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Phys Rev Lett. 2012 Nov 2;109(18):186602. Epub 2012 Oct 31.

Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices.

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Cornell University, Ithaca, New York 14853, USA.


We show that a 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.

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