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We measure the microwave signals produced by spin-torque-driven magnetizationdynamics in patterned magnetic multilayer devices at room temperature, as afunction of the angle of a magnetic field applied in the sample plane. We findstrong variations in the frequency linewidth of the signals, with a decrease bymore than a factor of 20 as the field is rotated from the magnetic easy axis tothe in-plane hard axis. Based on micromagnetic simulations, we identify thesevariations as due to a transition from spatially incoherent to coherentprecession.

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