Synchronization of an Antiferromagnetic Josephson-like Oscillator with an External AC Signal

Authors D.V. Slobodianiuk , O.V. Prokopenko

Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska St., 01601 Kyiv, Ukraine

Issue Volume 12, Year 2020, Number 5
Dates Received 22 April 2020; revised manuscript received 15 October 2020; published online 25 October 2020
Citation D.V. Slobodianiuk, O.V. Prokopenko, J. Nano- Electron. Phys. 12 No 5, 05013 (2020)
PACS Number(s) 75.50.Ee, 05.45.Xt
Keywords Antiferromagnet (2) , Oscillator (3) , Synchronization, Nonlinearity.

Magnetization dynamics in a highly nonlinear antiferromagnetic Josephson-like spintronic oscillator under the action of DC and AC signals is studied theoretically and numerically, and the regime of the oscillator synchronization to an external AC signal has been found and investigated. We revealed that the synchronization bandwidth of the oscillator substantially depends not only on the external force amplitude which is typical, but also on the oscillator nonlinearity. This behavior arises from the highly nonlinear nature of the considered system. Our theoretical and numerical analyses show that the generation frequency of the oscillator depends on the applied electric DC current in a nonlinear way. Thus, the correct choice of the working point characterized by some particular value of the nonlinearity coefficient is important for the considered system to work properly, and it can be used for maximizing the oscillator synchronization bandwidth. Obtained results are important for the further development of antiferromagnetic terahertz-frequency spintronic oscillators and their applications. The developed formalism and numerical simulations can also be used for the description of strongly nonlinear non-isochronous oscillators of any nature.

List of References