Non-linear frequency and amplitude modulation of a nano-contact spin torque oscillator
Abstract
We study the current controlled modulation of a nano-contact spin torque oscillator. Three principally different cases of frequency non-linearity (d2f/dI2dc being zero, positive, and negative) are investigated. Standard non-linear frequency modulation theory is able to accurately describe the frequency shifts during modulation. However, the power of the modulated sidebands only agrees with calculations based on a recent theory of combined non-linear frequency and amplitude modulation.
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