Tuning of the Dzyaloshinskii-Moriya Interaction by He$^+$ ion irradiation
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2020
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| author | Nembach, Hans T. Jué, Emilie Poetzger, Kay Fassbender, Juergen Silva, Thomas J. Shaw, Justin M. |
| author_facet | Nembach, Hans T. Jué, Emilie Poetzger, Kay Fassbender, Juergen Silva, Thomas J. Shaw, Justin M. |
| contents | We studied the impact of He$^+$ irradiation on the Dzyaloshinskii-Moriya interaction (DMI) in Ta/Co20Fe60B20/Pt/MgO samples. We found that irradiation with of 40 keV He$^+$ ions increases DMI by approximately 20% for fluences up to 2$\cdot$10$\rm{^{16}}$ $\rm{ions/cm}^2$ 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 of disorder at the interfaces. A moderate increase in disorder can increase the total number of triplets for the three-site exchange mechanism and can consequently increase the DMI. Our results demonstrate that the DMI can be locally engineered at the nanometer scale, providing a highly promising approach to advance skyrmion-based memories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2008_06762 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Tuning of the Dzyaloshinskii-Moriya Interaction by He$^+$ ion irradiation Nembach, Hans T. Jué, Emilie Poetzger, Kay Fassbender, Juergen Silva, Thomas J. Shaw, Justin M. Materials Science We studied the impact of He$^+$ irradiation on the Dzyaloshinskii-Moriya interaction (DMI) in Ta/Co20Fe60B20/Pt/MgO samples. We found that irradiation with of 40 keV He$^+$ ions increases DMI by approximately 20% for fluences up to 2$\cdot$10$\rm{^{16}}$ $\rm{ions/cm}^2$ 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 of disorder at the interfaces. A moderate increase in disorder can increase the total number of triplets for the three-site exchange mechanism and can consequently increase the DMI. Our results demonstrate that the DMI can be locally engineered at the nanometer scale, providing a highly promising approach to advance skyrmion-based memories. |
| title | Tuning of the Dzyaloshinskii-Moriya Interaction by He$^+$ ion irradiation |
| topic | Materials Science |
| url | https://arxiv.org/abs/2008.06762 |