Designing Magnetic Droplet Soliton Nucleation Employing Spin Polarizer
arXiv:1709.10325 · doi:10.1088/1361-6528/aaac11
Abstract
We show by means of micromagnetic simulations that spin polarizer in nano-contact spin torque oscillators (NC-STOs) as the representative of the fixed layer in an orthogonal pseudo-spin valve (P-SV) can be employed to design and to control magnetic droplet soliton nucleation and dynamics. We found that using a tilted spin polarizer layer decreases the droplet nucleation time which is more suitable for high speed applications. However, a tilted spin polarizer increases the nucleation current and decreases the frequency stability of the droplet. Additionally, by driving the magnetization inhomogenously at the nano-contact region, it is found that a tilted spin polarizer reduces the precession angle of the droplet and through an interplay with the Oersted field of the DC current, it breaks the spatial symmetry of the droplet profile. Our findings explore fundamental insight into nano-scale magnetic droplet soliton dynamics with potential tunability parameters for future microwave electronics.
10 pages, 6 figures
References in corpus (9)
- Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
- Theory for a dissipative droplet soliton excited by a spin torque nanocontact
- Stable Magnetic Droplet Solitons in Spin Transfer Nanocontacts
- Direct observation and imaging of a spin-wave soliton with like symmetry
- Direct Observation of Large Amplitude Spin Excitations Localized in a Spin-Transfer Nanocontact
- Excitation of self-localized spin-wave "bullets" by spin-polarized current in in-plane magnetized magnetic nano-contacts: a micromagnetic study
- Perturbation Theory for Propagating Magnetic Droplet Solitons
- Direct observation of magnetic droplet solitons in all-perpendicular spin torque nano-oscillators
- Current induced multi-mode propagating spin waves in a spin transfer torque nano-contact with strong perpendicular magnetic anisotropy