扩散氢对Fe/MgO/Fe磁性隧道结电导影响的原子模拟
Effect of Diffused Hydrogen on the Conductance of Fe/Mgo/Fe Magnetic Tunnel Junctions: Atomistic Simulation
摘要：
本文用第一性原理计算方法分析了Fe-MgO-Fe磁性隧道结氧化镁势垒制备过程中，间隙中氢原子的扩散对电导的影响。这种氢原子在阻挡层间隙空隙中的扩散干扰了氧化镁所具有的某种对称性，通常称为δ 1状态对称性。δ 1态对称性的畸变使磁隧道结的磁阻变小，特别是在并联结构中，这反过来又在很大程度上降低了隧道磁阻TMR。改进的制造方法可用于解决影响器件操作的此类问题。
英文摘要：
In this work we have analysed the deterimental effect on conductance caused by diffusion of hydrogen atoms in interstitial voids during fabrication process of magnesium oxide barrier of an Fe MgO Fe magnetic tunnel junction, using first principle calculations. This diffusion of hydrogen atoms in interstitial voids in barrier disturbs a certain kind of symmetry possessed by magnesium oxide often termed as delta 1 state symmetry. Distortion in delta 1 state symmetry tempers the condutance through the magnetic tunnel junction specially in parallel configuration, which in turn reduces the Tunnelling Magneto Resistance TMR to large extent. Improved methods of fabrication can be used to counter such kind of problems which affect device operation.
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