Perpendicular magnetization of Co2FeAl full-Heusler alloy films induced by MgO interface
Perpendicular magnetization of Co2FeAl full-Heusler alloy films induced by MgO interface
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DOI：
10.1063/1.3600645
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发表时间：
2011-06
影响因子：
4
通讯作者：
Z. Wen;H. Sukegawa;S. Mitani;K. Inomata
中科院分区：
文献类型：
--
作者：
Z. Wen;H. Sukegawa;S. Mitani;K. Inomata
在CFA/MgO和MgO/CFA两种结构中，Co2 FeAl（CFA）全Heusler合金薄膜均实现了垂直磁化，其垂直磁各向异性能量密度（KU）为2-3×106 erg/cm 3，可用作亚50 nm尺寸高热稳定性MgO基磁性隧道结（MTJ）的垂直铁磁电极。研究了不同退火温度下KU的CFA厚度依赖性，表明CFA的垂直各向异性是由CFA和MgO之间的界面各向异性贡献的。这封信将开辟一条获得钴基全赫斯勒合金的垂直磁化的途径，这是有希望的进一步降低在MgO基MTJ纳米柱与垂直的全赫斯勒合金电极的电流感生磁化翻转的临界电流。
The perpendicular magnetization of Co2FeAl (CFA) full-Heusler alloy films was achieved in the structures of CFA/MgO and MgO/CFA with the perpendicular magnetic anisotropy energy density (KU) of 2–3×106 erg/cm3, which can be used as the perpendicular ferromagnetic electrodes of MgO-based magnetic tunnel junctions (MTJs) with high thermal stability at sub-50-nm dimension. The CFA thickness dependence of KU was investigated at different annealing temperatures, indicating that the perpendicular anisotropy of CFA is contributed by the interfacial anisotropy between CFA and MgO. This letter will open up a way for obtaining perpendicular magnetization of Co-based full-Heusler alloys, which is promising for further reduction in the critical current of current induced magnetization switching in MgO-based MTJ nanopillars with perpendicular full-Heusler alloy electrodes.