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  • 1
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    Shear strain induced modulation to the transport properties of graphene (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-08-27
    Description: Applying shear strain has been considered as a hopeful method to open a band gap of graphene. To study the transport properties of graphene under shear strain, a device was fabricated to apply shear strain, up to 16.7%, to graphene grown by chemical vapor deposition method. A top gate with ionic liquid as the dielectric material was used to tune the carrier density. The conductance of the Dirac point and carrier mobility is found to increase with a comparatively small increasing strain but then decrease with a larger one. Such a behavior might be related to several factors: the wrinkles, the transverse conducting channels, and the grain boundaries of graphene. Our study is helpful to further understand the strain engineering in graphene.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 2
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    Design of Thomson scattering diagnostic system on J-TEXT (2016)
    American Institute of Physics (AIP)
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    Publication Date: 2016-08-12
    Description: An infrared multi-channel Thomson scattering diagnostic system is designed from the viewpoint of development of the proposed system on the Joint Texas Experimental Tokamak (J-TEXT). A 3 J/50 Hz Nd:YAG laser, which is injected vertically into plasma in the direction from top to bottom, serves as the power source of the system. The scattering light is then collected horizontally and is transmitted to an interference-filter avalanche photodiode based polychromater for spectrum analysis. The system covers the half plasma cross section, providing 14 spatial points with 2 cm resolution. The proposed system can thus satisfy the requirements of the J-TEXT at present and in the near future. A detailed description of the system design is presented in this paper.
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Electronic properties of polycrystalline graphene under large local strain (2014)
    American Institute of Physics (AIP)
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    Publication Date: 2014-06-18
    Description: To explore the transport properties of polycrystalline graphene under large tensile strain, a strain device has been fabricated using piezocrystal to load local strain onto graphene, up to 22.5%. Ionic liquid gate whose capability of tuning carrier density being much higher than that of a solid gate is used to survey the transfer characteristics of the deformed graphene. The conductance of the Dirac point and field effect mobility of electrons and holes is found to decrease with increasing strain, which is attributed to the scattering of the graphene grain boundaries, the strain induced change of band structure, and defects. However, the transport gap is still not opened. Our study is helpful to evaluate the application of graphene in stretchable electronics.
    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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    Magnetic properties of Fe-Mn-Pt for heat assisted magnetic recording applications (2015)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2015-02-06
    Description: We calculate the electronic structures of FePt and Fe 0.5 Mn 0.5 Pt using first-principles calculations based on density functional theory within the local-spin-density approximation. The Curie temperature ( T c ) was calculated by mean field approximation. Composition dependence of the Cure temperature ( T c ( x )) of Fe 1− x Mn x Pt was used to identify a composition to meet the desired T c in the range of 600–650 K. The identified composition (0.0294 ≤  x  ≤ 0.0713) gives saturation magnetization ( M s ) in the range of 1041–919 emu/cm 3 and magnetocrystalline anisotropy constant ( K ) in the range of 9.96–8.36 × 10 6  J/m 3 at 0 K. Temperature dependent M ( T ) and K ( T ) of Fe 1− x Mn x Pt (0.0294 ≤  x ≤ 0.0713) were calculated using the Brillouin function and Callen-Callen experimental relation, respectively. Fe 1− x Mn x Pt (0.0294 ≤  x  ≤ 0.0713) shows 930–800 emu/cm 3 of M s and 7.18–5.61 × 10 6  J/m 3 of K at 300 K, thereby satisfying desired magnetic properties for heat-assisted magnetic recording media to achieve 4 Tb/in. 2 areal density.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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