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SKM 2021 – scientific programme

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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 Vogel11Institute 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)

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