Spin-Orbit Torques in Co/Pd Multilayer Nanowires

Abstract
Current induced spin-orbit torques have been studied in ferromagnetic nanowires made of 20 nm thick Co/Pd multilayers with perpendicular magnetic anisotropy. Using Hall voltage and lock-in measurements, it is found that upon injection of an electric current both in-plane (Slonczewski-like) and perpendicular (fieldlike) torques build up in the nanowire. The torque efficiencies are found to be as large as 1.17 and 5 kOe at 108 A/cm2 for the in-plane and perpendicular components, respectively, which is surprisingly comparable to previous studies in ultrathin (∼1 nm) magnetic bilayers. We show that this result cannot be explained solely by spin Hall effect induced torque at the outer interfaces, indicating a probable contribution of the bulk of the Co/Pd multilayer.

Citation
Spin-Orbit Torques in Co/Pd Multilayer Nanowires 2013, 111 (24) Physical Review Letters

Publisher
American Physical Society (APS)

Journal
Physical Review Letters

DOI
10.1103/PhysRevLett.111.246602

PubMed ID
24483683

arXiv
1311.3033

Additional Links
http://link.aps.org/doi/10.1103/PhysRevLett.111.246602http://arxiv.org/abs/1311.3033

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