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  • 1
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    Tunable exchange bias effect in magnetic Bi0.9Gd0.1Fe0.9Ti0.1O3 nanoparticles at temperatures up to 250 K (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-07-09
    Description: The exchange bias (EB) effect has been observed in magnetic Bi 0.9 Gd 0.1 Fe 0.9 Ti 0.1 O 3 nanoparticles. The influence of magnetic field cooling on the exchange bias effect has also been investigated. The magnitude of the exchange bias field ( H EB ) increases with the cooling magnetic field, showing that the strength of the exchange bias effect is tunable by the field cooling. The H EB values are also found to be dependent on the temperature. This magnetically tunable exchange bias obtained at temperatures up to 250 K in Bi 0.9 Gd 0.1 Fe 0.9 Ti 0.1 O 3 nanoparticles may be worthwhile for potential applications.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Twisted electron-acoustic waves in plasmas (2016)
    American Institute of Physics (AIP)
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    Publication Date: 2016-09-01
    Description: In the paraxial limit, a twisted electron-acoustic (EA) wave is studied in a collisionless unmagnetized plasma, whose constituents are the dynamical cold electrons and Boltzmannian hot electrons in the background of static positive ions. The analytical and numerical solutions of the plasma kinetic equation suggest that EA waves with finite amount of orbital angular momentum exhibit a twist in its behavior. The twisted wave particle resonance is also taken into consideration that has been appeared through the effective wave number q eff accounting for Laguerre-Gaussian mode profiles attributed to helical phase structures. Consequently, the dispersion relation and the damping rate of the EA waves are significantly modified with the twisted parameter η , and for η → ∞ , the results coincide with the straight propagating plane EA waves. Numerically, new features of twisted EA waves are identified by considering various regimes of wavelength and the results might be useful for transport and trapping of plasma particles in a two-electron component plasma.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Radiation stability of graphene under extreme conditions (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-10-01
    Description: In this letter, we report radiation stability of graphene under extreme condition of high energy density generated by 150 MeV Au ion irradiation. The experiment reveals that graphene is radiation resistant for irradiation at 10 14  ions/cm 2 of 150 MeV Au ions. It is significant to note that annealing effects are observed at lower fluences whereas defect production occurs at higher fluences but significant crystallinity is retained. Our results demonstrate applicability of graphene based devices in radiation environment and space applications.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Kinetic study of ion-acoustic plasma vortices (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-09-13
    Description: The kinetic theory of electron plasma waves with finite orbital angular momentum has recently been introduced by Mendonca. This model shows possibility of new kind of plasma waves and instabilities. We have extended the theory to ion-acoustic plasma vortices carrying orbital angular momentum. The dispersion equation is derived under paraxial approximation which exhibits a kind of linear vortices and their Landau damping. The numerical solutions are obtained and compared with analytical results which are in good agreement. The physical interpretation of the ion-acoustic plasma vortices and their Landau resonance conditions are given for typical case of Maxwellian plasmas.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Thermal spike effect in sputtering of porous germanium to form surface pattern by high energy heavy ions irradiation (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-05-17
    Description: Germanium exhibits a remarkable effect when subjected to high energy heavy ions irradiation. A synergic effect of high electronic energy loss (S e  = 16.4 keV nm −1 ) and nuclear energy loss (S n  = 0.1 keV nm −1 ) of 100 MeV Ag ions irradiation in Ge is presented. The results show that crystalline Ge is insensitive to the ionizing part of energy loss whereas thermal spike generated in the damaged Ge leads to the formation of porous structure. Further, an unusual high sputtering of the porous structure opens up the sub-surface voids to show the surface pattern. We explore the role of electron and phonon confinement to explain this effect.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Effect of annealing on the interfacial Dzyaloshinskii-Moriya interaction in Ta/CoFeB/MgO trilayers (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-09-28
    Description: The interfacial Dzyaloshinskii-Moriya interaction (DMI) has been shown to stabilize homochiral Néel-type domain walls in thin films with perpendicular magnetic anisotropy, and as a result, permit them to be propagated by a spin Hall torque. In this study, we demonstrate that in Ta/Co 20 Fe 60 B 20 /MgO, the DMI may be influenced by annealing. We find that the DMI peaks at D = 0.057 ± 0.003  mJ/m 2 at an annealing temperature of 230 °C. DMI fields were measured using a purely field-driven creep regime domain expansion technique. The DMI field and the anisotropy field follow a similar trend as a function of annealing temperature. We infer that the behavior of the DMI and the anisotropy are related to interfacial crystal ordering and B expulsion out of the CoFeB layer as the annealing temperature is increased.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 7
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    Composition-dependent bonding and hardness of γ-aluminum oxynitride: A first-principles investigation (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-06-12
    Description: Spinel phase aluminum oxynitride solid solution (γ-alon, with formula of Al (8+ x )/3 O 4− x N x ) exists in the narrow Al 2 O 3 -rich region of Al 2 O 3 -AlN systems. The first-principles calculations were developed to investigate the composition-dependent bonding and hardness of γ-alon. Six supercell model for Al (8+ x )/3 O 4− x N x ( x  = 0, 0.25, 0.44, 0.63, 0.81, and 1) was constructed to perform our calculations with high accuracy. It was found that the lattice constant increases with increasing composition of nitrogen in γ-alon. The bond lengths of Al IV –O, Al VI –O, Al IV –N, and Al VI –N all increase with the expansion of crystal structure. The well-known Mulliken overlap populations were calculated to estimate the bonding and hardness. As the content of nitrogen substitute increases, the Al–N bonds present more covalent characteristic, while the Al–O bonds present more ionic characteristic. The Al IV –N is the hardest bond in γ-alon. The theoretical hardness of γ-alon could be slightly enhanced from 17.16 GPa to 17.97 GPa by increasing content of nitrogen in full solubility range. The contribution ratio, C H μ , was proposed to quantify the contribution of bonds to hardness of γ-alon. The Al–O bonds are found to contribute more to the hardness. The Al–N bonds are the main influencing factor to enhance the hardness of γ-alon. These calculated results provide the basis for understanding the composition-dependent bonding and hardness of γ-alon.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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  • 8
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    Potential surface waves at the vacuum-radiative collisional plasma interface (2016)
    American Institute of Physics (AIP)
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    Publication Date: 2016-11-15
    Description: The stability of potential surface waves at the interface of collisional radiative electron-ion plasma and a vacuum is investigated. It is shown that the dynamics of electrons are affected by electromagnetic thermal radiation pressure significantly. The fluid model along with full set of Maxwell's equations is used to develop dispersion relation of electrostatic surface waves on hot homogeneous radiative collisional plasma. It is found that electrostatic surface waves become unstable in the presence of electromagnetic thermal radiation and self collision of plasma particles; however, thermal radiations stabilize the surface waves in the absence of collisions. The analytical results are verified numerically for both the laboratory and ionosphere plasma environment. The study of surface waves may seek its applications at the nano as well as the astroscales.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    Wake potential with exchange-correlation effects in semiconductor quantum plasmas (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-09-03
    Description: Using the non-relativistic quantum hydrodynamic model, wake potential has been studied in a magnetized semiconductor quantum plasma in the presence of upper hybrid wave which is excited via externally injected electron beam. The quantum effect contains electron exchange and correlation potential, Fermi degenerate pressure, and Bohm potential. It is found that the contribution of quantum mechanical electron exchange and correlation potential significantly modifies the amplitude and the effective length of the oscillatory wake potential. In the electron-hole plasma systems, electron exchange-correlation effects tend to increase the magnitude of the wake potential and are much effective at the distances of the order of Debye-length. The application of the work in context of the semiconductor plasmas have also been analyzed graphically.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
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  • 10
    Electronic Resource
    Electronic Resource
    Angle-energy distributions of Penning ions in crossed molecular beams. I. Evidence for discrete nonadiabaticity in the He*(2 1S)+H,D→He+H+,D++e− reaction (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2588-2599 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Relative doubly differential cross sections for the Penning ionization of H and D by He*(2 1S) are reported at a mean collision energy of 9.2 kcal/mol for H and 7.9 for D in an experiment employing crossed supersonic beams and a rotatable mass spectrometer detector. The products are scattered sharply forward in the center-of-mass frame, with release of an additional 3.5 kcal/mol into translational energy at the peak of the recoil distribution. The energy release is significantly lower than predicted on the basis of quantum dynamics on a single adiabatic ab initio complex potential, or of the experimental low-energy Penning electron spectrum (PIES). Discrete nonadiabatic behavior is suggested and a model is developed based on modifications of ab initio potentials, Penning ionization atom–atom theory on a single complex potential, and an adiabatic-velocity modification of Landau–Zener curve-crossing theory (which may be more generally useful). The dynamical model compares well with exact two-state complex potential calculations for the magnitude and energy dependence of the total ionization cross section, and improves the emulation of both the low-energy PIES data and our recoil distributions. Significant modifications to the ab initio potentials include a deepening of the well in the He*(2 1S)+H adiabatic potential by 2.0 to 10.2±1 kcal/mol, a quadrupling of the magnitude of the resonance width, and a reduction in the adiabatic splitting at the avoided crossing between 2 1S and 2 3P potentials. Our low-energy calculations suggest that available data on the associative ionization (HeH+) branching fraction is inconsistent with the PIES data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459835
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