Tuning of the Dzyaloshinskii-Moriya interaction by He+ ion irradiation
Tuning of the Dzyaloshinskii-Moriya interaction by He+ ion irradiation
Nembach, H. T.; Jué, E.; Potzger, K.; Faßbender, J.; Silva, T. J.; Shaw, J. M.
Abstract
We studied the impact of He+ irradiation on the Dzyaloshinskii-Moriya interaction (DMI) in Ta/Co20Fe60B20/Pt/MgO samples. We found that irradiation of 40 keV He+ ions increases the DMI by approximately 20% for fluences up to 2 × 1016 ions/cm2 before it decreases for higher fluence values. In contrast, the interfacial anisotropy shows a distinctly different fluence dependence. To better understand the impact of the ion irradiation on the Ta and Pt interfaces with the Co20Fe60B20 layer, we carried out Monte-Carlo simulations, which showed an expected increase in disorder at the interfaces. A moderate increase in disorder increases the total number of triplets for the three-site exchange mechanism and consequently increases the DMI. Our results demonstrate the significance of disorder for the total DMI.
Keywords: Dzyaloshinskii-Moriya interaction; Fluence dependence; Ions irradiation
Beteiligte Forschungsanlagen
- Ionenstrahlzentrum DOI: 10.17815/jlsrf-3-159
Verknüpfte Publikationen
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 34640) publication
-
Journal of Applied Physics 131(2022)14, 143901
DOI: 10.1063/5.0080523
Cited 10 times in Scopus
Downloads
Permalink: https://www.hzdr.de/publications/Publ-34640