Heteroepitaxy and ferromagnetism of EuO/MgO (001): A route towards combined spin- and symmetry-filter tunneling

Heteroepitaxy and ferromagnetism of EuO/MgO (001): A route towards combined spin- and symmetry-filter tunneling
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DOI：
10.1103/physrevb.88.245302
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发表时间：
2013-12
期刊：
Physical Review B
影响因子：
3.7
通讯作者：
C. Caspers;A. Gloskovskij;W. Drube;C. Schneider;Martin Müller
C. Caspers;A. Gloskovskij;W. Drube;C. Schneider;Martin Müller
中科院分区：
物理与天体物理2区
文献类型：
--
作者：
C. Caspers;A. Gloskovskij;W. Drube;C. Schneider;Martin Müller

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我们展示了直接在 MgO (001) 上具有块状铁磁性的超薄 EuO 薄膜的高质量异质外延，这是将磁绝缘体中的自旋滤波器隧道效应与通过单晶 MgO 势垒的对称滤波器隧道效应相结合的重要一步。尽管存在较大的压缩晶格失配，EuO 在 MgO (001) 上完全弛豫生长，并从第一个单层开始采用其体晶格参数。根据氧化物界面的不同静电原子构型讨论了这种初始异质外延生长模式。因此，单晶 EuO/MgO (001) 可以被设想为自旋电子学应用的高效双自旋选择性隧道势垒。
We demonstrate the high-quality heteroepitaxy of ultrathin EuO films with bulklike ferromagnetism directly on MgO (001), an important step towards combining the spin-filter tunnel effect in magnetic insulators and symmetry-filter tunneling through single-crystalline MgO barriers. Despite a large compressive lattice mismatch, EuO grows fully relaxed on MgO (001) and adopts its bulk lattice parameter from the first monolayer on. This initial heteroepitaxial growth mode is discussed in terms of different electrostatic atomic configurations of the oxides interface. Single-crystalline EuO/MgO (001) thus can be envisioned as highly effective double spin-selective tunnel barriers for spintronics applications.