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首页> 外文期刊>Journal of Crystal Growth >Magnetoresistance in carbon micro-coils annealed at various temperatures
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Magnetoresistance in carbon micro-coils annealed at various temperatures

机译：碳微线圈在不同温度下退火的磁阻

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摘要

Temperature dependence of the electric resistance and the magnetoresistance for both the as-grown carbon micro-coil obtained by chemical vapor deposition and those annealed at various temperatures up to 3000 deg C were measured in the range from 5 to 300 K. The resistivity and the activation energy decreases with increase in the annealing temperature, which seems to show that coils annealed at higher temperature are more highly graphitized. All annealed coils show negative magnetoresistance at least at low temperature and under low magnetic field, and the positive part of the magnetoresistance becomes predominant under high magnetic field and at high temperatures in highly graphitized coils annealed at temperatures higher than 2500 deg C.
机译：在5到300 K的范围内，测量了通过化学气相沉积获得的初生碳微线圈以及在高达3000℃的各种温度下退火的碳微线圈的电阻和磁阻的温度依赖性。活化能随退火温度的升高而降低，这似乎表明在较高温度下退火的线圈石墨化程度更高。所有退火的线圈至少在低温和低磁场下均显示负磁阻，而在高于2500摄氏度的温度下退火的高度石墨化的线圈中，磁电阻的正部分在高磁场和高温下占主导地位。

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