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  • 1
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    Spin-glass-like behavior and negative thermal expansion in antiperovskite Mn3Ni1−xCuxN compounds (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-06-06
    Description: The Cu-doping effect on the lattice and magnetic properties in Mn 3 Ni 1−x Cu x N (x = 0, 0.3, 0.5, 0.7, 1.0) was extensively investigated. We observed that the Cu-doping at the Ni site complicated the magnetic ground states, which induced the competition of antiferromagnetic and ferromagnetic interactions. Spin-glass-like behavior, arising from possible site-randomness and competing interactions of magnetism, was observed in compounds with x = 0.3, 0.5, and 0.7, and typically discussed by means of the measurement of ac magnetic susceptibility for x = 0.7. The negative thermal expansion (NTE) behavior, due to the magnetic ordering transition, was observed in Mn 3 Ni 1−x Cu x N compounds using variable temperature x-ray diffraction. It reveals that the introduction of Cu effectively broadens the temperature range displaying negative thermal expansion. The relationship between the local lattice distortion and the competing magnetic ground states might play an important role in broadening the NTE temperature range in this antiperovskite compound.
    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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    Mid-infrared emission and quantitative analysis of energy transfer processes in Er3+ doped oxyfluogermanate glasses (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-06-27
    Description: Oxyfluogermanate glasses with good thermal stability were prepared by melt-quenching method. The investigation of 2.7  μ m fluorescence spectra and energy transfer mechanism was performed pumped by an 808 nm laser diode. The 2.7  μ m radiative transition probability and emission cross section are 32.62 s −1 and 12.88 × 10 −21 cm 2 , respectively. The energy transfer parameters between 4 I 11/2 and 4 I 13/2 levels were calculated by Inokuti-Hirayama and Yokota-Tanimoto's model to further elucidate 2.7  μ m fluorescent behaviors. It is found that the energy transfer mechanism among Er 3+ is mainly dominated by dipole-dipole interactions. Results indicate that the prepared oxyfluogermanate glass is a promising candidate for mid-infrared laser applications.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Simulation on the translocation of homopolymers through sandwich-like compound channels (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-12-19
    Description: The forced translocation of homopolymers through αβα sandwich-like compound channels was investigated by Monte Carlo simulation. The interaction between polymer and part α is strongly attractive, whereas that between polymer and part β is purely repulsive. Simulation results show that the translocation is influenced obviously by the length of part β ( L β ) and the starting position of part β ( L α1 ). For small L β , the translocation is mainly governed by the escaping process, and polymer is trapped near the exit of the channel. However, the translocation time can be tuned by varying L α1 and the fastest translocation can be achieved at relatively large L α1 . Whereas for large L β and small L α1 , the translocation is mainly controlled by the filling process. It is difficult for polymer to enter the channel, and polymer is trapped at the first αβ interface. Finally, the dynamics for the filling process and the escaping process are discussed from the view of free-energy landscape, respectively.
    Electronic ISSN: 1931-9223
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Surface modification of multilayer graphene using Ga ion irradiation (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-04-24
    Description: The effect of Ga ion irradiation intensity on the surface of multilayer graphene was examined. Using Raman spectroscopy, we determined that the irradiation caused defects in the crystal structure of graphene. The density of defects increased with the increase in dwell times. Furthermore, the strain induced by the irradiation changed the crystallite size and the distance between defects. These defects had the effect of doping the multilayer graphene and increasing its work function. The increase in work function was determined using contact potential difference measurements. The surface morphology of the multilayer graphene changed following irradiation as determined by atomic force microscopy. Additionally, the adhesion between the atomic force microscopy tip and sample increased further indicating that the irradiation had caused surface modification, important for devices that incorporate graphene.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Simulation on the translocation of homopolymers through sandwich-like compound channels (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-12-19
    Description: The forced translocation of homopolymers through αβα sandwich-like compound channels was investigated by Monte Carlo simulation. The interaction between polymer and part α is strongly attractive, whereas that between polymer and part β is purely repulsive. Simulation results show that the translocation is influenced obviously by the length of part β ( L β ) and the starting position of part β ( L α1 ). For small L β , the translocation is mainly governed by the escaping process, and polymer is trapped near the exit of the channel. However, the translocation time can be tuned by varying L α1 and the fastest translocation can be achieved at relatively large L α1 . Whereas for large L β and small L α1 , the translocation is mainly controlled by the filling process. It is difficult for polymer to enter the channel, and polymer is trapped at the first αβ interface. Finally, the dynamics for the filling process and the escaping process are discussed from the view of free-energy landscape, respectively.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Quantitative measurements of shear displacement using atomic force microscopy (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-23
    Description: We report a method to quantitatively measure local shear deformation with high sensitivity using atomic force microscopy. The key point is to simultaneously detect both torsional and buckling motions of atomic force microscopy (AFM) cantilevers induced by the lateral piezoelectric response of the sample. This requires the quantitative calibration of torsional and buckling response of AFM. This method is validated by measuring the angular dependence of the in-plane piezoelectric response of a piece of piezoelectric α -quartz. The accurate determination of the amplitude and orientation of the in-plane piezoelectric response, without rotation, would greatly enhance the efficiency of lateral piezoelectric force microscopy.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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