Spin-Orbit Torques in Co/Pd Multilayer Nanowires

Mahdi Jamali, Kulothungasagaran Narayanapillai, Xuepeng Qiu, Li Ming Loong, Aurelien Manchon, Hyunsoo Yang

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112 Scopus citations

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.
Original languageEnglish (US)
JournalPhysical Review Letters
Volume111
Issue number24
DOIs
StatePublished - Dec 9 2013

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