Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

D.C. Ralph; G. Finocchio; I.N. Krivorotov; J.C. Sankey; K.V. Thadani; O. Ozatay; R.A. Buhrman; Y.-T. Cui; Z.-P. Li

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Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

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arxiv 0803.2871 v1 pith:6FYLIC52 submitted 2008-03-19 cond-mat.other cond-mat.mtrl-sci

Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

K.V. Thadani , G. Finocchio , Z.-P. Li , O. Ozatay , J.C. Sankey , I.N. Krivorotov , Y.-T. Cui , R.A. Buhrman

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D.C. Ralph

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classification cond-mat.other cond-mat.mtrl-sci

keywords magneticfieldangleaxisfunctionin-planelinewidthsignals

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We measure the microwave signals produced by spin-torque-driven magnetization dynamics in patterned magnetic multilayer devices at room temperature, as a function of the angle of a magnetic field applied in the sample plane. We find strong variations in the frequency linewidth of the signals, with a decrease by more than a factor of 20 as the field is rotated from the magnetic easy axis to the in-plane hard axis. Based on micromagnetic simulations, we identify these variations as due to a transition from spatially incoherent to coherent precession.

Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

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