Enhancement of spin Hall effect induced torques for current-driven magnetic domain wall motion: Inner interface effect
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractWe investigate the current-induced domain wall motion in perpendicular magnetized Tb/Co wires with structure inversion asymmetry and different layered structures. We find that the critical current density to drive domain wall motion strongly depends on the layered structure. The lowest critical current density ∼15MA/cm2 and the highest slope of domain wall velocity curve are obtained for the wire having thin Co sublayers and more inner Tb/Co interfaces, while the largest critical current density ∼26MA/cm2 required to drive domain walls is observed in the Tb-Co alloy magnetic wire. It is found that the Co/Tb interface contributes negligibly to Dzyaloshinskii-Moriya interaction, while the effective spin-orbit torque strongly depends on the number of Tb/Co inner interfaces (n). An enhancement of the antidamping torques by extrinsic spin Hall effect due to Tb rare-earth impurity-induced skew scattering is suggested to explain the high efficiency of current-induced domain wall motion.
CitationEnhancement of spin Hall effect induced torques for current-driven magnetic domain wall motion: Inner interface effect 2016, 93 (17) Physical Review B
SponsorsThis work was partially supported by the Ministry of Education, Culture, Sports, Science and Technology, Japan - Supported Program for Strategic Research Foundation at Private University (2014–2020) and KAKENHI No. 26630137, and the National Research Foundation (NRF), Prime Minister's Office, Singapore, under its Competitive Research Programme (CRP Award No. NRFCRP12-2013-01). H.Y. thanks the Singapore Spintronics Consortium (SG-SPIN) for support. A.M. acknowledges support from the King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Physical Society (APS)
JournalPhysical Review B