Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.246602
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Funding
- Singapore National Research Foundation under CRP [NRF-CRP 4-2008-06]
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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 10(8) A/cm(2) for the in-plane and perpendicular components, respectively, which is surprisingly comparable to previous studies in ultrathin (similar to 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.
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