Superimposed contributions to two-terminal and nonlocal spin signals in lateral spin-transport devices
Superimposed contributions to two-terminal and nonlocal spin signals in lateral spin-transport devices
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对横向自旋输运器件中两端和非局域自旋信号的叠加贡献
DOI：
10.1103/physrevb.104.144419
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发表时间：
2021
影响因子：
3.7
通讯作者：
Yuasa S.
中科院分区：
文献类型：
--
作者：
Jansen R.;Spiesser A.;Fujita Y.;Saito H.;Yamada S.;Hamaya K.;Yuasa S.
在宽磁场范围内，研究了具有铁磁隧道接触（Fe/MgO）和硅沟道的横向自旋输运器件中由自旋积累和Hanle自旋进动产生的自旋电压.信号分析揭示，为了解释两端磁阻和非局域自旋信号，需要考虑各种叠加的贡献，即，（i）由移动的载流子通过Si沟道从一个铁磁接触到另一个铁磁接触的自旋输运引起的自旋信号，因此取决于两个接触的相对磁化，（ii）也由Si沟道中的移动的载流子的自旋累积引起，但是在每个铁磁接触处分别产生的自旋信号，以及（iii）源于被限制在磁性隧道接触的Si/MgO界面处或附近的载流子的自旋累积的自旋信号，具有相当不同的自旋进动特性。也许令人惊讶的是，在thenonlocalspin信号一个明确的广泛的汉勒信号，从约束电子也被观察到，并认为是介导的热流从注入器到非本地检测器。
The spin voltages produced by spin accumulation and Hanle spin precession in a lateral spin-transport device with a silicon channel and ferromagnetic tunnel contacts (Fe/MgO) are probed for a wide range of magnetic fields. Signal analysis reveals that for the interpretation of the two-terminal magnetoresistance and the nonlocal spin signals, one needs to consider various superimposed contributions, namely, (i) spin signals arising from spin transport of mobile carriers through the Si channel from one ferromagnetic contact to the other, thus depending on the relative magnetization of the two contacts, (ii) spin signals also arising from the spin accumulation of mobile carriers in the Si channel but generated at each of the ferromagnetic contacts separately, and (iii) spin signals originating from spin accumulation of carriers that are confined at or near the Si/MgO interface of the magnetic tunnel contacts, with rather different spin precession characteristics. Perhaps surprisingly, in thenonlocalspin signal a clear broad Hanle signal from confined electrons is also observed, and argued to be mediated by heat flow from the injector to the nonlocal detector.