Present work includes a computer simulation of temperature- and pressure-induced spin transition phenomenon in a 2D spin crossover nanosystem. Modeling was carried out within a framework of an Ising-like model with the help of Monte Carlo technique based on metropolis algorithm. All the obtained results are in accordance with the experimental ones. For a fixed values of temperature, a reverse spin transition of the system was obtained. Brief review of possible practical application of such type of a system is presented.
Single-walled, armchair type carbon nanotube with mixed spins was investigated within the framework of Ising-like ferromagnetic model, by means of Monte Carlo technique based on the metropolis algorithm. According to this approach the influence of the size effect on the nanosystem behavior was investigated. The critical point of the system was obtained. The influence of the external magnetic field on the system parameters was studied. The interaction constant between nearest neighbor nodes and the temperature are the two major factors that influence the type of phase transitions in the considered nanosystem. The perspective of possible application of such carbon nanotubes in spintronics was shown.
Magnetic properties of AA and AB stacked bilayers were investigated by means of Monte Carlo technique based on Metropolis algorithm within Ising-like model. A higher values of blocking temperature for AB stacked bilayer was obtained, which indicates that AB nano-graphene bilayer is more energetically beneficial compared to AA stacked. Transition between ferromagnetic and paramagnetic phases of the considered types of bilayers, was established. This makes such nanosystems promising in sensor applications (magnetic field sensors) and spintronics. Hysteresis near absolute zero temperature for ferromagnetic case was obtained, the existence of which strongly depends on the values of exchange interaction and temperature. Obtained results of computer simulation agree with theoretical and experimental ones of other authors.
The magnetic properties of nano-graphene monolayer were investigated in the framework of Ising ferromagnetic model with mixed spins by means of Monte Carlo technique based on Metropolis algorithm. A transition between ferromagnetic and paramagnetic phases of the monolayer was established. This makes such type of nanosystem promising for spintronics and sensor applications (as magnetic field sensors). Near absolute zero temperature a magnetic hysteresis was obtained, that strongly depends on the values of the interaction constant and temperature. Obtained results agree with available theoretical and experimental works of other authors.
The optical properties of single-layer graphene-water complex with the help of powerful laser beam were investigated. According to the investigation an increase of light absorption by the sample was observed. Two possible causes of such anomalous absorption were considered: the doping process of single-layer graphene by the water molecules, and the scattering of optical radiation by microbubbles formed as a result of heating process of the monolayer. The obtained results demonstrated their simultaneous action.
Manuscript presents the results of study the anomalous light absorption by a system: graphene monolayer on the water surface. Properties of single-layer graphene-water complex were investigated with the help of powerful laser beam. According to the investigation, an increase in light absorption by the sample was observed. Two possible causes of such anomalous absorption were considered: the doping process of single-layer graphene by the water molecules, and the scattering of optical radiation by microbubbles formed as a result of heating process of the monolayer.
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