Fernández-Pacheco Amalio, Vedmedenko Elena, Ummelen Fanny, Mansell Rhodri, Petit Dorothée, Cowburn Russell P
SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
Cavendish Laboratory, University of Cambridge, Cambridge, UK.
Nat Mater. 2019 Jul;18(7):679-684. doi: 10.1038/s41563-019-0386-4. Epub 2019 Jun 3.
The magnetic interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayered thin films can lead to chiral spin states, which are of paramount importance for future spintronic technologies. Interfacial DMI typically manifests as an intralayer interaction, mediated via a paramagnetic heavy metal in systems lacking inversion symmetry. Here we show that, by designing synthetic antiferromagnets with canted magnetization states, it is also possible to observe direct evidence of the interfacial interlayer DMI at room temperature. The interlayer DMI breaks the symmetry of the magnetic reversal process via the emergence of non-collinear spin states, which results in chiral exchange-biased hysteresis loops. The spin chiral interlayer interactions reported here are expected to manifest in a range of multilayered thin-film systems, opening up as yet unexplored avenues for the development and exploitation of chiral effects in magnetic heterostructures.
多层薄膜中的磁性界面Dzyaloshinskii-Moriya相互作用（DMI）可导致手性自旋态，这对未来的自旋电子技术至关重要。界面DMI通常表现为层内相互作用，在缺乏反演对称性的系统中通过顺磁重金属介导。在此我们表明，通过设计具有倾斜磁化状态的合成反铁磁体，也有可能在室温下观察到界面层间DMI的直接证据。层间DMI通过非共线自旋态的出现打破了磁反转过程的对称性，这导致了手性交换偏置的磁滞回线。本文报道的自旋手性层间相互作用预计将在一系列多层薄膜系统中表现出来，为磁性异质结构中手性效应的开发和利用开辟尚未探索的途径。
