Underlayer material influence on electric-field controlled perpendicular magnetic anisotropy in CoFeB/MgO magnetic tunnel junctions

作者：Skowronski Witold^*; Nozaki Takayuki; Lam Duong D; Shiota Yoichi; Yakushiji Kay; Kubota Hitoshi; Fukushima Akio; Yuasa Shinji; Suzuki Yoshishige

来源：Physical Review B, 2015, 91(18): 184410.

DOI：10.1103/PhysRevB.91.184410

We study the dependence of the perpendicular magnetic anisotropy on the underlayer material in magnetic tunnel junction. Using several different 4d and 5d metals we identify an optimal seed layer in terms of high anisotropy, low mixing, and high thermal stability. In such systems we investigate the tunability of the anisotropy by means of electric fields. Especially, by using Was the underlayer of the CoFeB/MgO/CoFeB trilayer we could obtain good thermal stability that allows for annealing in the temperatures up to 450 degrees C, which results in high perpendicular anisotropy.

• 出版日期2015-5-18