Magnetic tunnel junctions with single-crystal electrodes: A crystal anisotropy of tunnel magneto-resistance
Magnetic tunnel junctions with single-crystal electrodes: A crystal anisotropy of tunnel magneto-resistance
复制标题
DOI：
10.1209/epl/i2000-00445-5
复制
发表时间：
2000-11
期刊：
影响因子：
1.8
通讯作者：
S. Yuasa;T. Sato;E. Tamura;Yoshishige Suzuki;H. Yamamori;K. Ando;T. Katayama
中科院分区：
文献类型：
--
作者：
S. Yuasa;T. Sato;E. Tamura;Yoshishige Suzuki;H. Yamamori;K. Ando;T. Katayama
实验证实了铁磁电极的晶体取向对隧道磁电阻（TMR）有很强的依赖性。研究了不同晶向的单晶Fe电极对Fe/Al_2O_3/Fe_（50）Co_（50）隧道结的TMR效应，发现当晶向由（100）变为（211）时，2K时的TMR比由13%提高到42%（室温时为8%~ 26%）。这种TMR各向异性可以解释在铁体和/或界面电子态的各向异性自旋极化。讨论了隧道势垒“动量过滤”效应的重要性。
A strong dependence of tunnel magnetoresistance (TMR) on the crystal orientation of ferromagnetic electrodes was confirmed experimentally. We studied the TMR of Fe/Al2O3/Fe50Co50 tunnel junctions with single-crystal Fe electrodes of different crystal orientations and found that the TMR ratio increased from 13% to 42% at 2K (8% to 26% at room temperature) when the crystal orientation was changed from (100) to (211). Such a TMR anisotropy could be explained in terms of the anisotropic spin polarization of Fe bulk and/or interface electronic states. The importance of the "momentum-filtering" effect of the tunnel barrier was also discussed.