Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion
Abstract Domain walls in ferromagnetic nanowires are potential building-blocks of future technologies such as racetrack memories, in which data encoded in the domain walls are transported using spin-polarised currents. However, the development of energy-efficient devices has been hampered by the hig...
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2017
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oai:doaj.org-article:421ac66b213348bda4f0e25d451497a02021-12-02T16:06:12ZSynthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion10.1038/s41598-017-01748-72045-2322https://doaj.org/article/421ac66b213348bda4f0e25d451497a02017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01748-7https://doaj.org/toc/2045-2322Abstract Domain walls in ferromagnetic nanowires are potential building-blocks of future technologies such as racetrack memories, in which data encoded in the domain walls are transported using spin-polarised currents. However, the development of energy-efficient devices has been hampered by the high current densities needed to initiate domain wall motion. We show here that a remarkable reduction in the critical current density can be achieved for in-plane magnetised coupled domain walls in CoFe/Ru/CoFe synthetic ferrimagnet tracks. The antiferromagnetic exchange coupling between the layers leads to simple Néel wall structures, imaged using photoemission electron and Lorentz transmission electron microscopy, with a width of only ~100 nm. The measured critical current density to set these walls in motion, detected using magnetotransport measurements, is 1.0 × 1011 Am−2, almost an order of magnitude lower than in a ferromagnetically coupled control sample. Theoretical modelling indicates that this is due to nonadiabatic driving of anisotropically coupled walls, a mechanism that can be used to design efficient domain-wall devices.Serban LepadatuHenri SaarikoskiRobert BeachamMaria Jose BenitezThomas A. MooreGavin BurnellSatoshi SugimotoDaniel YesudasMay C. WheelerJorge MiguelSarnjeet S. DhesiDamien McGroutherStephen McVitieGen TataraChristopher H. MarrowsNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017) |
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DOAJ |
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Medicine R Science Q |
| spellingShingle |
Medicine R Science Q Serban Lepadatu Henri Saarikoski Robert Beacham Maria Jose Benitez Thomas A. Moore Gavin Burnell Satoshi Sugimoto Daniel Yesudas May C. Wheeler Jorge Miguel Sarnjeet S. Dhesi Damien McGrouther Stephen McVitie Gen Tatara Christopher H. Marrows Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| description |
Abstract Domain walls in ferromagnetic nanowires are potential building-blocks of future technologies such as racetrack memories, in which data encoded in the domain walls are transported using spin-polarised currents. However, the development of energy-efficient devices has been hampered by the high current densities needed to initiate domain wall motion. We show here that a remarkable reduction in the critical current density can be achieved for in-plane magnetised coupled domain walls in CoFe/Ru/CoFe synthetic ferrimagnet tracks. The antiferromagnetic exchange coupling between the layers leads to simple Néel wall structures, imaged using photoemission electron and Lorentz transmission electron microscopy, with a width of only ~100 nm. The measured critical current density to set these walls in motion, detected using magnetotransport measurements, is 1.0 × 1011 Am−2, almost an order of magnitude lower than in a ferromagnetically coupled control sample. Theoretical modelling indicates that this is due to nonadiabatic driving of anisotropically coupled walls, a mechanism that can be used to design efficient domain-wall devices. |
| format |
article |
| author |
Serban Lepadatu Henri Saarikoski Robert Beacham Maria Jose Benitez Thomas A. Moore Gavin Burnell Satoshi Sugimoto Daniel Yesudas May C. Wheeler Jorge Miguel Sarnjeet S. Dhesi Damien McGrouther Stephen McVitie Gen Tatara Christopher H. Marrows |
| author_facet |
Serban Lepadatu Henri Saarikoski Robert Beacham Maria Jose Benitez Thomas A. Moore Gavin Burnell Satoshi Sugimoto Daniel Yesudas May C. Wheeler Jorge Miguel Sarnjeet S. Dhesi Damien McGrouther Stephen McVitie Gen Tatara Christopher H. Marrows |
| author_sort |
Serban Lepadatu |
| title |
Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| title_short |
Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| title_full |
Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| title_fullStr |
Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| title_full_unstemmed |
Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| title_sort |
synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/421ac66b213348bda4f0e25d451497a0 |
| work_keys_str_mv |
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| _version_ |
1718385082193936384 |