Ni量子細線におけるコンダクタンスの切断時間依存性 : 磁性体物理

概要

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The conductance quantization of Ni nano-wire was investigated by using break-junction techniques. When the width of the nano-wire decreased rapidly, the conductance in remanent magnetization states was observed to be quantized in units of 2e^2/h. The unit of quantization switched to e^2/h when a magnetic field was applied. When the width of the nano-wire varied slowly, however, quantized conductance plateaus in units of e^2/h appeared in the remanent state. Even in this case, the plateaus with ne^2/h (n = 2, 4, 6, . . . ) were observed to be more stable than those with ne^2/h (n = 1, 3, 5, . . . ). The results imply the relevance of the local magnetic domain structure around the contact, as well as its reconfiguration by the magnetic field, to conductance quantization in ferromagnets.
社団法人日本磁気学会の論文
2002-04-01