Journal
PHYSICAL REVIEW B
Volume 94, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.140414
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Funding
- ONR
- NSF/MRSEC through the Cornell Center for Materials Research (CCMR) [DMR-1120296]
- NSF through use of the Cornell Nanofabrication Facility (CNF)/NINN [ECCS-1542081]
- CCMR facilities
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We report measurements of the thickness and temperature (T) dependencies of current-induced spin-orbit torques, especially the fieldlike (FL) component, in various heavy metal (HM)/normal metal (NM) spacer/ferromagnet (FM)/oxide (MgO and HfOx/MgO) heterostructures. The FL torque in these samples originates from spin current generated by the spin Hall effect in the HM. For a FM layer sufficiently thin that a substantial portion of this spin current can reach the FM/oxide interface, T-dependent spin scattering there can yield a strong FL torque that is, in some cases, opposite in sign to that exerted at the NM/FM interface.
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