Magnetic oscillations driven by the spin Hall effect in 3-terminal   magnetic tunnel junction devices
  We show that direct current in a tantalum microstrip can induce steady-state magnetic oscillations in an adjacent nanomagnet through spin torque from the spin Hall effect (SHE). The oscillations are detected electrically via a magnetic tunnel junction (MTJ) contacting the nanomagnet. The oscillation frequency can be controlled using the MTJ bias to tune the magnetic anisotropy. In this 3-terminal device the SHE torque and the MTJ bias therefore provide independent controls of the oscillation amplitude and frequency, enabling new approaches for developing tunable spin torque nano-oscillators. 
Luqiao Liu, Chi-Feng Pai, D. C. Ralph, R. A. Buhrman
cond-mat.mtrl-sci cond-mat.mes-hall