Zero-field dynamics stabilized by in-plane shape anisotropy in MgO-based spin-torque oscillators
Year: 2019
Type: article
Abstract: Here, we demonstrate numerically that shape anisotropy in MgO-based spin-torque nano-oscillators consisting of an out-of-plane magnetized free layer and an in-plane polarizer is necessary to stabilize out-of-plane magnetization precession without the need of external magnetic fields. As the in-plane anisotropy is increased, a gradual tilting of the magnetization towards the in-plane easy direction is introduced, favouring zero-field dynamics over static in-plane states. Above a critical value, zero-field dynamics are no longer observed. The optimum ratio of in-plane shape to out-of-plane uniaxial anisotropy, for which large angle out-of-plane zero-field dynamics occur within the widest current range, is reported.
Source: Journal of Applied Physics
DOI: 10.1063/1.5081036
Authors: E. Kowalska, A. Kákay, C. Fowley, V. Sluka, J. Lindner, J. Fassbender, A. M. Deac
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Helmholtz Association
Award: G5160731076
OpenAlex ID: W2899312459