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Influence of External Magnetic Field on Anomalous Skin Effects in Inductively Coupled Plasmas

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Chinese Physics Letters 2004年第3期21卷 511-513页

作者：毛明王友年 TheStateKeyLaboratoryofMaterialsModification DepartmentofPhysicsDalianUniversityofTechnologyDalian116024

Using a one-dimensional slab model, we study the influence of the external static magnetic field on the anomalous skin effects in the inductively coupled plasma. The rf electromagnetic field in the plasma is determined by solving the linearized Boltzmann equation incorporating the Maxwell equations. The numerical results show that, due to the existence of the external magnetic field, the anomalous skin effects are greatly enhanced and the number of regions with negative absorption is decreased.

关键词： condensed matter: electrical magnetic and optical Plasma physics

Full Aging in Spin Glass State of Y0.90Na0.10MnO3

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Chinese Physics Letters 2004年第10期21卷 2045-2048页

作者：陈卫然张福昌苗君许波董晓丽曹立新邱祥冈赵柏儒 NationalLaboratoryforSuperconductivity InstituteofPhysicsChineseAcademyofSciencesPOBox603Beijing100080

We study the decays of the thermoremanent magnetization in Y0.90Na0.10MnO3 for different waiting times at the measuring temperature 33K, well below the spin glass (SG) transition temperature 42K. The results demonstrate that almost perfect full aging can appear even in the case of the cooling time as long as 700s from 60K to 33K. By subtracting the stationary component A(τ0t)a (A is a dimensionless constant, t represents the time, τ0 is the microscopic spin flipping time, and α is a parameter always in the rang of 0.1-0.01), the value of α is found to be much smaller than that reported in other SG systems, which is well consistent with the behaviour of the ac susceptibility. All of them are discussed based on the intrinsic geometric magnetic frustration for the present system.

关键词： condensed matter: electrical magnetic and optical condensed matter: structural mechanical & thermal

Optical Interference Effects by Metal Cathode in Organic Light-Emitting Diodes

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Chinese Physics Letters 2004年第7期21卷 1370-1373页

作者： WUZhao-Xin WANGLi-Duo QIUYong KeyLabofOrganicOptoelectronics&MolecularEngineering DepartmentofChemistryTsinghuaUniversityBeijing100084

The dependence of light intensities of organic light-emitting diodes (OLEDs) on the distance of emission zone to metal cathode is investigated numerically. The investigation is based on the half-space optical model that accounts for optical interference effects of metal cathode. We find that light intensities of OLEDs are functions of the distance of emission zone from the metal cathode because of the effect of interference of the metal cathode. This interference leads to an optimal location of emission zone in OLEDs for the maximum of light intensities. Optimal locations of emission zone are numerically shown in various emitting colour OLEDs with different metal cathodes and these results are expected to give insight into the preparation of high efficiency full colour or white light OLEDs.

关键词： condensed matter: electrical magnetic and optical Electronics and devices Optics quantum optics and lasers

Blue Luminescence of CdS Nanowires Synthesized by Sulfurization

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Chinese Physics Letters 2004年第5期21卷 959-962页

作者：郜涛孟国文王太宏 InstituteofSolidStatePhysics ChineseAcademyofSciencesHefei230031 InstituteofPhysics ChineseAcademyofSciencesBeijing100080

Polycrystalline CdS nanowires have been synthesized by sulfurizing metal Cd nanowires deposited electrochemically within the nanochannels of porous anodic alumina (PAA) templates. Photoluminescence (PL) investigation shows that the CdS nanowires have an intensive and broad PL emission band peaked around 435 nm. The investigation results suggest that localized defects and excess S atoms existing in the CdS nanowires are responsible for this blue luminescence.

关键词： condensed matter: electrical magnetic and optical Semiconductors

Metamorphic InGaAs p-i-n Photodetectors with 1.75 μm Cut-Off Wavelength Grown on GaAs

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Chinese Physics Letters 2010年第3期27卷 324-327页

作者：朱彬韩勤杨晓红倪海桥贺继方牛智川王欣王秀平王杰 State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 State Key Laboratory for Superlattices and microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

Top-illuminated metamorphic InGaAs p-i-n photodetectors （PDs） with 50% cut-off wavelength of 1.75 μm at room temperature are fabricated on GaAs substrates. The PDs are grown by a solid-source molecular beam epitaxy system. The large lattice mismatch strain is accommodated by growth of a linearly graded buffer layer to create a high quality virtual InP substrate indium content in the metamorphic buffer layer linearly changes from 2% to 60%. The dark current densities are typically 5 × 10^-6 A/cm^2 at 0 V bias and 2.24 × 10^-4 A/cm^2 at a reverse bias of 5 V. At a wavelength of 1.55 μm, the PDs have an optical responsivity of 0.48 A/W, a linear photoresponse up to 5 mW optical power at -4 V bias. The measured -3 dB bandwidth of a 32 μm diameter device is 7 GHz. This work proves that InGaAs buffer layers grown by solid source MBE are promising candidates for GaAs-based long wavelength devices.

关键词： condensed matter: electrical magnetic and optical Electronics and devices Surfaces interfaces and thin films Optics quantum optics and lasers

Raman Spectrum of Epitaxial Graphene on SiC （0001） by Pulsed Electron Irradiation

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Chinese Physics Letters 2010年第4期27卷 196-199页

作者：黄青松郭丽伟王文军王刚王皖燕贾玉萍林菁菁李康陈小龙 Beijing National Laboratory for condensed matter Physics Institute of Physics Chinese Academy of Sciences PO Box 603 Beijing 100190

We report new Raman features of epitaxial graphene （EG） on Si-face 4H-SiC prepared by pulsed electron irradiation （PEI）. With increasing graphene layers, frequencies of G and 2D peaks show blue-shifts and approach those of bulk highly-oriented pyrolytic graphite. It is indicated that the EG is slightly tension strained and tends to be strain-free. Meanwhile, single Lorentzian line shapes are well fitted to the 2D peaks of EG on SiC（O001） and their full widths at half maximum decrease with the increasing graphene layers, which indicates that the multilayer EG on Si-face can also contain turbostratic stacking by our PEI route instead of only AB Bernal stacking by a traditional thermal annealing method. It is worth noting that the stacking style plays an important role on the charge carrier mobility. Therefore our findings will be a candidate for growing quality graphene with high carrier mobility both on the Si- and C-terminated SiC substrate. Mechanisms behind the features are studied and discussed.

关键词： condensed matter: electrical magnetic and optical Semiconductors condensed matter: structural mechanical & thermal Nanoscale science and low-D systems

Numerical Calculation of Kerr Spectra for Magnetic Granular Films

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Chinese Physics Letters 2004年第2期21卷 389-392页

作者：林应斌黄志高都有为 DepartmentofPhysics FhjianNormalUniversityFhzhou350007 NationalLaboratoryofSolidStateMicrostructures NanjingUniversityNanjing210093

Based on the 4 * 4 matrix method, we present theoretical calculations of the magneto-optic polar Kerr effect with the incident energy in granular films. It is found that the simulated results are in good agreement with experimental ones. In addition, Kerr rotation and ellipticity as functions of incident angle and magnetic film thickness have been computed. The calculated results indicate that the Kerr spectra as a function of the incident angle reveal a maximum at certain incident angles and the Kerr spectra appear to be periodical and have damped oscillation as a function of the magnetic film thickness, which is important for the design of the materials in the future.

关键词： condensed matter: electrical magnetic and optical Surfaces interfaces and thin films

Unified Understanding of Giant Magnetoresistance Effect and Magnetization in Granular Films with Two-Particle Size Distribution

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Chinese Physics Letters 2004年第11期21卷 2255-2258页

作者： Jian-QingWANG JordanPeck FinnobarrO'Grady NamKim DepartmentofPhysics StateUniversityofNewYorkBinghamtonNY13902USA

The giant magnetoresistance (GMR) effect and magnetization curves of Cu80Co20 granular thin films are studied and measured in a superparamagnetism temperature (180K). The correlation between the GMR effect and the magnetization is analysed in a unified framework. These two independent properties are fitted by assuming that there are two size distributions in the Co nano-particle population. Under an assumption, good fittings are achieved for both the GMR and the magnetization, using the minimal number of parameters. The obtained average particle sizes for the smaller and larger particles are 1.0 nm and 2.8 nm, respectively. In fitting the magneto-transport, a power scaling relationship with the particle size for each size population is proposed, and the fitted results reveal that a certain degree of magnetic bulk scattering is present in larger particles.

关键词： condensed matter: electrical magnetic and optical Surfaces interfaces and thin films Nanoscale science and low-D systems

Exchange Bias in NiCo/FeMn Bilayers with Stripe Domains

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Chinese Physics Letters 2009年第10期26卷 167-169页

作者：林静时钟周仕明张霞夏云杰 Surface Physics Laboratory and Department of Physics Fudan University Shanghai 200433 Shandong Province Key Lab Laser Polarization and Information Qufu Normal University Qufu 273165

Exchange bias in NiCo/FeMn bilayers is established by alternating current （magnetic） field cooling, and stripe domains are induced as manifested by the ＂double＂ hysteresis loop. Only one resonance peak occurs at high magnetic fields in the in-plane ferromagnetic resonance spectra. The exchange field measured by both the magnetometry and ferromagnetic resonances is inversely proportional to the ferromagnetic layer thickness tFM. More remarkably, the exchange field determined by the ferromagnetic resonance is smaller than that of the magnetometry measurements. It is suggested to arise from the misalignment of the unidirectional anisotropie directions in neighboring domains.

关键词： condensed matter: electrical magnetic and optical Surfaces interfaces and thin films