Thermal reversible breakdown and resistivityswitching in hafnium dioxide

HfO2 nanostructures are currently considered to be very promising for different applications including gate oxides in Si transistors and emerging nonvolatile memory cells such as resistive random access memory (RRAM). For RRAM development a clear understanding of switching mechanisms from a HRS to a LRS is demanding. Several models were proposed to explain the switching effect [1-3], however, they did not cover comprehensively experimental observations. It is experimentally shown by means of high resolution transmission electron microscopy that formation of CFs with diameters of 30-50 nm in HfO2 occurred by an electrical pretreatment [2]. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2055

Nanostructured formations and coatings created on the surface of materials exposed to compression plasma flows

The paper presents the results of investigations on changing silicon and aluminium morphology under the action of compression plasma flows generated by the quasi-stationary plasma accelerator (magnetoplasma compressor type). The feasibility of spraying nanostructured metal films by compression flows was demonstrated. The resulting single-layer coating consists of spherical particles measuring 50 to 200 nm. Such particles bonded to each other cover a surface relief including flat areas and regular structures developing during plasma action. The state and composition of a sample surface were studied by SEM- and EXD-methodsПредставлено результати досліджень зміни морфології поверхні пластин кремнію й алюмінію при впливі на них компресійними плазмовими потоками, що генеруються квазістаціонарним плазмовим прискорювачем типу магнітоплазмовий компресор. Продемонстровано можливість нанесення на підкладки наноструктурних металевих покрить за допомогою компресійних потоків.Представлены результаты исследований изменения морфологии поверхности пластин кремния и алюминия при воздействии на них компрессионными плазменными потоками, генерируемыми квазистационарным плазменным ускорителем типа магнитоплазменный компрессор. Продемонстрирована возможность нанесения на подложки наноструктурных металлических покрытий с помощью компрессионных потоков

Impact of aligned carbon nanotubes array on the magnetostatic isolation of closely packed ferromagnetic nanoparticles

International audienceWe investigate the influence of carbon nanotubes (CNT) aligned array on the magnetic properties of ensemble of densely packed Co nanoparticles (NPs) embedded inside CNT. Each CNT contains only one nanosized Co. Such a special structure was formed by catalyst chemical vapor deposition (CCVD) activated by current discharge plasma and hot filament. The Co NPs, previously deposited onto SiO 2 /Si substrate, acted as a catalyst. By varying the parameters of the CCVD process, we were able to also sputter the substrate instead of CNT growth. Co NPs were used as a mask and the structure of Si-based nano-cones with Co NPs on the top of each cone was formed. Exhaustive investigation of the structural, morphology and crystalline properties of Co nanoparticles were performed. The magnetic properties of two kinds of samples, Co on the Si-based nanocone and Co inside CNT, were differ drastically. In the former case, the magnetic anisotropy of thin-film-type has been observed with large magnetic domains. Whereas for the Co-CNT samples ferromagnetic NPs were magnetically isolated. It was established that the magnetic anisotropy of nanosized Co plays more dominant role than the dipole interaction between Co NPs. The role of the CNT container in this is discussed

Successive implantation of aluminium by carbon and nitrogen ions

Successive implantation of aluminium by carbon and nitrogen ions / A. Wenzel ... - In: Surface and coatings technology. 103/104. 1998. S. 312-31