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arXiv 1104.3718cond-mat.mes-hall
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MgO保护层银纳米线的自旋弛豫机制

Spin relaxation mechanism in Silver nanowires covered with MgO protection layer

H. Idzuchi, Y. Fukuma, L. Wang, Y. Otani

摘要:

利用坡莫合金/银横向自旋阀的非局域自旋阀测量方法研究了具有MgO表面保护层的银纳米线的自旋翻转机制。介导的表面散射的自旋翻转事件有效地抑制了MgO盖层。自旋弛豫过程在Elliott-Yafet机制的框架下得到了很好的描述,从而精确地确定了纳米线中声子或杂质介导的动量散射的自旋-filp散射几率.温度依赖的自旋-晶格弛豫遵循布洛赫-格吕奈森理论,并落在一价金属的通用曲线上,如从体材料的传导电子自旋共振数据确定的莫诺和伯纽标度中。

英文摘要:

Spin-flip mechanism in Ag nanowires with MgO surface protection layers has been investigated by means of nonlocal spin valve measurements using Permalloy/Ag lateral spin valves. The spin flip events mediated by surface scattering are effectively suppressed by the MgO capping layer. The spin relaxation process was found to be well described in the framework of Elliott-Yafet mechanism and then the probabilities of spin-filp scattering for phonon or impurity mediated momentum scattering is precisely determined in the nanowires. The temperature dependent spin-lattice relaxation follows the Bloch-Grüneisen theory and falls on to a universal curve for the monovalent metals as in the Monod and Beuneu scaling determined from the conduction electron spin resonance data for bulk.

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