Spin-orbit torques in Co/Pd multilayer nanowires.
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/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.
Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576 Singapore, Singapore.
Mahdi
M
Jamali
Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576 Singapore, Singapore.
Kulothungasagaran
K
Narayanapillai
Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576 Singapore, Singapore.
Xuepeng
X
Qiu
Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576 Singapore, Singapore.
Li Ming
LM
Loong
Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
Aurelien
A
Manchon
Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, 117576 Singapore, Singapore.
Hyunsoo
H
Yang