Kuświk Piotr, Głowiński Hubert, Coy Emerson, Dubowik Janusz, Stobiecki Feliks
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
J Phys Condens Matter. 2017 Nov 1;29(43):435803. doi: 10.1088/1361-648X/aa834d.
Nowadays, the CoFeB thin layered film is intensively studied because of its potential applications in spintronic devices, especially devices based on spin-transfer torque phenomena. Hitherto, it has been shown that CoFeB may possess perpendicular magnetic anisotropy (PMA) when it is sandwiched between different layers (e.g. MgO, Pt, Pd, Ta, W). However, there is no experimental evidence that CoFeB, sandwiched between Au layers, has strong PMA. Moreover, in comparison with other noble metals, Au-based film systems exhibit the smallest spin pumping effect, which provides the main contribution to the damping in thin films in contact with heavy metals. Therefore, Au/CoFeB/Au may be a good candidate for future applications, where perpendicular magnetic anisotropy and low damping are required. Here, we show that PMA and low damping can be achieved in a Au/CoFeB/Au system without annealing.
如今，由于其在自旋电子器件，特别是基于自旋转移矩现象的器件中的潜在应用，CoFeB 薄膜受到了广泛研究。迄今为止，已经表明，当 CoFeB 夹在不同层（如 MgO、Pt、Pd、Ta、W）之间时，它可能具有垂直磁各向异性（PMA）。然而，没有实验证据表明夹在 Au 层之间的 CoFeB 具有强 PMA。此外，与其他贵金属相比，基于 Au 的薄膜系统表现出最小的自旋泵浦效应，这对与重金属接触的薄膜中的阻尼起主要作用。因此，Au/CoFeB/Au 可能是未来需要垂直磁各向异性和低阻尼应用的良好候选材料。在此，我们表明在未经退火的 Au/CoFeB/Au 系统中可以实现 PMA 和低阻尼。
