CAJ | 학술논문

利用基于密度泛函理论和非平衡态格林函数的第一性原理计算研究了CoFe/MgO/CoFe磁性隧道结的隧穿磁电阻效应。给出了该隧道结隧穿磁电阻与偏压的依赖关系，并计算了平行结构与反平行结构相应的I-V特性曲线和传输谱。通过在一侧电极与势垒层之间插入反铁磁金属Cr层，观察到了隧穿磁电阻、电导随插入层Cr层数增加发生衰减和2个原子层周期的振荡现象，这主要是由于Cr拥有反铁磁结构，在Cr/ MgO界面形成了与Cr磁矩取向相关的界面散射。
이용기우밀도범함이론화비평형태격림함수적제일성원리계산연구료CoFe/MgO/CoFe자성수도결적수천자전조효응。급출료해수도결수천자전조여편압적의뢰관계，병계산료평행결구여반평행결구상응적I-V특성곡선화전수보。통과재일측전겁여세루층지간삽입반철자금속Cr층，관찰도료수천자전조、전도수삽입층Cr층수증가발생쇠감화2개원자층주기적진탕현상，저주요시유우Cr옹유반철자결구，재Cr/ MgO계면형성료여Cr자구취향상관적계면산사。
We carried out the first-principles calculations based on density functional theory ( DFT) and non-e-quilibrium Green function ( NEGF) to investigate the tunneling magnetoresistance ( TMR) effect in CoFe/MgO/CoFe magnetic tunnel junctions. The TMR dependence on bias voltage was displayed and corresponding I-V curves and transmission spectra with parallel and antiparallel alighnment were also provided. By inserting antifer-romagnetic Cr layer between one electrode and the barrier, the decay and 2-layer-period oscillation phenomenon in TMR ratio were found. This effect is attributed to the interface scattering on Cr/MgO interface related to Cr magnetic orientation which is arisen by the antiferromagnetic ordering of Cr layer.