DOI: 10.1038/s41598-017-01748-7. Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion

Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion

10.1038/s41598-017-01748-7

Crossref journal-article

Springer Science and Business Media LLC

Scientific Reports (297)

Abstract

AbstractDomain 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.

Bibliography

Lepadatu, S., Saarikoski, H., Beacham, R., Benitez, M. J., Moore, T. A., Burnell, G., Sugimoto, S., Yesudas, D., Wheeler, M. C., Miguel, J., Dhesi, S. S., McGrouther, D., McVitie, S., Tatara, G., & Marrows, C. H. (2017). Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion. Scientific Reports, 7(1).

Authors 15

Serban Lepadatu (first)
Henri Saarikoski (additional)
Robert Beacham (additional)
Maria Jose Benitez (additional)
Thomas A. Moore (additional)
Gavin Burnell (additional)
Satoshi Sugimoto (additional)
Daniel Yesudas (additional)
May C. Wheeler (additional)
Jorge Miguel (additional)
Sarnjeet S. Dhesi (additional)
Damien McGrouther (additional)
Stephen McVitie (additional)
Gen Tatara (additional)
Christopher H. Marrows (additional)

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Dates

Type	When
Created	8 years, 3 months ago (May 3, 2017, 10:52 a.m.)
Deposited	2 months, 1 week ago (June 17, 2025, 11:59 p.m.)
Indexed	2 weeks, 4 days ago (Aug. 6, 2025, 9:26 a.m.)
Issued	8 years, 3 months ago (May 9, 2017)
Published	8 years, 3 months ago (May 9, 2017)
Published Online	8 years, 3 months ago (May 9, 2017)

Funders 0

None

BibTeX

@article{Lepadatu_2017, title={Synthetic ferrimagnet nanowires with very low critical current density for coupled domain wall motion}, volume={7}, ISSN={2045-2322}, url={http://dx.doi.org/10.1038/s41598-017-01748-7}, DOI={10.1038/s41598-017-01748-7}, number={1}, journal={Scientific Reports}, publisher={Springer Science and Business Media LLC}, author={Lepadatu, Serban and Saarikoski, Henri and Beacham, Robert and Benitez, Maria Jose and Moore, Thomas A. and Burnell, Gavin and Sugimoto, Satoshi and Yesudas, Daniel and Wheeler, May C. and Miguel, Jorge and Dhesi, Sarnjeet S. and McGrouther, Damien and McVitie, Stephen and Tatara, Gen and Marrows, Christopher H.}, year={2017}, month=may }

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  "abstract": "<jats:title>Abstract</jats:title><jats:p>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 N\u00e9el wall structures, imaged using photoemission electron and Lorentz transmission electron microscopy, with a width of only ~100\u2009nm. The measured critical current density to set these walls in motion, detected using magnetotransport measurements, is 1.0\u2009\u00d7\u200910<jats:sup>11</jats:sup>\u2009Am<jats:sup>\u22122</jats:sup>, 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.</jats:p>",
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