• Title/Summary/Keyword: Multilayers

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Epitaxial Growth and Characterization of Zinc-blende CrAs/GaAs/MnAs/GaAs Multilayers

  • Wang W.H.;Manago T.;Akinaga H.
    • Journal of Magnetics
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    • v.11 no.1
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    • pp.1-4
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    • 2006

  • We report on the growth, structural and transport properties of zinc-blende CrAs/GaAs/MnAs/GaAs multilayers on GaAs(001) substrates. Structural analyses using in-situ reflection high-energy electron diffraction and exsitu cross-sectional transmission electron microscopy confirmed the realization of a zinc-blende crystal structure. Room temperature Hall measurements reveal that the as-grown multilayer exhibits p-type conductivity with a very low resistivity of $0.052\;\omega{cm}$, a high carrier concentration of $6.2X10^{19}\;cm^{-3}$ and a Hall mobility of $1.8\;cm^2/Vs$. We also observed a clear decrease of the resistivity in samples after low temperature annealing.

  • https://doi.org/10.4283/JMAG.2006.11.1.001 인용 PDF KSCI

Visibility Enhancement of the Ultrasonic Signal Reflected from Adhesive Layers (접착층에서 반사된 초음파 신호의 가시도 개선)

  • Shin, Jin Seob;Lee, Jeong-Ihll
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.8 no.6
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    • pp.153-157
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    • 2008

  • Recently, electronic devices is produced by multilayer structure, therefore analysis for hidden layers is important nondestructive inspection. This paper presents visibility enhancement methods for the ultrasonic multiple echoes reflected from adhesive layer in the multilayers using digital signal processing. The reflected signals from the multilayers come out interval of the peaks in the power cepstrum. In the experiment, the adhesive layers of settled thickness using epoxy were formed. The reflected signals from the multilayer is detected by pulse-echo method and power cepstrum is processed for enhancement of visibility.

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