2013

Spin-orbit torques in Co/Pd multilayer nanowires

Spin-orbit torques in Co/Pd multilayer nanowires
M. Jamali, K. Narayanapillai, X. Qiu, A. Manchon, H. Yang
Phys. Rev. Lett. 111, 246602 (2013)​​​
M. Jamali, K. Narayanapillai, X. Qiu, L.M. Loong, A. Manchon, H. Yang
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2013
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 108A/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.