Kavli Affiliate: Daniel C. Ralph
| First 5 Authors: Michael Patton, Daniel A. Pharis, Gautam Gurung, Xiaoxi Huang, Gahee Noh
| Summary:
Unconventional spin-orbit torques arising from electric-field-generated spin
currents in anisotropic materials have promising potential for spintronic
applications, including for perpendicular magnetic switching in high-density
memory applications. Here we determine all the independent elements of the spin
torque conductivity tensor allowed by bulk crystal symmetries for the
tetragonal conductor IrO2, via measurements of conventional (in plane)
antidamping torques for IrO2 thin films in the high-symmetry (001) and (100)
orientations. We then test that rotational transformations of this same tensor
can predict both the conventional and unconventional anti-damping torques for
IrO2 thin films in the lower-symmetry (101), (110), and (111) orientations,
finding good agreement. The results confirm that spin-orbit torques from all
these orientations are consistent with the bulk symmetries of IrO2, and show
how simple measurements of conventional torques from high-symmetry orientations
of anisotropic thin films can provide an accurate prediction of the
unconventional torques from lower-symmetry orientations.
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