arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.01180cond-mat.mes-hall
收藏

具有周期性光栅势垒的磁相干隧道结

Magnetic coherent tunnel junctions with periodic grating barrier

Henan Fang, Mingwen Xiao, Wenbin Rui, Jun Du, Zhikuo Tao

摘要:

本文发展了一种新的自旋电子学理论,用于研究具有单晶势垒的磁性隧道结。势垒将被视为具有层内周期性的衍射光栅,因此隧穿电子的衍射波包含强相干性,无论是在电荷中还是在自旋中。该理论可以回答MgO基MTJ中存在的两个基本问题:(1)为什么隧道磁电阻(TMR)随势垒厚度振荡?(2)为什么当两个电极都是半金属时,TMR仍然远离无穷大?本工作也可以解释和再现TMR的其他主要特征。这也为调制TMR振荡,增强TMR使其趋于无穷大提供了可能的途径。在理论上,势垒作为一种周期性的衍射光栅,可以摆脱宽度的限制,可以从纳米尺度变化到微米尺度。基于这些结果,提出了下一代MTJ,其中三个部件可以单独制造,然后组装在一起,它特别适合于分层材料,例如,MoS2和石墨,最适用于工业。

英文摘要:

A new spintronic theory has been developed for the magnetic tunnel junction (MTJ) with single-crystal barrier. The barrier will be treated as a diffraction grating with intralayer periodicity, the diffracted waves of tunneling electrons thus contain strong coherence, both in charge and especially in spin. The theory can answer the two basic problems present in MgO-based MTJs: (1) Why does the tunneling magnetoresistance (TMR) oscillate with the barrier thickness? (2) Why is the TMR still far away from infinity when the two electrodes are both half-metallic? Other principal features of TMR can also be explained and reproduced by the present work. It also provides possible ways to modulate the oscillation of TMR, and to enhance TMR so that it can tend to infinity. Within the theory, the barrier, as a periodic diffraction grating, can get rid of the confinement in width, it can vary from nanoscale to microscale. Based on those results, a future-generation MTJ is proposed where the three pieces can be fabricated separately and then assembled together, it is especially appropriate for the layered materials, e.g., MoS2 and graphite, and most feasible for industries.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑