SKM 2021 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 5: Posters Magnetism II
MA 5.4: Poster
Tuesday, September 28, 2021, 10:00–13:00, P
Modification of the DMI by He+ ion bombardment characterized by high-resolution optical Kerr microscopy — •Sapida Akhundzada1, Florian Ott1, Maxwell Li2, Tim Mewes3, Arno Ehresmann1, Vincent Sokalski2, and Michael Vogel1 — 1Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Kassel, Germany — 2Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, USA — 3Department of Physics and Astronomy, University of Alabama, Tuscaloosa, USA
The Dzyaloshinkii-Moriya interaction (DMI) is an antisymmetric exchange interaction arising, e.g., from interfaces between ferromagnets and heavy metals with large spin-orbit coupling [1]. The DMI is topologically stabilizing chiral spin-structures like skyrmions which are promising candidates for nonvolatile magnetic memory technologies [2]. It has been recently demonstrated that the DMI can be tuned by bombardment with accelerated ions [3]. While altering the interfaces between the different material layers in total, the sign and magnitude of the DMI can be manipulated [3]. In a systematic study, we modified the DMI by keV He ion bombardment in perpendicularly magnetized ferromagnetic/heavy metal multilayer system. In order to characterize the interfacial DMI, we characterized the field-driven, asymmetric growth of the magnetic domains by high-resolution Kerr microscopy.
[1] T. Moriya, Phys. Rev. Lett. 4, 228 (1960)
[2] A. Fert, V. Cros and J. Sampaio, Nat. Nanotechnol. 8, 152 (2013)
[3] H. T. Nembach, et al., arXiv:2008.06762 (2020)