Influence of epitaxial strain on the perpendicular magnetic anisotropy of Fe/MgO systems
Influence of epitaxial strain on the perpendicular magnetic anisotropy of Fe/MgO systems
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DOI：
10.1103/physrevb.104.l140406
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发表时间：
2021-10
影响因子：
3.7
通讯作者：
M. Shiga;S. Sakamoto;Takuya Tsujikawa;Ryoya Ando;K. Amemiya;S. Miwa
中科院分区：
文献类型：
--
作者：
M. Shiga;S. Sakamoto;Takuya Tsujikawa;Ryoya Ando;K. Amemiya;S. Miwa
铁磁体/氧化物系统中的周向磁各向异性（PMA）由于其在自旋电子学应用中的巨大潜力而引起了相当大的关注;然而，对此类系统中PMA增强的原因的理解仍然不足。本文研究了外延应变对Fe/MgO系统中PMA的影响。PMA能随Fe面内晶格常数的减小而单调增加，退火后PMA能进一步增加。我们发现，PMA能量的界面分量在很大程度上不受外延应变和退火过程的影响，其体成分的变化起着重要的作用。这项研究导致了全面的了解PMA和电压控制的磁各向异性效应的磁性薄膜。
Perpendicular magnetic anisotropy (PMA) in ferromagnet/oxide systems has attracted considerable attention owing to its significant potential in spintronic applications; however, an understanding of the causes of PMA enhancement in such systems remains inadequate. This study investigates the influence of epitaxial strain on PMA in the Fe/MgO system. The PMA energy increases monotonically as the in-plane lattice constant of Fe decreases, and increases further after annealing. We find that the interface component of the PMA energy is largely unaffected by the epitaxial strain and annealing process, and that changes in its bulk component play an important role. This study leads to a comprehensive understanding of PMA and voltage-controlled magnetic anisotropy effects in ultrathin magnetic films.