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  • 1
    Electronic Resource
    Electronic Resource
    Mobility of domain walls in low-loss garnet films (1997)
    Springer
    Physics of the solid state 39 (1997), S. 1112-1115 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dependence of the domain wall mobility on the strength of a static magnetic field applied in the plane of the sample is investigated in single-crystal garnet films of the system YBiFeGa with perpendicular magnetic anisotropy and a narrow ferromagnetic resonance line. It is shown that, as in the case of YIG single crystals with cubic magnetic anisotropy, wall motion gives rise to an additional energy loss contribution far greater than the relativistic contribution also present in the case of homogeneous magnetization. It is established that a mechanism recently proposed in theory does not give a correct explanation for this additional contribution, because qualitative as well as quantitative discrepancies exist between the theoretical conclusions and measurement data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130026
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  • 2
    Electronic Resource
    Electronic Resource
    The initial stage in the nonlinear motion of a domain wall in garnet films (2000)
    Springer
    Physics of the solid state 42 (2000), S. 2250-2253 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of the domain-wall motion in single-crystal garnet films of the YBiFeGa system with a perpendicular magnetic anisotropy, activated by a constant in-plane bias field H p parallel to the wall plane and a pulsed drive field H g of an amplitude corresponding to the nonlinear region of the domain-wall velocity vs. the H g relation is reported. The earlier data suggesting the existence of an initial phase of motion, where the wall is accelerated to a high instantaneous velocity, have been confirmed. The wall behavior in the initial phase has been shown to be affected by the field H p and the drive-field pulse rise time. A possible mechanism of the wall structure transformation after the application of the H g pulse is considered. It has been established that the dependence of the wall velocity on H p in the saturation region disagrees with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1332147
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  • 3
    Electronic Resource
    Electronic Resource
    Dependence of the domain-wall velocity on the driving field in garnet films (1997)
    Springer
    Physics of the solid state 39 (1997), S. 577-579 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dependence of the domain-wall velocity on the amplitude of the driving magnetic field pulses is investigated in an iron garnet film of the (YSmCa)3(FeGe)5O12 system with a (111) orientation. The results obtained are analyzed from the standpoint of existing theory. A maximum corresponding to the disruption of steady-state motion is observed on the dependence. Thereafter, the velocity at first decreases sharply and then increases. It is theorized that a process involving the periodic generation, propagation, and annihilation of horizontal Bloch lines occurs in the wall in this period. Data are obtained for the velocity saturation region, which confirm a previously proposed empirical formula and a theoretical model, according to which the saturation regime corresponds to a state of chaos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1129933
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  • 4
    Electronic Resource
    Electronic Resource
    Relation between relaxation losses in domain-wall motion and ferromagnetic resonance in garnet films (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1377-1382 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Domain-wall mobility has been studied in garnet films having perpendicular magnetic anisotropy and a narrow FMR line. An analysis of the obtained and published experimental data shows that for the value of the Landau-Lifshits reduced damping parameter derived from FMR measurements, ΛFMR〉2.4×10−9 Oe2·s, the domain-wall mobility is inversely proportional to ΛFMR, which is in agreement with classical theory. For ΛFMR〈2.43×10−9 Oe2·s, the mobility decreases with decreasing ΛFMR. Possible reasons for this behavior are discussed. An empirical expression relating the losses entailed in domain motion to FMR-related losses for small ΛFMR is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130563
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  • 5
    Electronic Resource
    Electronic Resource
    Photorefractive effect in sillenite crystals with shallow traps in a sign-alternating electric field (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1844-1849 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of a theoretical analysis of the photorefractive response in crystals with shallow traps to in a sign-alternating, square-wave electric field are presented. The numerical analysis method developed imposes no restrictions on the frequency of the external field and the period of the photorefractive grating. The parameters characterizing deep donor and shallow trap centers are estimated on the basis of investigations of two-beam interaction in a Bi12SiO20:Cd crystal with the application of a sign-alternating, square-wave electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130669
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic structure and microstructure of die-upset hard magnets RE13.75Fe80.25B6 (RE=Nd, Pr): A possible origin of high coercivity (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3254-3263 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In situ transmission electron microscopy magnetizing experiments combined with Lorentz magnetic microscopy in Fresnel–Foucault modes were used to characterize the magnetic structure of die-upset, high energy-product hard magnets Nd13.75Fe80.25B6 and Pr13.75Fe80.25B6. Experimental observations indicate a well-aligned grain structure and quasiperiodic nonaligned "extended defect" layers transverse to press direction. The local remanence of the "defect" layers is far from saturation when the external field is removed. The layers are enriched with inclusions of approximate composition Nd7Fe3, generally with a polygonal shape, and are associated with the original ribbon interfaces. They may be responsible for a high coercivity mechanism, since the motion of reverse domains can be impeded by these layers, even when they are nucleated. Thus, a delayed nucleation of reversed domains seems to be a limiting factor for magnetization reversal and coercivity force. Both Lorentz magnetic imaging and high-resolution microscopy highlight the role of magnetocrystalline anisotropy for domain wall-grain boundary interactions and pinning. Local remanence was estimated directly from magnetic moment sensitive Foucault images. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369668
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  • 7
    Electronic Resource
    Electronic Resource
    Shape Determination from Solution Scattering of Biopolymers (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 798-802 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Practical aspects of low-resolution shape determination in small-angle scattering studies of biological macromolecules in solution are considered. The shape restoration method using spherical harmonics [Svergun, Volkov, Kozin & Stuhrmann (1996). Acta Cryst. A52, 419–426] is extended to account for deviations from the idealized model and to work directly on raw experimental data sets. An algorithm to restore the structure of homodimeric particles in terms of the shape of the monomer and the separation between the monomers is implemented. Applications of the program to the shape restoration of several proteins, with known and unknown crystal structures, from X-ray solution-scattering data are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897001714
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  • 8
    Electronic Resource
    Electronic Resource
    ASSA, a Program for Three-Dimensional Rendering in Solution Scattering from Biopolymers (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 811-815 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A program for three-dimensional rendering and interactive model refinement, ASSA, is presented. The program permits the simultaneous display and manipulation of low-resolution envelope models obtained from solution-scattering data and the crystallographic or electron microscopic models in the Brookhaven Protein Data Bank format. ASSA is coupled with the shape-determination program of Svergun, Volkov, Kozin, Stuhrmann, Barberato & Koch [J. Appl. Cryst. (1997). 30, 000–000], thus allowing one to monitor the shape determination process in real time. The program ASSA is written in C using the PHIGS+ standard for the three-dimensional solid rendering and the XView and XLib libraries for the menu-driven user interface. The system runs on a Sun SPARC ZX-20 workstation; a simplified IBM-PC version is also available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897001830
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  • 9
    Electronic Resource
    Electronic Resource
    Structural studies of the 30S subunit of ribosomes Thermus thermophilus by small-angle neutron and X-ray scattering (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 515-518 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Three different small-angle neutron scattering facilities, the "YUMO" camera at JINR (Dubna, Russia), the V4 camera at HMI (Berlin, Germany) and D11 camera at ILL (Grenoble, France), were used in the investigation of 30S ribosomal subunit from Thermus thermophilus. Parallel X-ray measurements on X33 camera at DESY (Hamburg, Germany) were used to control the identity of deuterated particles. The neutron and x-ray contrast variation data were interpreted by direct method using spherical harmonics. Structural models of the 30S ribosomal subunit from Thermus thermophilus and its RNA -rich core with the resolution 3.5 nm were constructed. A comparison between the 30S Thermus thermophilus and 30S E.coli models shows that primary difference between them consists in the special distributions of the protein component whereas the special distributions of the RNA component coincide well in both models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889800098009
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  • 10
    Electronic Resource
    Electronic Resource
    Action of laser radiation on peroxide chemiluminescence of wound exudate (1986)
    Springer
    Bulletin of experimental biology and medicine 102 (1986), S. 1369-1372 
    Details
    ISSN: 1573-8221
    Keywords: laser radiation ; chemiluminescence ; wound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00851050
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