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61.
H. Beyer M. Müller T. Schimmel 《Applied Physics A: Materials Science & Processing》1999,68(2):163-166
Received: 27 March 1998 相似文献
62.
F. Lelarge O. Dehaese E. Kapon C. Priester 《Applied Physics A: Materials Science & Processing》1999,69(3):347-351
Atomic force microscopy (AFM) in air is used to study the (110) cleaved surface of strained (100) InxGa1-xAs/ InP heterostructures for different compositions and thicknesses of the ternary compound layers. We find that the elastic
strain relaxation induces a surface undulation of a few ? amplitude, even for very small misfits, provided the layers are
thick enough. Using finite-element calculations of the strain relaxation near the cleaved edge, we reproduce quantitatively
the AFM observations for compressive- as well as for tensile-strained layers with an accuracy better than 0.1 nm. This demonstrates
the ability of AFM to quantify strain distributions by making use of surface profile measurements.
Received: 9 November 1998 / Accepted: 11 March 1999 / Published online: 7 July 1999 相似文献
63.
G. Rosenfeld K. Morgenstern M. Esser G. Comsa 《Applied Physics A: Materials Science & Processing》1999,69(5):489-496
Ultrathin metal films consisting of two-dimensional clusters are typically unstable: the cluster ensemble has the tendency
to reduce its total free energy via Ostwald ripening or dynamic coalescence of mobile clusters. In this paper we give an overview
of recent model experiments addressing these coarsening mechanisms. The experiments have been performed using STM on ensembles
consisting of adatom or vacancy clusters with typical diameters in the nanometer range on fcc(111)-metal surfaces. Agreement
with and deviations from conventional theories are discussed.
Received: 29 March 1999 / Accepted: 17 August 1999 / Published online: 30 September 1999 相似文献
64.
Qi-Ren Zhang 《Physica A》2009,388(19):4041-4044
We consider statistical irreversibility and its compatibility with reversible dynamics. The role played by the observation is analyzed in detail. It makes our previous proof for the second law of thermodynamics clearer. On this basis, we emphasize the importance and wide applicability of the second law of thermodynamics. A new form of physics with this law substituted by the principle of information conservation is suggested. By the way, we also solve the paradox of Schrödinger cat, and show that the universe will not go to the so-called heat death spontaneously. 相似文献
65.
Liyuan Liu Haofei Shi Xiangang Luo Xingzhan Wei Chunlei Du 《Applied Physics A: Materials Science & Processing》2009,95(2):563-566
Considering the fact that just the electrons confined in the region of the skin depth will actually affect the plasma frequency
due to the skin effect, a model for constructing epsilon-near-zero (ENZ) metamaterials through the arranged thin metallic
wires with arbitrary cross-section is developed, utilizing the perimeter approximation. With our model, plasma frequency can
be freely modulated just by the variance of the metallic wire perimeter, irrespective of the cross-section shape of wires.
The finite element method (FEM) and S-parameters retrieval method were employed to numerically simulate the plasma frequencies,
which have verified the validity of the theoretical model. 相似文献
66.
TiC/PVDF nanocomposite is prepared via simple blending and hot pressing route. Percolation theory was employed to explain the dielectric behavior of the TiC/PVDF composites. The dependence of the dielectric properties of the composite on both volume fraction of the filler and frequency is investigated. High dielectric constant (? = 540) and low loss (tan δ = 0.48) of the composites at 100 Hz have been observed near the percolation threshold (0.12). The composites show a weak frequency dependence towards the high frequency range (10–100 kHz), regardless of the TiC content. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
67.
68.
M.N. Popova 《Journal of magnetism and magnetic materials》2009,321(7):716-719
The family of RFe3(BO3)4 borates (R=Pr, Nd, Eu-Er, Y) was studied by high-resolution optical absorption and Raman spectroscopies. Structural and magnetic phase transitions were detected and the types of magnetic structure were determined. Energy of crystal-field (CF) levels and exchange splitting of the ground state of the R3+ ion were obtained from the analysis of optical spectra. CF calculations were carried out. Effective magnetic field at the R3+ site was found, using the calculated value of the magnetic g-factor. Some peculiarities of modeling the paramagnetic susceptibility of NdFe3(BO3)4 are discussed. 相似文献
69.
The interaction of stray fields and the eddy currents inherent in a sandwich domain structure is studied. This interaction allows us to control the existence of a sandwich domain structure in an amorphous ribbon. The formation of non-uniform magnetic anisotropy in an amorphous ribbon as a result of its annealing in a helical magnetic field is also investigated. 相似文献
70.
In this paper, the formulae of optical spectral levels and electron paramagnetic resonance (EPR) spectra in trigonal symmetry of 3d8 ions are established on the basis of strong field mechanism and a two spin-coupling (SO) parameters model. Unlike the classical crystal-field approach which has only taken the SO coupling of the central metal ions into account, the contribution of the SO coupling of the ligand ions to the optical and EPR spectra has been included in these formulae. When the optical and EPR spectra of the strong covalent crystals are calculated, the reasonable results can be obtained if the two SO parameters model has been put into action. As an application, the optical and EPR spectra of the (NiX6)4− clusters in CsMgX3:Ni2+ (X=Cl, Br, I) crystals have been studied by the complete diagonalization (of energy matrix) method (CDM). The calculated results agree well with experimental findings. From the investigations, a more valid method to calculate the optical and EPR spectra for 3d8 ions clusters is provided. 相似文献