Tuning of the Dzyaloshinskii–Moriya interaction by He+ ion irradiation
| Autor: | Hans T. Nembach, Emilie Jué, Kay Poetzger, Juergen Fassbender, Thomas J. Silva, Justin M. Shaw |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 131:143901 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/5.0080523 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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