Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets

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Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spintransfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium-iron-cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2019-09
Language
English
Article Type
Article
Citation

NATURE ELECTRONICS, v.2, no.9, pp.389 - 393

ISSN
2520-1131
DOI
10.1038/s41928-019-0303-5
URI
http://hdl.handle.net/10203/267893
Appears in Collection
PH-Journal Papers(저널논문)
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