论文标题
在钴/六角硼硝酸盐界面上相互作用的强dzyaloshinskii-moriya互动的证据
Evidence of Strong Dzyaloshinskii-Moriya Interaction at the Cobalt/Hexagonal Boron Nitride Interface
论文作者
论文摘要
在PT或AU上生长的四个系列CO膜（1-2.2 nm厚）上测量了Dzyaloshinskii-Moriya相互作用（DMI）和垂直磁各向异性（PMA），并用H-BN或CU覆盖。清洁H-BN/CO界面是通过去角质的H-BN并将其转移到超高vacuum蒸发室中的Co膜上获得的。通过比较H-BN和CU覆盖的样品，提取了由CO/H-BN界面诱导的DMI，并发现与PT/CO界面的强度相当，PT/CO界面是最大的已知值之一。尽管H-BN中的自旋轨道相互作用弱弱，但观察到的DMI与最近的理论结果一致。在PT/CO/H-BN异质结构中与PT/CO结合使用后，发现在室温和低磁场下稳定天空的PMA和DMI甚至更强。
The Dzyaloshinskii-Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) were measured on four series of Co films (1-2.2 nm thick) grown on Pt or Au and covered with h-BN or Cu. Clean h-BN/Co interfaces were obtained by exfoliating h-BN and transferring it onto the Co film in situ in the ultra-high-vacuum evaporation chamber. By comparing h-BN and Cu-covered samples, the DMI induced by the Co/h-BN interface was extracted and found to be comparable in strength to that of the Pt/Co interface, one of the largest known values. The strong observed DMI despite the weak spin-orbit interaction in h-BN supports a Rashba-like origin in agreement with recent theoretical results. Upon combination of it with Pt/Co in Pt/Co/h-BN heterostructures, even stronger PMA and DMI are found which stabilizes skyrmions at room temperature and a low magnetic field.
