Distinctive features of variation in the thermal structure of impinging gas jets

Turbulent structures occurring in impinging air jets in both original and excited states are identified by means of processing the sequences of thermal images (thermal videofilms). It is assumed that the structure in a jet is a flow region in all whose points (elements) the temperature as a control parameter varies with time in accordance with a single dynamic law. An analysis of the obtained two-dimensional distributions of the characteristic frequencies of temperature fluctuations in impinging air jets makes it possible to reveal and to determine the generation and the localization of structure regions, the time intermittence effect, the difference in the nature of structure formations, and the structure formation effect on heat transfer.     

In situ investigation of ferromagnetism in magnetic nanolayers at room temperature

Ultrathin iron layers on different substrates and a Dy_{1 ? x} Ni _x /Nibilayer have been investigated in situ using the magneto-optical Kerr effect. Ferromagnetic ordering in the Dy_{1 ? x} Ni _x /Nistructure at room temperature has been established. A technique for estimating the thickness of the iron/silicon interface is proposed.     

Permalloy-copper-Permalloy sandwiches with perpendicular anisotropy axes in the magnetic layers

Layerd FeNi-Cu-FeNi structures with a mutually perpendicular orientation of the easy axes in the FeNi layers are fabricated in ultrahigh vacuum, and the physical properties of these structures are investigated: ferromagnetic resonance, quasistatic magnetization reversal, and the Faraday rotation of the plane of polarization of a light wave. Zh. Tekh. Fiz. 67, 45–48 (November 1997)