Robust synchronization of an arbitrary number of spin-torque driven vortex nanooscillators

TL;DR

This paper demonstrates a robust method for synchronizing multiple spin-torque nanooscillators using magnetodipolar interactions, achieving stable synchronization even with variable contact sizes, advancing the control of nano-scale magnetic devices.

Contribution

It introduces a system enabling easy and stable synchronization of any number of vortex-based STNOs through magnetodipolar coupling, regardless of contact size variations.

Findings

Synchronization is highly dynamically stable due to large coupling energy.

Robust synchronization achieved in 1D and 2D arrangements.

Effective even with broad nanocontact size distribution.

Abstract

Non-linear magnetization dynamics in ferromagnetic nanoelements excited by the spin-polarized dc-current is one of the most intensively studied phenomena in solid state magnetism. Despite immense efforts, synchronization of oscillations induced in several such nanoelements (spin-torque driven nanooscillators, or STNO) still represents a major challenge both from the fundamental and technological points of view. In this paper we propose a system where synchronization of any number of STNOs, represented by magnetization vortices inside squared nanoelements, can be easily achieved. Using full-scale micromagnetic simulations we show that synchronization of these STNOs is extremely dynamically stable due to their very large coupling energy provided by the magnetodipolar interaction. Finally, we demonstrate that our concept allows robust synchronization of an arbitrary number of STNOs (arranged either as a 1D chain or as a 2D array), even when current supplying nanocontacts have a broad size distribution.