A series of Pd1-xFex alloy epitaxial films (x = 0. 0.038. 0.062. and 0.080). a material promising for superconducting spintronics, was prepared and studied with ultrafast optical and magneto-optical ...laser spectroscopy in a wide temperature range of 4-300 K. It was found that the transition to the ferromagnetic state causes a qualitative change of both the reflectivity and the magneto-optical Kerr effect transients. A nanoscale magnetic inhomogeneity of the ferromagnet/paramagnet type inherent in the palladium-rich Pd1-xFex alloys reveals itself through the occurrence of a relatively slow. 10-25 ps. photoinduced demagnetization component following a subpicosecond one; the former vanishes at low temperatures only in the x = 0.080 sample. We argue that the 10 ps timescale demagnetization originates most probably from the diffusive transport of d electrons under the condition of nanoscale magnetic inhomogeneities. The low-temperature fraction of the residual paramagnetic phase can be deduced from the magnitude of the slow reflectivity relaxation component. It is estimated as ≈30% for x = 0.038 and ≈15% for x = 0.062 films. The minimal iron content ensuring the magnetic homogeneity of the ferromagnetic state in the Pd1-xFex alloy at low temperatures is about 7-8 atom %.
Interval processing of electrochemical data Kumkov, Sergey I.; Nikitin, Vyacheslav S.; Ostanina, Tatyana N. ...
Journal of computational and applied mathematics,
12/2020, Volume:
380
Journal Article
Peer reviewed
Problem of parameters estimation for an electrochemical process and constructing the calibration tube for real experimental data is considered. Probabilistic characteristics of the measuring errors ...are absent. Only interval bounds can be given on the measuring errors. The calibration tube is necessary for stopping the process. It is shown that usual standard (stochastic) methods of the mathematical statistics do not allow one to construct the desirable calibration tube of sufficient width. In contrast, the approach using the interval analysis methods allows one to analyze compatibility of the given sample of measurements, to construct the information set of compatible values of parameters, and to refine (to narrow) the calibration tube for stopping the experimental process with necessary accuracy in time. Results of successful application of the interval analysis procedures are illustrated on the example of processing real experimental data.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
A series of Pd
1−
x
Fe
x
alloy epitaxial films (
x
= 0, 0.038, 0.062, and 0.080), a material promising for superconducting spintronics, was prepared and studied with ultrafast optical and ...magneto-optical laser spectroscopy in a wide temperature range of 4–300 K. It was found that the transition to the ferromagnetic state causes a qualitative change of both the reflectivity and the magneto-optical Kerr effect transients. A nanoscale magnetic inhomogeneity of the ferromagnet/paramagnet type inherent in the palladium-rich Pd
1−
x
Fe
x
alloys reveals itself through the occurrence of a relatively slow, 10–25 ps, photoinduced demagnetization component following a subpicosecond one; the former vanishes at low temperatures only in the
x
= 0.080 sample. We argue that the 10 ps timescale demagnetization originates most probably from the diffusive transport of d electrons under the condition of nanoscale magnetic inhomogeneities. The low-temperature fraction of the residual paramagnetic phase can be deduced from the magnitude of the slow reflectivity relaxation component. It is estimated as ≈30% for
x
= 0.038 and ≈15% for
x
= 0.062 films. The minimal iron content ensuring the magnetic homogeneity of the ferromagnetic state in the Pd
1−
x
Fe
x
alloy at low temperatures is about 7–8 atom %.
Nowadays, 3D electrical wiring design automation is less covered by EDA&CAD systems, than its other aspects (solid modeling, simulation analysis, printed circuit boards development). This article ...offers an algorithm of electrical wiring design automation realization and an algorithm of computer aided development of design documentation package for electrical wiring aspect. The algorithms are based on EDA system Altium Designer and CAD system SolidWorks. As a case study, existing instrument manufacturing plant was taken.
Experimental and theoretical studies of the dynamic magnetization in swept
magnetic fields of the orthorhombic SrY$_2$O$_4$ single-crystals doped with the
Dy$^{3+}$ Kramers ions (0.01 and 0.5 at.%) ...with natural abundances of even and
odd Dy isotopes are presented. Impurity ions substitute for Y$^{3+}$ ions at
two nonequivalent crystallographic sites with the same local $C_s$ symmetry but
strongly different crystal fields. Well pronounced double-loop hysteresis is
observed at temperatures 2, 4, 5 and 6 K for sweeping rates of 5 and 1 mT/s.
The microscopic model of spectral, magnetic and kinetic properties of Dy$^{3+}$
ions is developed based on the results of EPR, site selective optical spectra
and magnetic relaxation measurements. The derived approach to the dynamic
magnetization in the sweeping field based on the numerical solution of
generalized master equations with time-dependent transition probabilities
induced by the electron-phonon interaction, quantum tunneling and
cross-relaxation allowed us to reproduce successfully the evolution of the
hysteresis loop shape with temperature, sweeping rate and concentration of
paramagnetic ions.
Electron paramagnetic resonance studies of the impurity Fe$^{3+}$ and
Mn$^{4+}$ centers indicate that the symmetry of the crystal structure of
millimeter-scale strontium titanate plates above 105 K ...lowers in the bulk from
cubic to tetragonal, different from that of the conventional low-temperature
antiferrodistortive phase. It is shown that the effect does not originate from
the residual stress; its magnitude (observed tetragonal distortion) and
particular manifestations depend on plate orientation, surface quality and the
geometry of a sample. Peculiarities of the observed phenomenon are presented
and possible scenario of its realization is discussed.
