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Influence of Magnesium Substitution on Thermal and Electrical Properties of NiCuZn Ferrites for Microinductor Core Applications 镁取代对NiCuZn铁氧体热电性能的影响
Physics Research International Pub Date : 2012-05-08 DOI: 10.1155/2012/861690
M. Ramana, N. R. Reddy, K. Kumar
{"title":"Influence of Magnesium Substitution on Thermal and Electrical Properties of NiCuZn Ferrites for Microinductor Core Applications","authors":"M. Ramana, N. R. Reddy, K. Kumar","doi":"10.1155/2012/861690","DOIUrl":"https://doi.org/10.1155/2012/861690","url":null,"abstract":"Two series of NiMgCuZn ferrites, that is, (1) NixMg0.6−xCu0.1Zn0.3Fe2O4 and sample G: Ni0.3Mg0.3−yCu0.1Zn0.5−yFe2O4 with , 0.1, 0.2, 0.3 and (2) NixMg0.6−xCu0.1Zn0.3Fe2O4 with , 0.1, 0.2 were synthesized and prepared by conventional ceramic double-sintering process and to use them as core materials for microinductor applications. The formation of single phase was confirmed by X-ray diffraction. The temperature and compositional variation of DC, AC electrical conductivities (σ) and thermoelectric power were studied on these two series of polycrystalline ferrospinels. The studies were carried out in wide range of temperature from 30 to 350°C. On the basis of thermoelectric study, the ferrites under present work were found to be shown as n-type and p-type transition. The electrical conduction in these ferrospinels is explained in the light of polaron hopping mechanism. These ferrite compositions have been developed for their use as core materials for microinductor applications.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"29 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82039990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Generalized Analytical Solutions for Nonlinear Positive-Negative Index Couplers
Physics Research International Pub Date : 2012-05-08 DOI: 10.1155/2012/945807
Z. Kudyshev, G. Venugopal, N. Litchinitser
{"title":"Generalized Analytical Solutions for Nonlinear Positive-Negative Index Couplers","authors":"Z. Kudyshev, G. Venugopal, N. Litchinitser","doi":"10.1155/2012/945807","DOIUrl":"https://doi.org/10.1155/2012/945807","url":null,"abstract":"We find and analyze a generalized analytical solution for nonlinear wave propagation in waveguide couplers with opposite signs of the linear refractive index, nonzero phase mismatch between the channels, and arbitrary nonlinear coefficients.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"1 1 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77316494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
Nuclear Wavepacket Dynamics of Alkali Adsorbates on Metal Surfaces Studied by Time-Resolved Second Harmonic Generation 金属表面碱吸附核波包动力学的时间分辨二次谐波研究
Physics Research International Pub Date : 2012-04-11 DOI: 10.1155/2012/172987
Kazuya Watanabe, Y. Matsumoto
{"title":"Nuclear Wavepacket Dynamics of Alkali Adsorbates on Metal Surfaces Studied by Time-Resolved Second Harmonic Generation","authors":"Kazuya Watanabe, Y. Matsumoto","doi":"10.1155/2012/172987","DOIUrl":"https://doi.org/10.1155/2012/172987","url":null,"abstract":"This paper reviews recent efforts to understand the dynamics of coherent surface vibrations of alkali atoms adsorbed on metal surfaces. Time-resolved second harmonic generation is used for the coherent excitation and detection of the nuclear wavepacket dynamics of the surface modes. The principles of the measurement and the experimental details are described. The main focus is on coverage and excitation photon energy dependences of the coherent phonon dynamics for Na-, K-, and Cs-covered Cu(111). The excitation mechanism of the coherent phonon has been revealed by the ultrafast time-domain technique and theoretical modelings.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"49 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2012-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86090274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Second-Order Nonlinear Optical Microscopy of a H–Si(111)1 × 1 Surface in Ultra-High Vacuum Conditions 超高真空条件下H-Si (111)1 × 1表面的二阶非线性光学显微镜
Physics Research International Pub Date : 2012-04-11 DOI: 10.1155/2012/576547
Y. Miyauchi
{"title":"Second-Order Nonlinear Optical Microscopy of a H–Si(111)1 × 1 Surface in Ultra-High Vacuum Conditions","authors":"Y. Miyauchi","doi":"10.1155/2012/576547","DOIUrl":"https://doi.org/10.1155/2012/576547","url":null,"abstract":"This paper reviews the use of optical sum frequency generation (SFG) and second harmonic generation (SHG) microscopy under ultra-high vacuum (UHV) conditions to observe the dynamics of a hydrogen terminated Si(111)1 × 1 surface. First, we took SFG and SHG microscopic images of the surface after IR light pulse irradiation and found that the SHG and nonresonant SFG signals were enhanced, probably due to the formation of dangling bonds after hydrogen desorption. Second, we observed time-resolved SFG intensity images of a H–Si(111)1 × 1 surface. After visible pump light irradiation, the nonresonant SFG signal increased at probe delay time 0 ps and then decreased over a life time of 565 ps. The resonant SFG signal reduced dramatically at 0 ps and then recovered with an anisotropic line shape over a life time of 305 ps. The areas of modulated SFG signals at delay time 277 ps were expanded with an anisotropic aspect. Finally, we observed SFG intensity images of hydrogen deficiency on a Si(111)1 × 1 surface as a function of temperature. These images of the H–Si(111) surface, taken with a spatial resolution of 5 μm at several temperatures from 572 to 744 K, showed that the hydrogen desorbs homogeneously.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"51 1 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2012-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91123814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Control of Cross-Sections and Optical Nonlinearity of Pt Nanowires and the Roughness Effect Pt纳米线截面和光学非线性的控制及粗糙度效应
Physics Research International Pub Date : 2012-04-09 DOI: 10.1155/2012/969835
Y. Ogata, G. Mizutani
{"title":"Control of Cross-Sections and Optical Nonlinearity of Pt Nanowires and the Roughness Effect","authors":"Y. Ogata, G. Mizutani","doi":"10.1155/2012/969835","DOIUrl":"https://doi.org/10.1155/2012/969835","url":null,"abstract":"In this paper we review our fabrication of Pt nanowire arrays on MgO(110) faceted templates by a shadow deposition method and our control of their cross-sectional shapes by adjusting the deposition directions of platinum. We obtained nanowire arrays with and macroscopic symmetries. These macroscopic symmetries influence optical second harmonic generation (SHG) susceptibility elements of the nanowire arrays sensitively. On the other hand, the roughness of the nanowires had an effect on the rotational SHG patterns as a function of the sample rotation angle around the surface normal. We tried to explain the pattern change by a second-order perturbation scheme with respect to the roughness amplitude.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"53 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81540131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Improvement of Thermal Stability of Nd-Tb-Fe-Co-B Sintered Magnets by Additions of Pr, Ho, Al, and Cu Pr、Ho、Al和Cu对Nd-Tb-Fe-Co-B烧结磁体热稳定性的改善
Physics Research International Pub Date : 2012-04-09 DOI: 10.1155/2012/416717
A. Lukin, E. Il’yashenko, A. Skjeltorp, G. Helgesen
{"title":"Improvement of Thermal Stability of Nd-Tb-Fe-Co-B Sintered Magnets by Additions of Pr, Ho, Al, and Cu","authors":"A. Lukin, E. Il’yashenko, A. Skjeltorp, G. Helgesen","doi":"10.1155/2012/416717","DOIUrl":"https://doi.org/10.1155/2012/416717","url":null,"abstract":"The present work investigates the influence of Pr, Al, Cu, B and Ho which were introduced into the Co-containing sintered magnets of Nd-Dy-Tb-Fe-Co-B type on the magnetic parameters (, , , ). The effect of heat treatment parameters on magnetic properties was also studied. It was revealed that the essential alloying of NdFeB magnets by such elements as Dy, Tb, Ho, Co as well as by boron-forming elements, for example, by titanium, may lead to reducing of F-phase quantity, and, as a consequence, to decreasing of magnetic parameters. It was also shown that additional doping of such alloys by Pr, B, Al and Cu leads to a significant increase of the quantity of F-phase in magnets as well as solubility of the Dy, Tb, Ho and Co in it. This promotes the increase of magnetic parameters. It was possible to attain the following properties for the magnets (Nd0,15Pr0,35Tb0,25Ho0,25)15(Fe0,71Co0,29)bal · Al0,9Cu0,1B8,5 (at. %) after optimal thermal treatment {1175 K (3,6–7,2 ks) with slow (12–16 ks) cooling to 675 K and subsequently remaining at  K for 3,6 ks—hardening}:  T,  kA/m,  kJ/m3, %/K in the temperature interval 223–323 K.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"43 3","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72630636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Fundamental Problems of the Electrodynamics of Heterogeneous Media 非均质介质电动力学基本问题
Physics Research International Pub Date : 2012-04-08 DOI: 10.1155/2012/185647
N. Grinchik, Yu. N. Grinchik
{"title":"Fundamental Problems of the Electrodynamics of Heterogeneous Media","authors":"N. Grinchik, Yu. N. Grinchik","doi":"10.1155/2012/185647","DOIUrl":"https://doi.org/10.1155/2012/185647","url":null,"abstract":"The consistent physic-mathematical model of propagation of an electromagnetic wave in a heterogeneous medium is constructed using the generalized wave equation and the Dirichlet theorem. Twelve conditions at the interfaces of adjacent media are obtained and justified without using a surface charge and surface current in explicit form. The conditions are fulfilled automatically in each section of counting schemes for calculations. A consistent physicomathematical model of interaction of nonstationaly electric and thermal fields in a layered medium with allowance or mass transfer is constructed. The model is based on the methods of thermodynamics and on the equations of an electromagnetic field and is formulated without explicit separation of the charge carriers and the charge of an electric double layer.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"26 1","pages":"1-28"},"PeriodicalIF":0.0,"publicationDate":"2012-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82142996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Magneto-Optical and Magnetic Studies of Co-Rich Glass-Covered Microwires 富钴玻璃包覆微线的磁光和磁研究
Physics Research International Pub Date : 2012-04-01 DOI: 10.1155/2012/690793
A. Chizhik, V. Zhukova
{"title":"Magneto-Optical and Magnetic Studies of Co-Rich Glass-Covered Microwires","authors":"A. Chizhik, V. Zhukova","doi":"10.1155/2012/690793","DOIUrl":"https://doi.org/10.1155/2012/690793","url":null,"abstract":"The magnetization reversal process in the surface and volume areas of Co-rich glass-covered microwires has been investigated. The study has been performed in the wide series of microwires with chemical composition, geometry (thickness of glass coating) with the purpose of the tailoring of the giant magnetoimpedance effect. The comparative analysis of the magnetoelectric, magnetic, and magneto-optical experiments permits to optimise the giant magnetoimpedance ratio and elucidate the main properties of the magnetization reversal process in the different parts of the Co-rich microwire.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"24 1","pages":"1-20"},"PeriodicalIF":0.0,"publicationDate":"2012-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82350959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Sintering of Soft Magnetic Material under Microwave Magnetic Field 微波磁场下软磁材料的烧结
Physics Research International Pub Date : 2012-03-29 DOI: 10.1155/2012/165849
S. Takayama, J. Fukushima, J. Nishijo, Midori Saito, S. Sano, Motoyasu Sato
{"title":"Sintering of Soft Magnetic Material under Microwave Magnetic Field","authors":"S. Takayama, J. Fukushima, J. Nishijo, Midori Saito, S. Sano, Motoyasu Sato","doi":"10.1155/2012/165849","DOIUrl":"https://doi.org/10.1155/2012/165849","url":null,"abstract":"We have developed a simple process for sintering of soft magnetization materials using microwave sintering. The saturated magnetization (Ms) of sintered magnetite was 85.6 emu/g, which was as high as 95% of magnetite before heating (90.4 emu/g). On the other hand, the averaged remanence (Mr) and coercivity (Hc) of the magnetite after heating were 0.17 emu/g and 1.12 Oe under measuring limit of SQUID, respectively. For the sintering process of soft magnetic materials, magnetic fields of microwave have been performed in nitrogen atmosphere. Therefore, a microwave single-mode system operating at a frequency of 2.45 GHz and with a maximum power level of 1.5 kW was used. We can sinter the good soft magnetic material in microwave magnetic field. The sample shrank to 82% theoretical density (TD) from 45%TD of green body. The sintered sample was observed the microstructure by TEM and the crystal size was estimated the approximate average size is 10 nm.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"38 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2012-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84977149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Metamagnetic Phase Transitions in (..).. Ceramics (…)..的超磁相变。陶瓷
Physics Research International Pub Date : 2012-03-25 DOI: 10.1155/2012/632016
F. Bukhanko
{"title":"Metamagnetic Phase Transitions in (..).. Ceramics","authors":"F. Bukhanko","doi":"10.1155/2012/632016","DOIUrl":"https://doi.org/10.1155/2012/632016","url":null,"abstract":"The temperature dependences of ac magnetic susceptibility of the (Sm0.5Gd0.5)0.55Sr0.45MnO3 ceramics provide evidence of the formation of a mixed insulating state with a specific quantum-disordered phase, in which the domains with a long-range antiferromagnetic order dominate at temperatures below 𝑇N≅48,5 K. Irreversible metamagnetic phase transition in the ferromagnetically ordered state is carried out at the critical field 𝐻c1∼25 kOe which remains constant in the temperature range from 4.2 K to 60 K. From the analysis of the magnetization isotherms, the conclusion can be made about a spontaneous phase transition into the state with charge and orbital ordering at temperatures below the critical value 𝑇CO∼60 K. It is supposed that short-range charge correlations exist in unusually large interval of temperatures ~90 K at temperatures above 𝑇CO that considerably exceeds the area of existence of local orbital correlations ~50 K.","PeriodicalId":20143,"journal":{"name":"Physics Research International","volume":"4 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86401133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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