Merging droplets in double nano-contact spin torque oscillators

TL;DR

This paper uses micromagnetic simulations to study how magnetic droplet solitons nucleated by two nano-contact spin torque oscillators merge into a single larger droplet, revealing the dynamics, conditions, and hysteresis involved.

Contribution

It provides a detailed simulation-based analysis of droplet merging dynamics and identifies the critical separation and hysteretic behavior in double nano-contact spin torque oscillators.

Findings

Droplet pairs merge into a larger droplet when NC separation is below a critical value.

A transient breathing mode occurs during the merging process.

Merged droplets can break into pairs under high magnetic fields with hysteresis.

Abstract

We demonstrate how magnetic droplet soliton pairs, nucleated by two separated nano-contact (NC) spin torque oscillators, can merge into a single droplet soliton. A detailed description of the magnetization dynamics of this merger process is obtained by micromagnetic simulations: A droplet pair with a steady-state in-phase spin precession is generated through the spin-transfer torque effect underneath two separate NCs, followed by a gradual expansion of the droplets volume and the out phase of magnetization on the inner side of the two droplets, resulting in the droplets merging into a larger droplet. This merger occurs only when the NC separation is smaller than a critical value. A transient breathing mode is observed before the merged droplet stabilizes into a steady precession state. The precession frequency of the merged droplet is lower than that of the droplet pair, consistent with its larger size. Merged droplets can again break up into droplet pairs at high enough magnetic field with a strong hysteretic response.