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Journal of Applied Physics Collection (168 Books)


 
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Journal of Applied Physics : Electric-field induced modification o...

By: Y. C. Huang, C. P. Chang, and M. F. Lin

Description: In the presence of electric fields, the low-energy electronic properties of AB-stacked few-layer graphene nanoribbons are studied by using the tight-binding model. They are strongly dependent on the geometric structures (the interlayer interactions, the ribbon edges, the ribbon width Ny, and the ribbon number Nz) and the field strength. The interlayer interactions significantly affect density of states (DOS), energy gap (Eg), band structure, and free carrier...

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Journal of Applied Physics : Characterization of dilute InPN layer...

By: T. D. Das, S. Dhar, and B. M. Arora

Description: We have grown dilute InPN layers by liquid phase epitaxy and characterized them using high resolution x-ray diffraction, optical absorption, low temperature photoluminescence, and Hall measurement techniques. Our results indicate that a maximum amount of 0.2% nitrogen has been incorporated in the material with a band gap lowering consistent with expectations. The crystalline quality of the material is found to improve upon nitrogen incorporation. Large incre...

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Journal of Applied Physics : Correlation of local structure and el...

By: Damiano Giubertoni, Giancarlo Pepponi, Salvatore Gennaro, Massimo Bersani, Mehmet Alper Sahiner et al

Description: The understanding of the behavior of arsenic in highly doped near surface silicon layers is of crucial importance for the formation of N-type ultrashallow junctions in current and future very large scale integrated technology. This is of particular relevance when studying recently developed implantation and annealing methods. Past theoretical as well as experimental investigations have suggested that the increase in As concentration, and therefore the recipr...

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Journal of Applied Physics : Strain relaxation in InAs self-assemb...

By: J. F. Chen, C. H. Yang, Y. H. Wu, L. Chang, and J. Y. Chi

Description: The effect of a high N incorporation in self-assembled InAs quantum dots (QDs) is investigated by analyzing the electronic and structural properties around QD region. Capacitance-voltage profiling and admittance spectroscopy shows that N incorporation into the InAs QD layer leads to drastic carrier depletion in the QD layer and neighboring GaAs layers due to the formation of a deep defect state at 0.34–0.41 eV. The signature of this defect state is similar t...

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Journal of Applied Physics : The influence of interfaces on the di...

By: R. Moucka, J. Vilcáková, N. E. Kazantseva, A. V. Lopatin, and P. Sáha

Description: In the present paper we report on the specific features of the dielectric properties of a MnZn ferrite/Al based composite. Previously, it has been shown that high-frequency magnetic losses in such hybrid composites (HCs) can be enhanced due to the formation of a core-shell-like structure of a composite, in which ferrite particles are immersed into a conducting medium formed by a continuous network of conducting particles that spans throughout the polymer mat...

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Journal of Applied Physics : Gallium oxide and gadolinium gallium ...

By: G. W. Paterson, P. Longo, J. A. Wilson, A. J. Craven, A. R. Long et al

Description: Test devices have been fabricated on two specially grown GaAs/AlGaAs wafers with 10 nm thick gate dielectrics composed of either Ga2O3 or a stack of Ga2O3 and Gd0.25Ga0.15O0.6. The wafers have two GaAs transport channels either side of an AlGaAs barrier containing a Si δ-doping layer. Temperature dependent capacitance-voltage (C-V) and current-voltage (I-V) studies have been performed at temperatures between 10 and 300 K. Bias cooling experiments reveal the ...

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Journal of Applied Physics : Electrical transport and thermoelectr...

By: D. Li, K. Yang, H. H. Hng, X. Y. Qin, and J. Ma

Description: The electrical transport and thermoelectric properties of CoSb3 and double filled compounds Ca0.1CexCo4Sb12 (x = 0.05, 0.1, and 0.15) were investigated in the temperature range from 5 to 300 K. The results indicated that double filling of Ca and Ce has a strong influence on the temperature dependence of the electrical resistivity. For samples CoSb3 and Ca0.1Ce0.05Co4Sb12, the relationship of ln ρ∝1/T existed only in the temperature regimes of 100–200 and 160...

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Journal of Applied Physics : Microstructures and the corresponding...

By: V. G. Prokhorov, Y. H. Hyun, J. S. Park, J. B. Kim, G. H. Kim et al

Description: The microstructural and magnetic properties of amorphous, nanoclustered, and self-organized bilayer Nd0.5Sr0.5MnO3 films, prepared by rf magnetron sputtering, are investigated. The amorphous film was found to be a typical paramagnet with free motion of the individual Mn spins, and the magnetic properties are well described on the basis of the Curie–Weiss approximation. The nanoclustered film manifests magnetic properties mimicking those of superparamagnetic ...

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Journal of Applied Physics : Fluctuation-induced conductivity of p...

By: Najmul Hassan and Nawazish A. Khan

Description: The fluctuation-induced conductivity of Ni free and Ni doped Cu0.5Tl0.5Ba2Ca2Cu3−yNiyO10−δ (y = 0, 0.5, 1.0, 1.5) samples is investigated for comparison of dimensionality of fluctuations above the mean-field critical temperature. The temperature dependence of paraconductivity can be described by a power law following Aslamazov–Larkin (AL) type equations for these polycrystalline superconductors. It is observed from these studies that at higher temperatures, ...

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Journal of Applied Physics : Particle size effect on strength, fai...

By: E. B. Herbold, V. F. Nesterenko, D. J. Benson, J. Cai, K. S. Vecchio et al

Description: The variation of metallic particle size and sample porosity significantly alters the dynamic mechanical properties of high density granular composite materials processed using a cold isostatically pressed mixture of polytetrafluoroethylene (PTFE), aluminum (Al), and tungsten (W) powders. Quasistatic and dynamic experiments are performed with identical constituent mass fractions with variations in the size of the W particles and pressing conditions. The relat...

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Journal of Applied Physics : Magnetic levitation in two-dimensiona...

By: C. Lorin and A. Mailfert

Description: The development of activities in space and of the corresponding technologies requires research on the behavior of both matter and biological organisms under weightless conditions. Various methods have been invented in order to simulate weightlessness, for example, drop towers, sounding rockets, or parabolic flights. Magnetic field ground-based devices have also been developed. This paper introduces an optimization method of the magnetic field so as to obtain...

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Journal of Applied Physics : CoCrPt-oxide based perpendicular reco...

By: S. N. Piramanayagam, K. Srinivasan, R. Sbiaa, Yan Dong, and R. H. Victora

Description: Writability of magnetic recording media with high anisotropy constant (Ku) is one of the major challenges encountered in extremely high density recording. A possible avenue to improve writability in perpendicular magnetic recording is to reduce the spacing between the writing head and the soft magnetic underlayer (SUL) or head-to-keeper spacing (HKS). A hybrid layer structure for reducing the HKS between the SUL and the writing head is investigated. The prop...

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Journal of Applied Physics : Crystal structure effect on the ferro...

By: Bo Gu, Nejat Bulut, and Sadamichi Maekawa

Description: We study the ferromagnetism in the compound (Zn,Mn)O within the Haldane–Anderson impurity model by using the quantum Monte Carlo technique and the tight-binding approximation for determining the host band structure and the impurity-host hybridization. This computational approach allows us to determine how the host crystal structure influences the impurity bound state, which plays an important role in the development of the ferromagnetic (FM) correlations bet...

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Journal of Applied Physics : Enhanced grain surface effect on magn...

By: P. Dey, T. K. Nath, P. K. Manna, and S. M. Yusuf

Description: We have investigated the effect of nanometric grain size on magnetic properties of La0.7Ca0.3MnO3 nanoparticles having average particle size (Φ) of ∼ 17 nm. Temperature dependence of field-cooled (FC) and zero-FC (ZFC) dc magnetization indicate the existence of two different types of relaxation processes: a relatively high temperature regime where there is a broad maximum of the ZFC curve at T = Tmax (>40 K) and another is a relatively low temperature regime...

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Journal of Applied Physics : Effect of grain refinement on enhanci...

By: A. Malagoli, V. Braccini, M. Tropeano, M. Vignolo, C. Bernini et al

Description: Ex situ powder-in-tube MgB2 tapes prepared with ball-milled, undoped powders showed a strong enhancement of the irreversibility field H∗, the upper critical field Hc2, and the critical current density Jc(H) together with the suppression of the anisotropy of all of these quantities. Jc reached 104 A/cm2 at 4.2 K and 10 T, with an irreversibility field of about 14 T at 4.2 K, and Hc2 of 9 T at 25 K, high values for not-doped MgB2. The enhanced Jc and H∗ values...

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Journal of Applied Physics : Tuning of magnetism in SrRuO3 thin fi...

By: B. W. Lee, C. U. Jung, M. Kawasaki, and Y. Tokura

Description: Control of the magnetic easy axis in SrRuO3 thin films is important for tunnel junction studies incorporating this layer and for wider device applications. Previously, we demonstrated control of the magnetic easy axis in SrRuO3 thin films on SrTiO3 (110) substrates by introducing tunable anisotropic strain through a CaHfO3 buffer layer. However, our method was not directly applicable due to the existence of twins in the CaHfO3 layer that grew on the SrTiO3 (...

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Journal of Applied Physics : Phase transformation sequence and mag...

By: X. Y. Xiong and T. R. Finlayson

Description: The phase transformation sequence, microstructure and compositions, and magnetic properties for a melt-spun Sm(Co0.68Fe0.2Cu0.1Zr0.02)7.5 alloy after isochronal heat treatments have been studied by using x-ray diffraction, transmission electron microscopy, three-dimensional atom probe (3DAP), and magnetometry. The as-spun ribbons had a single phase with the Cu7Tb structure. After being aged at 720 °C, the single phase decomposed into two major phases: 2:17R ...

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Journal of Applied Physics : Magnetic structures and phase transit...

By: J. L. Wang, S. J. Campbell, A. J. Studer, M. Avdeev, M. Hofmann et al

Description: The magnetic properties and magnetic structures of PrMn2−xFexGe2 compounds (space group I4/mmm) have been investigated using magnetic, 57Fe Mössbauer effect (x = 1.0,1.3,1.6), and neutron diffraction measurements (x = 0.4,0.6,0.8,1.3) over the temperature range of 3–410 K. This has enabled the existing magnetic phase diagram for PrMn2−xFexGe2 to be extended from Fe concentration x = 0–1 to the full range x = 0–2 in terms of concentration and dMn–Mn, the intr...

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Journal of Applied Physics : Magnetic ordering anisotropy in epita...

By: C. C. Hsieh, T. H. Lin, H. C. Shih, C.-H. Hsu, C. W. Luo et al

Description: Orthorhombic YMnO3 thin films with (200), (020), and (001) orientations were, respectively, obtained by pulsed laser deposition on SrTiO3(110), LaAlO3(110), and SrTiO3(001) substrates. The results demonstrate that the strain between film and substrate can serve as an alternative in transforming the thermodynamically stable hexagonal YMnO3 into the orthorhombic phase, which previously could be obtained with high-pressure high temperature syntheses and epitaxy...

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Journal of Applied Physics : Fabrication of YBa2Cu3O7 thin film on...

By: Makoto Tokudome, Toshiya Doi, Ryota Tomiyasu, Shinya Sato, Yoshinori Hakuraku et al

Description: We achieved a biaxially oriented YBa2Cu3O7 film on a {100} 〈001〉 textured Cu tape with Jc of 1.9×106 A cm−2 at 77 K. A Ni overlayer was deposited by electroplating technique on the {100} 〈001〉 textured Cu tape to improve oxidation resistance of Cu substrate, and then YBa2Cu3O7 was deposited on the CeO2/YSZ/CeO2 buffered Ni-electroplated Cu tape. We confirmed that the Ni-electroplated Cu tape lost its ferromagnetism after 700 °C at 1 h heat treatment. Our rol...

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