Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers
Thermally activated domain-wall (DW) motion driven by magnetic field and electric current is investigated experimentally in out-of-plane magnetized Pt(Co/Pt)3 multilayers. We directly extract the thermal activation energy barrier for DW motion and observe the dynamic regimes of creep, depinning, and...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | en_US |
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Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/108649 |
| _version_ | 1811078442407428096 |
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| author | Emori, Satoru Umachi, Chinedum K. Bono, David C Beach, Geoffrey Stephen |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering Emori, Satoru Umachi, Chinedum K. Bono, David C Beach, Geoffrey Stephen |
| author_sort | Emori, Satoru |
| collection | MIT |
| description | Thermally activated domain-wall (DW) motion driven by magnetic field and electric current is investigated experimentally in out-of-plane magnetized Pt(Co/Pt)3 multilayers. We directly extract the thermal activation energy barrier for DW motion and observe the dynamic regimes of creep, depinning, and viscous flow. Further analysis reveals that the activation energy must be corrected with a factor dependent on the Curie temperature, and we derive a generalized Arrhenius-like equation governing thermally activated motion. By using this generalized equation, we quantify the efficiency of current-induced spin torque in assisting DW motion. Current produces no effect aside from Joule heating in the multilayer with 7-Å thick Co layers, whereas it generates a finite spin torque on DWs in the multilayer with atomically thin 3-Å Co layers. These findings suggest that conventional spin-transfer torques from in-plane spin-polarized current do not drive DWs in ultrathin Co/Pt multilayers. |
| first_indexed | 2024-09-23T10:59:45Z |
| format | Article |
| id | mit-1721.1/108649 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:59:45Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1086492022-10-01T00:28:01Z Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers Emori, Satoru Umachi, Chinedum K. Bono, David C Beach, Geoffrey Stephen Massachusetts Institute of Technology. Department of Materials Science and Engineering Emori, Satoru Umachi, Chinedum K. Bono, David C Beach, Geoffrey Stephen Thermally activated domain-wall (DW) motion driven by magnetic field and electric current is investigated experimentally in out-of-plane magnetized Pt(Co/Pt)3 multilayers. We directly extract the thermal activation energy barrier for DW motion and observe the dynamic regimes of creep, depinning, and viscous flow. Further analysis reveals that the activation energy must be corrected with a factor dependent on the Curie temperature, and we derive a generalized Arrhenius-like equation governing thermally activated motion. By using this generalized equation, we quantify the efficiency of current-induced spin torque in assisting DW motion. Current produces no effect aside from Joule heating in the multilayer with 7-Å thick Co layers, whereas it generates a finite spin torque on DWs in the multilayer with atomically thin 3-Å Co layers. These findings suggest that conventional spin-transfer torques from in-plane spin-polarized current do not drive DWs in ultrathin Co/Pt multilayers. 2017-05-03T19:48:24Z 2017-05-03T19:48:24Z 2014-10 2014-10 Article http://purl.org/eprint/type/JournalArticle 0304-8853 http://hdl.handle.net/1721.1/108649 Emori, Satoru; Umachi, Chinedum K.; Bono, David C. and Beach, Geoffrey S.D. “Generalized Analysis of Thermally Activated Domain-Wall Motion in Co/Pt Multilayers.” Journal of Magnetism and Magnetic Materials 378 (March 2015): 98–106. © 2014 Elsevier B.V. en_US http://dx.doi.org/10.1016/j.jmmm.2014.10.147 Journal of Magnetism and Magnetic Materials Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier arXiv |
| spellingShingle | Emori, Satoru Umachi, Chinedum K. Bono, David C Beach, Geoffrey Stephen Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title | Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title_full | Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title_fullStr | Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title_full_unstemmed | Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title_short | Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers |
| title_sort | generalized analysis of thermally activated domain wall motion in co pt multilayers |
| url | http://hdl.handle.net/1721.1/108649 |
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