Exchange coupling torque in ferrimagnetic Co/Gd bilayer maximized near angular momentum compensation temperature View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Robin Bläsing, Tianping Ma, See-Hun Yang, Chirag Garg, Fasil Kidane Dejene, Alpha T N’Diaye, Gong Chen, Kai Liu, Stuart S. P. Parkin

ABSTRACT

Highly efficient current-induced motion of chiral domain walls was recently demonstrated in synthetic antiferromagnetic (SAF) structures due to an exchange coupling torque (ECT). The ECT derives from the antiferromagnetic exchange coupling through a ruthenium spacer layer between the two perpendicularly magnetized layers that comprise the SAF. Here we report that the same ECT mechanism applies to ferrimagnetic bi-layers formed from adjacent Co and Gd layers. In particular, we show that the ECT is maximized at the temperature TA where the Co and Gd angular momenta balance each other, rather than at their magnetization compensation temperature TM. The current induced velocity of the domain walls is highly sensitive to longitudinal magnetic fields but we show that this not the case near TA. Our studies provide new insight into the ECT mechanism for ferrimagnetic systems. The high efficiency of the ECT makes it important for advanced domain wall based spintronic devices. More... »

PAGES

4984

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41467-018-07373-w

DOI

http://dx.doi.org/10.1038/s41467-018-07373-w

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1110065930

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30478261


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34 schema:description Highly efficient current-induced motion of chiral domain walls was recently demonstrated in synthetic antiferromagnetic (SAF) structures due to an exchange coupling torque (ECT). The ECT derives from the antiferromagnetic exchange coupling through a ruthenium spacer layer between the two perpendicularly magnetized layers that comprise the SAF. Here we report that the same ECT mechanism applies to ferrimagnetic bi-layers formed from adjacent Co and Gd layers. In particular, we show that the ECT is maximized at the temperature T<sub>A</sub> where the Co and Gd angular momenta balance each other, rather than at their magnetization compensation temperature T<sub>M</sub>. The current induced velocity of the domain walls is highly sensitive to longitudinal magnetic fields but we show that this not the case near T<sub>A</sub>. Our studies provide new insight into the ECT mechanism for ferrimagnetic systems. The high efficiency of the ECT makes it important for advanced domain wall based spintronic devices.
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