Spin-dependent tunneling spectroscopy in single-crystal Fe/MgO/Fe tunnel junctions
Spin-dependent tunneling spectroscopy in single-crystal Fe/MgO/Fe tunnel junctions
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DOI：
10.1063/1.2077861
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发表时间：
2005-10-03
影响因子：
4
通讯作者：
Yuasa, S
中科院分区：
文献类型：
--
作者：
Ando, Y;Miyakoshi, T;Yuasa, S
本文详细报道了Fe（001）/MgO（001）/Fe（001）磁性隧道结的自旋相关隧道谱。反平行磁配置的光谱显示不对称性，因为在势垒/电极界面的结构缺陷引起的非本征电子散射。令人惊讶的是，平行磁配置的光谱表现出复杂的振荡结构，从来没有观察到在传统的MTJ与氧化铝隧道势垒。复杂的光谱反映了通过界面共振态的隧穿过程。这些结果提供了一些信息，有助于阐明自旋相关的电子隧穿的物理和进一步提高磁电阻。(C)2005年美国物理学会。
We report a detailed spin-dependent tunneling spectroscopy in single-crystal Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions (MTJs) that show a giant tunnel magnetoresistance effect. Spectra for antiparallel magnetic configurations show asymmetry because of extrinsic electron scatterings caused by structural defects at the barrier/electrode interfaces. Surprisingly, spectra for parallel magnetic configurations exhibit a complex oscillatory structure that has never been observed in conventional MTJs with an aluminum-oxide tunnel barrier. The complex spectra reflect the tunneling process via interface resonant states. These results provide some information that helps to elucidate the physics of spin-dependent electron tunneling and to further enhance magnetoresistance. (C) 2005 American Institute of Physics.