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DOI码：10.1109/LMAG.2019.2914007

发表刊物：IEEE Magnetics Letters

刊物所在地：美国

摘要：Previous experiments have shown that perpendicular magnetic anisotropy (PMA) in trilayers consisting of a CoFeB layer, an MgO layer, and a nonmagnetic metal (NM) layer depends strongly on whether the CoFeB layer was grown on the top of an NM layer or was capped by an NM layer. In this letter, we study the physical origin of this phenomenon through first-principles calculations. We took MgO/CoFe/Ta and Ta/CoFe/MgO as model structures and analyzed the magnetic anisotropy energy (MAE) therein. The “substrate/Ta/CoFe/MgO” structure had a notably higher MAE than the “substrate/MgO/CoFe/Ta” structure. This difference results mainly from different stresses in the Ta layers, and the latter gives rise to a difference in the hybridization strength of in-plane orbits (d xy , d x 2 -y 2 , p x , and p y ). The p-orbital hybridization in the Ta layers contributes significantly to the PMA in both structures.

论文编号：4503504

学科门类：工学

是否译文：否

发表时间：2019-04-29