Magnetic Oscillations Driven by the Spin Hall Effect in 3-Terminal Magnetic Tunnel Junction Devices

Luqiao Liu, Chi-Feng Pai, D. C. Ralph, and R. A. Buhrman
Phys. Rev. Lett. 109, 186602 – Published 31 October 2012

Abstract

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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  • Received 3 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.186602

© 2012 American Physical Society

Authors & Affiliations

Luqiao Liu1, Chi-Feng Pai1, D. C. Ralph1,2, and R. A. Buhrman1

  • 1Cornell University, Ithaca, New York 14853, USA
  • 2Kavli Institute at Cornell, Ithaca, New York 14853, USA

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Issue

Vol. 109, Iss. 18 — 2 November 2012

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