Perpendicular magnetic anisotropy in conducting NiCo2O4 films from spin-lattice coupling
Perpendicular magnetic anisotropy in conducting NiCo2O4 films from spin-lattice coupling
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DOI：
10.1103/physrevb.101.014413
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发表时间：
2020-01-10
影响因子：
3.7
通讯作者：
Xu, Xiaoshan
中科院分区：
文献类型：
--
作者：
Mellinger, Corbyn;Waybright, Jace;Xu, Xiaoshan
高垂直磁各向异性（PMA）是纳米级自旋电子应用所需的特性，在氧化物导体中很少见。我们报道了在室温铁磁导体NiCo2O4外延薄膜中观察到的PMA高达0.23 MJ/m(3)。以磁弹性效应为表现的自旋-晶格耦合被认为是PMA的起源。钴在四面体上的x(2)-y(2)态对磁各向异性和自旋-晶格耦合起着至关重要的作用，其能量尺度为1 meV/f.u。微观起源的阐明为利用金属/氧杂化技术设计PMA氧化物导体铺平了道路。
High perpendicular magnetic anisotropy (PMA), a property needed for nanoscale spintronic applications, is rare in oxide conductors. We report the observation of a PMA up to 0.23 MJ/m(3) in modestly strained (-0.3%) epitaxial NiCo2O4 films which are room-temperature ferrimagnetic conductors. Spin-lattice coupling manifested as magnetoelastic effect was found as the origin of the PMA. The in-plane x(2)-y(2) states of Co on tetrahedral sites play crucial role in the magnetic anisotropy and spin-lattice coupling with an energy scale of 1 meV/f.u. The elucidation of the microscopic origin paves a way for engineering oxide conductors for PMA using metal/oxygen hybridizations.