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Spin-torque effects in antiferromagnetic (AFM) materials are of greatinterest due to the possible applications as high-speed spintronic devices. Inthe present paper we analyze the statistical properties of the current-drivenAFM nanooscillator that result from the white Gaussian noise of magneticnature. According to the peculiarities of deterministic dynamics, we derive theLangevin and Fokker-Planck equations in the energy representation of two normalmodes. We find the stationary distribution function in the subcritical andovercritical regimes and calculate the current dependence of the averageenergy, energy fluctuation and their ratio (quality factor). The noncriticalmode shows the Boltzmann statistics with the current-dependent effectivetemperature in the whole range of the current values. The effective temperatureof the other, i.e., soft, mode critically depends on the current in thesubcritical region. Distribution function of the soft mode follows the Gaussianlaw above the generation threshold. In the overcritical regime, the totalaverage energy and the quality factor grow with the current value. This raisesthe AFM nanooscillators to the promising candidates for active spintroniccomponents.

Spin torque antiferromagnetic nanooscillator in the presence of magnetic noise