Spin-orbit coupling effect by minority interface resonance states in single-crystal magnetic tunnel junctions
Spin-orbit coupling effect by minority interface resonance states in single-crystal magnetic tunnel junctions
复制标题
DOI：
10.1103/physrevb.86.184420
复制
发表时间：
2011-06
影响因子：
3.7
通讯作者：
Y. Lu;H. Yang;C. Tiușan;M. Hehn;M. Chshiev;C. Bellouard;B. Kierren;G. Lengaigne;A. Duluard;D. Lacour;F. Montaigne
中科院分区：
文献类型：
--
作者：
Y. Lu;H. Yang;C. Tiușan;M. Hehn;M. Chshiev;C. Bellouard;B. Kierren;G. Lengaigne;A. Duluard;D. Lacour;F. Montaigne
在全外延Fe/MgO/Fe磁性隧道结（MTJ）中发现了少数界面共振态（IRS）的对称性散射效应。两种类型的样品与碳掺杂的底部Fe/MgO界面和没有被制造代表两种不同类型的IRS在少数沟道附近的费米能级。通过对第一性原理计算的局域态密度（LDOS）和低偏压下平行结构电导随温度的变化关系的分析，我们发现无碳样品中的IRS主要是δ 5对称性。这有一个主要的贡献上的大多数delta 1到delta 5通道散射，并解释了在低温下的平行配置中的delta 5电导的增强。此外，发现碳掺杂界面中IRS的光谱组成主要由δ 1对称性决定，这是平行电导中δ 5通道被抑制的原因。
Symmetry dependent scattering effect by minority interface resonance states (IRS) has been evidenced in full-epitaxial Fe/MgO/Fe magnetic tunnel junctions (MTJs). Two types of samples with and without carbon doped bottom Fe/MgO interface were fabricated to represent two different types of IRS in the minority channel in the vicinity of the Fermi level. By analysis of the first- principles calculated local density of states (LDOS) and the temperature dependence of conductance in parallel configuration at low bias, we show that the IRS in the carbon free sample is dominated by the delta5 symmetry. This has a major contribution on the majority deltai to delta5 channel scattering and explains the enhancement of the delta5 conductance in the parallel configuration at low temperature. Furthermore, the spectral composition of the IRS in the carbon doped interface is found to be dominated by the delta1 symmetry, which is responsible for the suppression of delta5 channel in the parallel conductance.