Interfacial oxygen migration and its effect on the magnetic anisotropy in Pt/Co/MgO/Pt films
Interfacial oxygen migration and its effect on the magnetic anisotropy in Pt/Co/MgO/Pt films
复制标题
Pt/Co/MgO/Pt薄膜界面氧迁移及其对磁各向异性的影响
DOI：
10.1063/1.4864184
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发表时间：
2014-02-03
影响因子：
4
通讯作者：
Yu, Guang Hua
中科院分区：
文献类型：
--
作者：
Chen, Xi;Feng, Chun;Yu, Guang Hua
本文报道了铂/钴/氧化镁/铂薄膜的界面氧迁移效应及其引起的磁各向异性演化。在沉积氧化镁的过程中，氧化镁中的氧原子与邻近的钴原子结合，在钴/氧化镁界面形成氧化钴。同时，薄膜表现出面内磁各向异性。退火热处理后，CoO中的大部分氧原子迁移回了MgO层，从而明显改善了Co/MgO界面，增强了有效的Co-O轨道杂化。这有利于磁各向异性从IMA向垂直磁各向异性(PMA)的演化。氧的迁移效应是通过Co/MgO界面上的氧化还原反应实现的。相反，由于缺乏界面氧迁移，在铂/钴/铂薄膜中不能观察到从IMA到PMA的转移。
This paper reports the interfacial oxygen migration effect and its induced magnetic anisotropy evolution in Pt/Co/MgO/Pt films. During depositing the MgO layer, oxygen atoms from the MgO combine with the neighboring Co atoms, leading to the formation of CoO at the Co/MgO interface. Meanwhile, the films show in-plane magnetic anisotropy (IMA). After annealing, most of the oxygen atoms in CoO migrate back to the MgO layer, resulting in obvious improvement of Co/MgO interface and the enhancement of effective Co-O orbital hybridization. These favor the evolution of magnetic anisotropy from IMA to perpendicular magnetic anisotropy (PMA). The oxygen migration effect is achieved by the redox reaction at the Co/MgO interface. On the contrary, the transfer from IMA to PMA cannot be observed in Pt/Co/Pt films due to the lack of interfacial oxygen migration.