Polotskiy D. Electronic, magnetic and optical properties and microstructure of TiN/Fe/C and AlN hybrid heterosystems

The paper describes a powerful device, unique in its technological capabilities — a hybrid helicon-arc ion-plasma reactor, the main feature of which is a combination of three plasma instruments within the technological volume. For the first time, a regular nanorelief structure with a size of 2–10 nm was obtained on a titanium nitride (TiN) film on single-crystalline silicon, on which magnetic monodomain nanoclusters of iron (Fe) were synthesized. For the first time, a superparamagnetic effect was detected in TiN/Fe nanostructures with a blocking temperature T = 42.2 K and a superparamagnetic limit temperature 150 K. It was found for the first time that nanostructured carbon synthesized on iron nanoclusters (TiN/Fe/C nanostructure) increases magnetic susceptibility value several times compared to the carbon-free sample (TiN/Fe nanostructure), significantly increases the superparamagnetic blocking temperature to 180 K for H = 100 E and up to 90–120 K for H = 1 kE and raises the temperature of the superparamagnetic boundary to room temperature. It was found for the first time that at room temperatures I–V characteristics of TiN/Fe/C heterostructures show the occurrence of states with zero differential resistance and giant conductivity that may be due to resonant-percolation transport in nanostructured C. For the first time, the switching effects of the memristor type in TiN/Fe/C heterostructures between high-impedance and low-impedance states were revealed. Nanostructured AlN films were firstly synthesized on flexible thermolabile polymer substrates Teflon and Mylar. It is established that the surface of the obtained AlN films is characterized by the presence of two reliefs: micro-relief and nanorelief. The reliefs structure depends on the operating parameters — pressure and application time. In nanostructured AlN films synthesized on polymeric substrates made of Teflon and Mylar, for the first time, the band of residual rays ( 10–20 μm) has been detected leading to effective blocking of the IR radiation. The obtained fundamental scientific results are of great practical importance: Based on the helicon-arc sources of high-density plasma flows, physical principles of the ion-plasma condensate formation for the creation of functional hybrid heterosystems TiN/Fe, TiN/Fe/C and AlN have been developed. Results of the study of magnetic and relaxation phenomena in nanostructured TiN/Fe heterostructures indicate possibility of essential growth in the magnetic recording density due to significant increase in the iron anisotropy coefficient in the nanostructured state. Synthesis of nanostructured iron on the surface of carbon nanostructures (TiN/Fe/C) allows us to approach the solution of the problem of overcoming the superparamagnetic limit. The revealed asymmetric hysteresis behavior of the I–V characteristics of TiN/Fe/C heterostructures allows implementation of novel devices for data recording — memristors on their base. Fabricated multispectral IR filters based on AlN ion-plasma condensates on flexible polymer substrates made of Mylar and Teflon are necessary for supersensitive cryogenic receiving systems of the newest systems for information transfer, telecommunications, new generation of navigation and positioning systems.