Investigation of the thermal tolerance of silicon-based lateral spin valves.

Improvement in the thermal tolerance of Si-based spin devices is realized by employing thermally stable nonmagnetic (NM) electrodes. For Au/Ta/Al electrodes, intermixing between Al atoms and Au atoms occurs at approximately 300 °C, resulting in the formation of a Au/Si interface. The Au-Si liquid phase is formed and diffuses mainly along an in-plane direction between the Si and AlN capping layers, eventually breaking the MgO layer of the ferromagnetic (FM) metal/MgO electrodes, which is located 7 µm away from the NM electrodes. By changing the layer structure of the NM electrode from Au/Ta/Al to Au/Ta, the thermal tolerance is clearly enhanced. Clear spin transport signals are obtained even after annealing at 400 °C. To investigate the effects of Mg insertion in FM electrodes on thermal tolerance, we also compare the thermal tolerance among Fe/Co/MgO, Fe/Co/Mg/MgO and Fe/Co/MgO/Mg contacts. Although a highly efficient spin injection has been reported by insertion of a thin Mg layer below or above the MgO layer, these thermal tolerances decrease obviously.

[Effect of l-carnitine on the expression of glycine conjugates in rats in experimental B2-hypovitaminosis]. / Vliianie l-karnitina na ékspretsiiu glitsinovykh kon"ugatov u krys pri éksperimental'nom B2-gipovitaminoze.

The dynamic of glycine conjugates excretion in riboflavin deficient (RFD) rats was studied. The excretion of isovaleryl-, n-butyryl-, isobutyryl-,2-Me-butyryl- and hexanoylglycines by the RFD rats considerably increased from 1 week of the experiment and reached a plateau after 5 week. Under L-carnitine supplementation the acylglycines (isobutyryl- and isovaleryl) as well as some organic acids excretion was diminished.