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arXiv 1306.5847cond-mat.mtrl-sci
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通过在GaAs上氧化超薄Al外延层制备的结晶AlOx隧道势垒的有效自旋注入

Efficient spin injection through a crystalline AlOx tunnel barrier prepared by the oxidation of an ultra-thin Al epitaxial layer on GaAs

N. Nishizawa, H. Munekata

摘要:

我们报告说,超薄,后氧化铝外延生长在AlGaAs表面工程作为一个高品质的隧道势垒自旋注入从铁磁金属到半导体。本发明的氧化方法的关键点之一是在不氧化Al/AlGaAs界面附近的AlGaAs区域的情况下形成结晶AlOx模板层。氧化的Al层不是无定形的,而是显示出令人联想到尖晶石γ-AlOx相的明确的单晶特征。由Fe层、结晶AlOx阻挡层和AlGaAs-InGaAs双异质结构组成的自旋LED在Fe层的剩余磁化状态下表现出圆偏振的圆偏振电致发光,圆偏振为P_{EL} = 0.145,表明相对高的自旋注入效率(λ = 2 P_{EL} / P_{Fe})为0.63。

英文摘要:

We report that an ultra-thin, post-oxidized aluminum epilayer grown on the AlGaAs surface works as a high-quality tunnel barrier for spin injection from a ferromagnetic metal to a semiconductor. One of the key points of the present oxidation method is the formation of the crystalline AlOx template layer without oxidizing the AlGaAs region near the Al/AlGaAs interface. The oxidized Al layer is not amorphous but show well-defined single crystalline feature reminiscent of the spinel gamma-AlOx phase. A spin-LED consisting of an Fe layer, a crystalline AlOx barrier layer, and an AlGaAs-InGaAs double hetero-structure has exhibited circularly polarized electroluminescence with circular polarization of P_{EL} = 0.145 at the remnant magnetization state of the Fe layer, indicating the relatively high spin injection efficiency (epsilon = 2P_{EL} / P_{Fe}) of 0.63.

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