Article list

Effect of Polymer Grafting on the Tribological Performance of Graphene Oxide under Ambient Air and Vacuum

Reduction of energy and material losses caused by friction (tribological phenomena) in inert, vacuum, or chemically aggressive environments and in microscale systems requires dry lubricant systems since the classical liquid lubricants lose their efficiency in such conditions. The most promising lubricants for these applications include two-dimensional layered crystals of MoS2, graphene, or hexagonal-BN. However, modification…

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Toroidal ordering of artificial magnetic systems by spontaneous symmetry breaking

Artificial magnetic structures with periodic magnetic ordering – artificial magnetic crystals – are potential media for magnetic waves. Creating order in artificial 2D magnetic structures is problematic due to the large energy barriers between many metastable states. We have studied the reduction of these energy barriers by applying an out-of-plane magnetic field. The out-of-plane field partially rotates the magnetic…

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Si-Doped GaN Cap Layer Enhances Stability and Prevents Current Collapse in HEMTs

Highly Si-doped gallium nitride (n++ GaN) layers play a key role in developing reliable high-electron-mobility transistors (HEMTs) for power and communication electronics. Our researchers from the group of III-V semiconductors investigated their growth using metal-organic chemical vapor deposition (MOCVD) at 800 °C and optimized the silicon precursor flow (SiH₄) to improve both electrical and structural…

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