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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium Characterization of Materials through High Resolution Imaging
Presentation Title Examining Dzyaloshinskii Domain Walls in Asymmetric Pt/Co/Ni/Ir Superlattices Using Lorentz TEM
Author(s) Maxwell P. Li, Marc De Graef, Vincent Sokalski
On-Site Speaker (Planned) Maxwell P. Li
Abstract Scope Spintronics have garnered a great deal of interest in recent years with emphasis in chiral spin textures, such as Dzyaloshinskii domain walls and Skyrmions, which can be manipulated with electric current with great efficiency. These structures are stabilized by the Dzyaloshinskii-Moriya interaction (DMI) which favors a perpendicular canting of neighboring spins. In this work, we contrast domain walls in superlattices based on symmetric [Co/Ni]N and asymmetric [Pt/Co/Ni/Ir]N using Lorentz TEM. We have previously shown symmetric Co/Ni superlattices to display a labyrinth domain structure consisting of Bloch walls in the un-tilted state indicating an absence of DMI. The asymmetric superlattice utilizes the known difference in signs of DMI from the Pt/Co and Ni/Ir interfaces which gives rise to an additive effect. Fresnel-mode images of asymmetric Pt/Co/Ni/Ir display no magnetic contrast in the un-tilted state. However, a clear labyrinth domain structure becomes apparent upon tilt indicating the presence of Dzyaloshinskii domain walls.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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