotropy and to map the Curie temperature and saturation magnetization with nanometric spatial resolution. Atomic-scale defects are identified as pinning sites for magnetic domain wall propagation. Measurement of domain wall widths and crystalline strain are used to identify a strong magnetoelastic contribution to the magnetic anisotropy. Together, these results provide unique insight into the relationship between the nanostructure and magnetic functionality of a ferromagnetic complex oxide film.
RESUMEN
Objective: An increasing number of children and youth in Canada are taking medical cannabis for complex medical conditions. While they deserve safe and consistent access to pharmacotherapy throughout the day, administrative policies on cannabis use in schools are inconsistent. A scoping review identified policies and publications associated with medical cannabis in Canadian schools. Methods: Five databases (Scopus, PubMed, CINAHL, EMBASE, and Web of Science) were searched to identify scientific literature. Legislation in each province and territory and Ministry of Education webpages were reviewed for pertinent laws and policies regarding cannabis use in schools. Results: The scientific search resulted in 1289 articles. The five included articles pertain to implications for school nurses in the United States, which are not relevant to the Canadian context. A search of Ministry of Education websites identified only one policy with information regarding medical cannabis in schools (from Ontario). Federal legislation (the Cannabis Act) does not specifically address medical cannabis in schools, and there is a lack of consistency in terminology and clarity within provincial and territorial laws. All provinces and territories prohibit smoking and vaping of cannabis on school property and some provinces prohibit any method of cannabis consumption. Conclusions: In Canada, there is a lack of guidance for medical cannabis administration, storage, and disposal in schools, with some policies explicitly prohibiting this type of treatment. This shifts the burden to families to individually create plans school by school. A federally harmonized approach to supporting children who take cannabis for medical purposes ought to be explored.