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Tuning of the Dzyaloshinskii–Moriya interaction by He+ ion irradiation
- Source :
- Journal of Applied Physics. 131:143901
- Publication Year :
- 2022
- Publisher :
- AIP Publishing, 2022.
-
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.
- Subjects :
- General Physics and Astronomy
Subjects
Details
- ISSN :
- 10897550 and 00218979
- Volume :
- 131
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physics
- Accession number :
- edsair.doi...........882fd4f4784cb2e30c1fd3608881ba9a