Reactive sputtering of permalloy typically reduces crystallite size in films, if the concentration of reactive gas is low. This advances magnetic properties: decreases coercivity and increases good ...in-plane magnetic anisotropy. But oxygen is rarely applied for this purpose. Here, peculiar deposition conditions, including the geometry of the vacuum deposition system and large polymer substrate, allowed for the deposition of supermalloy with unusually high admixture of oxygen. Evolution of both static and dynamic magnetic properties with an increase in oxygen concentration proved to be dealt with the balance between grain size, surface structure, disordering of atomic structure and internal stresses. The critical concentration when supermalloy shows indications of oxidation is 5% of O2. Coercivity, resistivity, roughness and ferromagnetic resonance frequency are the parameters that are most sensitive to oxidation.
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•Oxygen admixture during sputtering decreases grain size in Ni78Fe18Mo4 films.•Oxidation starts at 5 vol% of O2 in a sputtering mixture Ar + O2.•Lower grain size decreases stresses and increases in-plane magnetic anisotropy.
The formation of ion fluxes of the laser plasma by axially symmetric magnetic fields is studied. An algorithm for forming ion fluxes is developed and a computer experiment is carried out. As a result ...of the computer and physical experiments, it is shown that ion packets with a duration exceeding several microseconds, which contain more than ~10
12
particles at a flight distance of about 2 m, can be obtained at the output of a laser-plasma ion source.
The paper is devoted to development of a portable vibrating unit and study of its applicability in generating seismic waves. The solution to developing a portable vibrating unit problem capable of ...generating a stable seismic signal in the target frequency range is very important. Existing solutions are cumbersome and cannot be widely applied in engineering seismic exploration. The paper describes in detail the design of the vibrator source, the stages of output laptop signals testing, the power amplifier, and haptic transducer control. Signals with different frequency sweeps were used during field acquisition. The recorded data were processed by multichannel analysis of surface waves. As a result of comparing the amplitude spectra and dispersion images of the surface wave, it was found that a hyperbolic (low-dwell) sweep signal generates a surface wave train in the entire frequency range (10–150 Hz), but does not produce high-frequency interference waves in cement concrete pavement as opposed to other sweep signals and sledgehammers. Based on the field data processing results, we reconstructed a one-dimensional shear-wave velocity model for soils and concluded on the success, practicability, and increased (compared to a sledgehammer) efficiency of using the developed vibrator source for acquisition and analysis of surface wave data for engineering seismology problems. The undoubted advantages of using a vibration source are controllability of the frequency content and its repeatability. The use of such vibroseis devices combined with stationary seismic recording systems is a promising direction for solving seismic monitoring problems.
The beginning of an experimental study of a high-current discharge in a vacuum with a duration of less than 100 ns initiated by laser plasma is reported. Measurements of the discharge current, ...neutron output, and ion fluxes by collector technique are given. When the discharge current reaches 40 kA, dips of up to 30% of its full amplitude are observed at the front of the current pulse.
The Beam Beam Counter is a system for local polarimetry and local luminosity monitoring at the Spin Physics Detector at NICA. The main option of the Beam Beam Counter is the scintillation counters ...with SiPM readout. The work presents the first results on scintillation detector prototype using developed Front-end electronics based on the Time-over-Threshold technique. The procedure of the time-walk correction is discussed.
The Beam–Beam Counter of the spin physics detector at NICA is proposed for local polarimetry and luminosity monitoring. The main option of the Beam-Beam Counter is the scintillation tiles with SiPM ...readout. In this paper, we present the results of studies of a scintillation detector prototype using two types of primary electronics. An estimation of the time resolution using the procedure for correcting the “time-walking” effect is discussed.
The paper presents the performance studies of the scintillation detector prototype with SiPM readout using different types of the front-end electronics. The timing and position resolutions with LED ...have been obtained. These results can be applied for the proton and deuteron beams polarimetry at the Internal Target Station at Nuclotron.
Negative anisotropy in Fe10Ni90 films Savin, P A; Adanakova, O A; Lepalovskij, V N ...
Journal of physics. Conference series,
11/2019, Letnik:
1389, Številka:
1
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
It is shown that in the Fe10Ni90 film the easy magnetization axis can be formed not along the deposition field, as it occurs in the Fe19Ni81 film, but across, that is a "negative anisotropy" effect ...occurs. A model that qualitatively describes this effect is proposed. Using the Kerr magnetometer, local measurements of the variation of the direction of the easy magnetization axis over the area of the film sample Fe10Ni90 were carried out and compared with the general view of the domain structure.
Dynamics of the electron beam for traveling wave S-band of the LUE-200 linac has been studied by numerical simulation to assess the impact of beam loading on beam characteristics such as capturing ...coefficient, mean energy, output spectrum, etc. Based on the results of simulations, recommendations to improve the beam parameters and decrease the effect of beam loading on the accelerating structure are proposed.
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