AVS 50th International Symposium
    Magnetic Interfaces and Nanostructures Wednesday Sessions
       Session MI-WeM

Paper MI-WeM2
Dynamical Modes of Nanomagnets Driven by a Spin-Polarized Current

Wednesday, November 5, 2003, 8:40 am, Room 316

Session: Current-Induced Magnetic Switching and Excitations
Presenter: J.C. Sankey, Cornell University
Authors: S.I. Kiselev, Cornell University
J.C. Sankey, Cornell University
I.N. Krivorotov, Cornell University
N.C. Emley, Cornell University
S.E. Russek, National Institute of Standards and Technology
R.J. Schoelkopf, Yale University
R.A. Buhrman, Cornell University
D.C. Ralph, Cornell University
Correspondent: Click to Email
A spin-polarized current can apply a torque directly to a ferromagnet through transfer of angular momentum. Here we report direct electrical measurements of microwave-frequency magnetic dynamics driven by DC spin-transfer currents in Co/Cu/Co nanopillar structures. We demonstrate that spin-transfer can produce several types of excitations, including small angle elliptical precession, more complicated large angle motions and high current static state. Microwave power emitted by magnetic multilayer devices may enable nanoscale oscillators and microwave sources generated by DC current.