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  • AIP Publishing  (11)
  • 1
    Online Resource
    Online Resource
    CoPt–C nanogranular magnetic thin films
    AIP Publishing ; 1997
    In:  Applied Physics Letters Vol. 71, No. 23 ( 1997-12-08), p. 3427-3429
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 71, No. 23 ( 1997-12-08), p. 3427-3429
    Abstract: Cobalt–platinum–carbon thin film was deposited with a chemical composition of Co50Pt15C35. The film had a nanogranular morphology with a grain size ranging from 5 to 15 nm. It consisted of cobalt–platinum grains which had a faulted hexagonal close-packed phase and were separated by graphitelike carbon boundaries. The film in-plane coercivity was 1500 Oe, compared to a few hundreds oersteds in the case of cobalt–carbon. This result establishes a way of fabricating high coercivity cobalt–carbon based materials, which have potential applications as high density magnetic recording media.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.120356
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Formation and microstructural analysis of co-sputtered thin films consisting of cobalt nanograins embedded in carbon
    AIP Publishing ; 1997
    In:  Journal of Applied Physics Vol. 82, No. 5 ( 1997-09-01), p. 2200-2208
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 82, No. 5 ( 1997-09-01), p. 2200-2208
    Abstract: Cobalt–carbon thin films were deposited with a carbon concentration ranging from 27 to 57 at.% at different substrate temperatures. The morphology and phases of as-deposited films were investigated by transmission electron microscopy and x-ray diffraction. The effect of annealing on the microstructure is reported. Under particular conditions of substrate temperature, carbon concentration, and subsequent annealing, a granular morphology consisting of nanocrystalline cobalt grains embedded in graphitelike carbon was obtained. The cobalt grains were uniform in size. The particle size could be controlled in the range from 4 to 7 nm by varying the carbon concentration. The cobalt phase was found to depend on the carbon concentration and substrate temperature. The hexagonal close-packed cobalt phase was observed only via the formation of the metastable carbide δ′-Co2C and its subsequent decomposition upon annealing. Otherwise the cobalt phase has a heavily faulted close-packed structure or a random stacking structure.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.366026
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 3
    Online Resource
    Online Resource
    First results of a high-current electron cyclotron resonance proton source
    AIP Publishing ; 1996
    In:  Review of Scientific Instruments Vol. 67, No. 3 ( 1996-03-01), p. 1240-1242
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 67, No. 3 ( 1996-03-01), p. 1240-1242
    Abstract: A 2.45 GHz electron cyclotron resonance (ECR) ion source for producing a 100 mA H+ beam is under study. The microwave power is coupled through a quartz window and a water-cooled 90° waveguide bend in order to avoid the heating of the electrons backstreaming from the source. The ECR condition is obtained with dc magnetic coils. Preliminary results reported here show that a beam current density of 75 mA/cm2 can be extracted at 10 kV from a 3-mm-diam aperture, with 1.2 kW of microwave power at 1×10−3 mbar of hydrogen pressure. The proton fraction is 75% with an alumina-coated plasma electrode and 85% with a nitride coating.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1146643
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Some particular aspects of the physics of the ECR sources for multicharged ions
    AIP Publishing ; 1990
    In:  Review of Scientific Instruments Vol. 61, No. 1 ( 1990-01-01), p. 236-238
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 61, No. 1 ( 1990-01-01), p. 236-238
    Abstract: This article emphasizes a confinement model for electrons and ions in an ECR source for multicharged ions, on the basis of specific measurements performed on the 16.6 GHz MINIMAFIOS and 10 GHz CAPRICE facilities. The conclusions partially support the above model.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1141305
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1990
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 5
    Online Resource
    Online Resource
    Narrowband thermal emission from Tamm plasmons of a modified distributed Bragg reflector
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 113, No. 16 ( 2018-10-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 113, No. 16 ( 2018-10-15)
    Abstract: Tamm plasmons (TPs), which exist at the interface between a metallic film and a distributed Bragg reflector (DBR), can be thermally excited and then out-coupled as thermal radiation, providing a means to realize easy-to-fabricate and wavelength-selective infrared emitters. A modified TP structure consisting of a DBR having a thick layer adjacent to the metallic film is proposed and high-intensity and narrowband thermal emission of the structure is demonstrated. The modified TP structure sustains a higher order TP mode with a higher quality factor (Q-factor) emittance peak than a standard TP structure. The measurement of the emission at 150 °C of the proposed TP structure reveals an emittance peak with a maximum value of 0.94, a background of 0.01, and a Q-factor of 48 at a wavelength around 5 μm. Moreover, a wide range of emission wavelengths (from 4.4 μm to 5.7 μm) is experimentally realized by adjusting the last DBR-layer thickness, thus demonstrating a fine selection of the emission peak wavelength.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5048950
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Plasmonic nanochannel structure for narrow-band selective thermal emitter
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 25 ( 2017-06-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 25 ( 2017-06-19)
    Abstract: A plasmonic structure consisting of a periodic arrangement of vertical silicon nanochannels connected by U-shaped gold layers is demonstrated as a spectrally selective thermal emitter. The plasmonic nanochannel structure sustains a coupled mode between a surface plasmon polariton and a stationary surface plasmon resonance, which induces a strong and sharp resonance observed in the form of a reflectance dip in the far field. Upon heating the structure, a strong and narrow-bandwidth thermal emittance peak is observed with a maximum emittance value of 0.72 and a full-width-at-half-maximum of 248 nm at a wavelength of 5.66 μm, which corresponds to the reflectance dip wavelength. Moreover, we demonstrate the control of the emission peak wavelength by varying the period of the structure. The plasmonic nanochannel structure realizes a small-size and selective infrared thermal emitter, which is expected to be applicable as an infrared light source.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4989692
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Status of development of ECR ion sources at Grenoble (invited)
    AIP Publishing ; 1994
    In:  Review of Scientific Instruments Vol. 65, No. 4 ( 1994-04-01), p. 1051-1056
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 65, No. 4 ( 1994-04-01), p. 1051-1056
    Abstract: This article gives a short summary of the performances of the electron cyclotron resonance ion sources (ECRIS) so far built by the Grenoble laboratory; emphasis is given to the high B field Caprice source, a compact in size source delivering high charge states and high intensities. Both the continuous regime of operation, and the pulsed regime having performances enhanced by the afterglow effect, as well as other noticeable effects, are surveyed. The next part of the article deals with the analysis of the data and our present understanding of the ECRIS behavior. At last the present trends of development of ECRIS are examined.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1145113
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 8
    Online Resource
    Online Resource
    Plane-grating flat-field soft x-ray spectrometer
    AIP Publishing ; 2005
    In:  Review of Scientific Instruments Vol. 76, No. 2 ( 2005-02-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 76, No. 2 ( 2005-02-01)
    Abstract: We describe a soft x-ray spectrometer covering the 120–800 eV range. It is intended for resonant inelastic x-ray scattering experiments performed at third generation synchrotron radiation (SR) facilities and has been developed with SOLEIL, the future French national SR source in mind. The Hettrick–Underwood principle is at the heart of the design using a combination of varied line-spacing plane grating and spherical-mirror to provide a flat-field image. It is slitless for optimum acceptance. This means the source size determines the resolving power. A spot size of ⩽5μm is planned at SOLEIL which, according to simulations, should ensure a resolving power ⩾1000 over the whole energy range. A 1024×1024 pixel charge-coupled device (CCD) with a 13μm×13μm pixel size is used. This is an improvement on the use of microchannel-plate detectors, both as concerns efficiency and spatial resolution. Additionally spectral line curvature is avoided by the use of a horizontal focusing mirror concentrating the beam in the nondispersing direction. It allows for readout using a binning mode to reduce the intrinsically large CCD readout noise. Preliminary results taken at beamlines at Elettra (Trieste) and at BESSY (Berlin) are presented.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.1852313
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 9
    Online Resource
    Online Resource
    Spectrally selective photodetection in the near-infrared with a gold grating-based hot electron structure
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 116, No. 16 ( 2020-04-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 116, No. 16 ( 2020-04-20)
    Abstract: A Si channel-separated interdigitated Au grating structure is demonstrated to achieve spectrally selective photodetection in the C-band (1530–1565 nm) in this work. The measured full width at half-maximum of the structure reaches as narrow as 23 nm, and the measured responsivity reaches 804 nA/mW at the resonant wavelength of 1550 nm and the bias voltage of 0.08 V. The responsivity represents a large variation of 59% when the light wavelength is varied by only 20 nm (from 1550 to 1530 nm). A theoretical model is also performed to quantify the photocurrent response in terms of the optical and electrical properties of the structure. The strongly resonant and narrowband photocurrent response and readily tunable resonant wavelength not only enable the structure to achieve spectrally selective photodetection in the near-infrared region but also make it amenable to the application of sensing devices, imaging devices, and other optoelectronic devices working in the sub-bandgap regime of semiconductor materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5144029
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Modeling and experimental characterization of the plasma produced by a velvet cathode in a linear induction accelerator
    AIP Publishing ; 2018
    In:  Physics of Plasmas Vol. 25, No. 8 ( 2018-08-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 25, No. 8 ( 2018-08-01)
    Abstract: A high power electron diode is used to generate an intense high quality pulsed electron beam (2.6 kA, 4 MeV) in order to produce a bremsstrahlung radiation pulse for the first axis of the flash radiography facility named Epure. The plasma created by surface flashover of the velvet cathode provides a zero work function emitter used to produce the space-charge-limited electron beam. In order to optimize the design of diodes and to better understand the plasma dynamics, we have developed a 0D Collisional-Radiative Model (CRM) which describes the time-dependent evolution of the density of the plasma species in three plasma compositions: 100% H, 95% H + 5% C, and 64% H + 31% O + 5% C. The non-equilibrium electron energy distribution functions (EEDFs) are pre-calculated for a large range of electron mean energies for each mixture. EEDFs and cross sections of electron impact processes are then used to tabulate the electron rate coefficients needed to simulate the time-dependent plasma species densities. The evolution of the electron mean energy is estimated through the electron beam current density itself inferred from particle-in-cell calculations experimentally validated. Visible emission spectroscopy measurements were performed in order to investigate the plasma composition, to measure the Hα/Hβ intensity ratio, and to estimate the electron density. It was shown that the electron density in our setup is between 1014 and 1016 cm−3. Experimental results were compared to the 0D CRM. Results from the time-dependent CRM show that for the three studied plasma compositions, maximum electron densities range from 0.9 × 1014 cm−3 to 1.7 × 1014 cm−3 and that the electron energy averaged over the time interval of the electronic beam pulse is about 3.5 eV. An estimate of the electron energy inside the plasma during the relaxation provides values ranging from 0.10 eV to 0.12 eV based on comparison between the calculated and measured Hα/Hβ intensity ratio averaged over 5 μs. Moreover, main reactions involved in the evolution of the electron density were pointed out.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5038012
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472746-8
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