Emergence of Huge Negative Spin-Transfer Torque in Atomically Thin Co layers

Title
Emergence of Huge Negative Spin-Transfer Torque in Atomically Thin Co layers
Authors
민병철박용근제숭근유상철김주성박민호문준최석봉
Issue Date
2017-04
Publisher
Physical review letters
Citation
VOL 118, NO 16-167205-6
Abstract
Current-induced domain wall motion has drawn great attention in recent decades as the key operational principle of emerging magnetic memory devices. As the major driving force of the motion, the spin-orbit torque on chiral domain walls has been proposed and is currently extensively studied. However, we demonstrate here that there exists another driving force, which is larger than the spin-orbit torque in atomically thin Co films. Moreover, the direction of the present force is found to be the opposite of the prediction of the standard spin-transfer torque, resulting in the domain wall motion along the current direction. The symmetry of the force and its peculiar dependence on the domain wall structure suggest that the present force is, most likely, attributed to considerable enhancement of a negative nonadiabatic spintransfer torque in ultranarrow domain walls. Careful measurements of the giant magnetoresistance manifest a negative spin polarization in the atomically thin Co films which might be responsible for the negative spin-transfer torque.
URI
http://pubs.kist.re.kr/handle/201004/66628
ISSN
0031-9007
Appears in Collections:
KIST Publication > Article
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