SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.4: Poster

Dienstag, 28. September 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)