Causes of drain current local variability are analyzed by decomposing into current variability components. Besides V TH and G m components, it is newly found that effects of "current onset" variability caused by channel potential fluctuations largely contribute to the current variability and that G m component is relatively small in the saturation region. It is shown that both V TH and current onset components decreases with reducing channel dopants, indicating that intrinsic channel is very effective to reduce current variability. (Keywords: Current variability, V TH , current onset, and G m ) 978-1-4244-7641-1/10/$26.00 ©2010 IEEE

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Ni–Zn ferrite films were prepared by spin-spray ferrite plating method at 90 °C on glass substrates from a reaction solution of FeCl2(+FeCl3)+NiCl2+ZnCl2 and an oxidizing solution of NaNO2+CH3COONH4. The complex permeability μ=μ′−iμ″ values of the as-plated films were measured at frequencies up to 3 GHz. The Ni0.28Zn0.18Fe2.54O4 film 0.40 μm in thickness plated using the mixture of Fe2+ and Fe3+ as iron ions exhibited a high μ′ of around 42 and a resonance frequency fr of 1.2 GHz. This fr value is about nine times as high as the 130 MHz that was estimated from Snoek’s limit for the Ni–Zn ferrite bulk ceramics. Since μ′ also exhibited a maximum value of about 35, the films prepared in this study will be applicable to both rf inductors and wave absorbers for electromagnetic interference suppression.

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Articles you may be interested inStudy on thermal properties and crystallization behavior of electron beam irradiated ethylene vinyl acetate (EVA)/waste tyre dust (WTD) blends in the presence of polyethylene graft maleic anhydride (PEgMAH) AIP Conf.Thermally stimulated depolarization current studies of poly(ethylene oxide) and poly(ethylene oxide) complexed with potassium thiocyanate Thermally stimulated currents (TSC) from polyethylene and ethylene-vinyl-acetate copolymers with a variety of vinyl-acetate contents have been investigated using a TSC technique with x-ray irradiation. Five main TSC peaks, which we believe are due to trapped carriers, were observed in these polymers. The detrapping of carriers is closely related to molecular-chain motions, and trapping sites are assigned to physical defects such as cavities formed by local arrangements of molecular chains rather than carbonyl groups. One of the TSC peaks is associated with traps in the amorphous region, one with traps in the boundary region between the amorphous and the crystalline regions, i.e., in the folded region, and another with traps in the crystalline region. The TSC spectrum from the dipole of the vinyl-acetate unit under a bias field shows a TSC peak accompanied by a current inversion. The average effective dipole moment for the vinyl-acetate unit was determined to be about 1.8 D from a TSC analysis.PACS numbers: 72.20.Jv, 71.5S.Ht, 61.80.Cb a The DSC was measured at the heating rate of 10 K/min.

Teruyoshi MIZUTANI,•õ Yasuo SUZUOKI •õ. and Masayuki IEDA •õ•õ A ZnO-Bi2O3 two-layer composite film formed by rf sputtering was studied as a model of a single grain boundary in a ZnO varistor. The current-voltageand thermallystimulated currents (TSC) were measured.The ZnO-Bi203 two-layer films showed highly non-linear conduction.A negative charge and associated potential barrier at the ZnO-Bi2O3 interface controlled the conduction.The breakdown voltage was also affected by the thickness of the Bi2O3 layer. This and TSC experiments showed that space charge was responsible for the thickness dependence. This system can be used as a thin-film varistor and a humidity sensor because of its high non-linearity coefficient (60-100), and high sensitivity and fast response to humidity.

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