0-p oscillations in nanostructured Nb/Fe/Nb Josephson junctions
0-p oscillations in nanostructured Nb/Fe/Nb Josephson junctions
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纳米结构 Nb/Fe/Nb 约瑟夫森结中的 0-p 振荡
DOI：
10.1140/epjb/e2007-00210-8
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Piano S
中科院分区：
文献类型：
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作者：
Piano S
铁磁约瑟夫森结中 π 相移的物理原理可能会为自旋电子器件和量子计算提供一系列应用。我们通过将 Fe 势垒厚度从 0.5 nm 改变到 5.5 nm，研究 Nb/Fe/Nb 约瑟夫森结中从“0”到“π”态的转变。根据磁性测量，我们估计 Fe 的磁死层约为 1.1 nm。通过将特征电压振荡与现有理论模型进行拟合，我们推断出交换能量为 256 meV，费米速度为 1.98 ×105m/s，电子平均自由程为 6.2 nm，与其他报告值一致。根据 ICRN 产物的温度依赖性，我们表明其衰减率随 Fe 势垒厚度呈现非单调振荡行为。
The physics of the π phase shift in ferromagnetic Josephson junctions may enable a range of applications for spin-electronic devices and quantum computing. We investigate transitions from “0” to “π” states in Nb/Fe/Nb Josephson junctions by varying the Fe barrier thickness from 0.5 nm to 5.5 nm. From magnetic measurements we estimate for Fe a magnetic dead layer of about 1.1 nm. By fitting the characteristic voltage oscillations with existing theoretical models we extrapolate an exchange energy of 256 meV, a Fermi velocity of 1.98 ×105m/s and an electron mean free path of 6.2 nm, in agreement with other reported values. From the temperature dependence of the ICRNproduct we show that its decay rate exhibits a nonmonotonic oscillatory behavior with the Fe barrier thickness.