Spin transport in proximity induced ferromagnetic graphene

Magnetic gates in close proximity to graphene can induce ferromagnetic correlations. We study the effect of such induced magnetization dependent Zeeman splittings on the graphene transport properties. We estimate that induced spin splittings of the order of \Delta ~ 5 meV could be achieved with the use of magnetic insulator gates, e.g. EuO-gates, deposited on top of graphene. We demonstrate that such splittings in proximity induced ferromagnetic graphene could be determined directly from the tunneling resonances in the linear response conductance, as the top gate creates also a tunable barrier in the graphene layer. We show how such splittings could also be determined independently by magnetoresistance measurements in a spin-valve geometry. Because the spin polarization of the current near the Dirac point increases with the length of the barrier, long magnetic gates are desirable for determining \Delta experimentally.Comment: 9 pages, 11 figure

Occurrence of Haemoproteus nettionis in Wood Ducks (Aix sponsa L.)

The protozoan Haemoproteus nettionis was found in 77 of 168 wood ducks (Aix sponsa L.) live-trapped on the Upper Mississippi River Wildlife and Fish Refuge in September, 1963. No parasitemia was found in 68 wood ducks live-trapped in July and August, 1959 at the Union Slough National Wildlife Refuge in north-central Iowa. A description of the parasite from wood ducks on the Upper Mississippi Refuge is presented

Some Blood Parasite and Disease Antibody Findings in Wild Rio Grande Turkeys Stocked in Iowa

Thirty-nine wild Rio Grande turkeys (Meleagris gallopavo intermedia), live-trapped near Sonora, Texas, were tested for various blood parasites and disease antibodies before being released in the Yellow River State Forest in Allamakee County, Iowa, in the fall and winter of 1960-61. Haemoproteus meleagridis was found in 79% of the 39 turkeys· Salmonella pullorum in 15%; and chicken embryo lethal orphan virus (CELO) antibodies in 1 of 9 birds tested for evidence of that disease. Ornithosis was found in one pooled sample of serum that involved 4 birds but it was absent in 15 birds. No evidence was detected for Salmonella typhimurium, Leucocytozoon, Trypanosoma, Plasmodium, Mycoplasma, Newcastle disease virus or western equine viral encephalmoyelitis