  Efficient generation of spin-orbit torques (SOTs) is central for the exciting
field of spin-orbitronics. Platinum, the archetypal spin Hall material, has the
potential to be an outstanding provider for spin-orbit torques due to its giant
spin Hall conductivity, low resistivity, high stabilities, and the ability to
be compatible with CMOS circuits. However, pure clean-limit Pt with low
resistivity still provides a low damping-like spin-orbit torque efficiency,
which limits its practical applications. The efficiency of spin-orbit torque in
Pt-based magnetic heterostructures can be improved considerably by increasing
the spin Hall ratio of Pt and spin transmissivity of the interfaces. Here we
reviews recent advances in understanding the physics of spin current
generation, interfacial spin transport, and the metrology of spin-orbit
torques, and summarize progress towards the goal of Pt-based spin-orbit torque
memories and logic that are fast, efficient, reliable, scalable, and
non-volatile.
