Merging droplets in double nano-contact spin torque oscillators
arXiv:1603.04133 · doi:10.1103/PhysRevB.93.094431
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.
arXiv commentaccepted by Physical Review B
References in corpus (12)
- The design and verification of Mumax3
- Magnetic vortex oscillator driven by dc spin-polarized current
- Electrical switching of vortex core in a magnetic disk
- Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
- Theory for a dissipative droplet soliton excited by a spin torque nanocontact
- Current-induced magnetic vortex core switching in a Permalloy nanodisk
- Evolution and stability of a magnetic vortex in small cylindrical ferromagnetic particle under applied field
- Stable Magnetic Droplet Solitons in Spin Transfer Nanocontacts
- Skyrmion in a real magnetic film
- Confined dissipative droplet solitons in spin-valve nanowires with perpendicular magnetic anisotropy
- Propagation and control of nano-scale, magnetic droplet solitons
- Observation of droplet soliton drift resonances in a spin-transfer-torque nanocontact to a ferromagnetic thin film